What are the cheapest airlines flying from Seattle to Washington, D.C. round-trip?

Our cheapest airline available from Seattle to Washington, D.C. is Spirit Airlines. Our recent data shows that you can find tickets from as low as $232 on this airline. Additional options worth looking into are Delta and Frontier, starting at $233 and $242 round-trip. Spirit Airlines is currently priced 42% below the average price you’ll pay for this route.

What are the cheapest airlines to fly from Seattle to Washington, D.C. one-way?

The cheapest airline one-way is Spirit Airlines, with whom users have recently found tickets for as low as $81. However, be on the lookout for offers from Frontier and Delta, as they are both options that can get you from Seattle to Washington, D.C. for a low price.

What are the most popular routes from Seattle to Washington, D.C.?

The most popular flight routes from Seattle to Washington, D.C. are Seattle/Tacoma Intl - Washington, D.C. Reagan-National, Seattle/Tacoma Intl - Washington, D.C. Dulles Intl and Seattle/Tacoma Intl - Baltimore/Washington.

What are the cheapest flights from Seattle to Washington, D.C.?

While on average a flight from Seattle to Washington, D.C. is generally $895, our data shows the cheapest flight currently is $143. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), you can expect to pay $216 for that flight.

What are the most reliable airlines from Seattle to Washington, D.C.?

No one likes to see their flight delayed. When booking a flight from Seattle to Washington, D.C. consider choosing Avianca (87%), Brussels Airlines (87%) or Ethiopian Air (85%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Seattle to Washington, D.C.?

American Airlines, Alaska Airlines and Delta are the most popular airlines when flying from Seattle to Washington, D.C..

Where are the most common layover locations when flying from Seattle to Washington, D.C.?

Flights departing from Seattle and landing in Washington, D.C. layover in Chicago most frequently.

Where are the least popular layover locations for Seattle to Washington, D.C. flights?

Of the flights from Seattle to Washington, D.C. that have layovers, the fewest flights stop in Denver.

What are some popular things to do or see while on a layover in Chicago?

Magnificent Mile, Grant Park, and River North are the most popular attractions in Chicago if you're in need of something to do during your layover. Magnificent Mile, Grant Park, and River North can be visited by traveling about 15.5 mi, 16.2 mi, and 15.0 mi respectively from Chicago O'Hare Intl. Those on a layover in Chicago in need of a rental car can book one at Chicago O'Hare Intl for about $49.

What is the cheapest day to fly round-trip from Seattle to Washington, D.C.?

Wednesday is generally a great day to depart. Flying on this day could help you save up to 24%.

How far in advance should I book a flight from Seattle to Washington, D.C.?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 42 days in advance, which can save you up to 82% on flights from Seattle to Washington, D.C. compared to booking the week you need them. Waiting 42 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $466. For sooner than that we have options available in the next 3 days from $590.

What is the cheapest month to fly from Seattle to Washington, D.C.?

September is one of the best times of the year to fly to Washington, D.C. from Seattle. Prices for September average $407 per person but you can even find prices for as low as $180. The most expensive prices can be found in the month of December. Opting for a September flight can save you 28% on your journey compared to booking in December

Most accurate provider : When it comes to deals on Seattle-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Washington, D.C. flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Seattle-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly from for flights from Seattle to Washington, D.C.?

Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly out of when you book flights from Seattle to Washington, D.C.. 8 airlines have flights from Seattle/Tacoma Intl to Washington, D.C. on a regular basis. Booking flights from Seattle/Tacoma Intl to Washington, D.C. should not be difficult; the airport handles an average of 18 outbound flights to Washington, D.C. per day.

Can I find deals for flights from Seattle to Washington, D.C. that include hotel bookings?

Yes. In addition to deals on Seattle to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Seattle to Washington, D.C.?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Washington, D.C..

Can I find deals for business class flights from Seattle to Washington, D.C.?

Yes. Cheapflights offers flight deals from Seattle to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$81+ Flights from Seattle to Washington, D.C.

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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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3. Compare prices and book

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The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in September or October, booked 41 days in advance, depart on a Thursday or Tuesday and return on a Tuesday

Cheap flight deals from Seattle to Washington, D.C.

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$232 (FlightHub)
One-way from	$81 (Kiwi.com)
Popular in	December
Cheapest in	September
Average price	$376
Good round-trip deal	$347 or less
Good one-way deal	$188 or less

Provider with most accurate pricing for Seattle/Tacoma Intl-Washington, D.C. (WAS) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Washington, D.C. (WAS) flights.

Search Deals

From Seattle/Tacoma Intl to Washington, D.C. (WAS)

Search Deals

One-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS)

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($25 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 2025

Search Deals

Price to beat on a round-trip flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).

Search Deals

Price to beat on a one-way flight from Seattle/Tacoma Intl to Washington, D.C. (WAS).

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Find flight deals from Seattle to Washington, D.C.

Cheapest flights from Seattle to Washington, D.C.
Explore the most affordable flight options available from Seattle to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 5, 2025.

Tue 3/1812:41 pmSEA - BWI

1 stop13h 29mSpirit Airlines

Tue 3/253:13 pmBWI - SEA

2 stops20h 30mSpirit Airlines

Deal found 3/3

$232

Tue 5/139:30 pmSEA - BWI

1 stop8h 40mDelta

Sat 5/176:07 pmBWI - SEA

1 stop7h 14mDelta

Deal found 3/4

$233

Thu 3/209:48 amSEA - BWI

1 stop16h 37mMultiple Airlines

Sun 3/238:55 pmBWI - SEA

1 stop15h 34mMultiple Airlines

Deal found 3/4

$236

Thu 3/272:02 pmSEA - BWI

1 stop18h 28mFrontier

Wed 4/25:18 pmBWI - SEA

1 stop21h 38mFrontier

Deal found 3/5

$242

Mon 3/1712:59 amSEA - BWI

1 stop10h 24mAmerican Airlines

Tue 4/11:59 pmBWI - SEA

1 stop9h 57mAmerican Airlines

Deal found 3/4

$252

Tue 3/259:58 amSEA - BWI

Nonstop5h 05mHawaiian Airlines

Tue 4/87:03 pmBWI - SEA

Nonstop5h 57mHawaiian Airlines

Deal found 3/3

$257

Wed 5/216:00 amSEA - DCA

1 stop12h 59mMultiple Airlines

Wed 5/288:35 amDCA - SEA

1 stop11h 13mMultiple Airlines

Deal found 3/4

$264

Tue 3/2511:48 pmSEA - DCA

1 stop11h 10mJetBlue

Tue 4/13:45 pmDCA - SEA

1 stop9h 42mJetBlue

Deal found 3/4

$269

Mon 4/143:58 pmSEA - IAD

1 stop10h 42mMultiple Airlines

Fri 5/28:01 amIAD - SEA

1 stop12h 59mMultiple Airlines

Deal found 3/3

$269

Thu 3/202:02 pmSEA - DCA

1 stop28h 57mFrontier

Sun 3/231:03 pmDCA - SEA

1 stop25h 59mFrontier

Deal found 3/4

$270

Tue 4/291:50 pmSEA - DCA

Nonstop5h 09mAlaska Airlines

Wed 4/305:38 pmDCA - SEA

Nonstop5h 57mAlaska Airlines

Deal found 3/5

$275

Tue 4/2910:06 amSEA - IAD

Nonstop5h 07mAlaska Airlines

Wed 4/3010:00 amIAD - SEA

Nonstop5h 40mAlaska Airlines

Deal found 3/5

$275

Best flights from Seattle to Washington, D.C.
Discover carefully curated flight deals from Seattle to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 5, 2025.

Tue 3/1812:41 pmSEA - BWI

1 stop13h 29mSpirit Airlines

Tue 3/253:13 pmBWI - SEA

2 stops20h 30mSpirit Airlines

Deal found 3/3

$232

Tue 5/139:30 pmSEA - BWI

1 stop8h 40mDelta

Sat 5/176:07 pmBWI - SEA

1 stop7h 14mDelta

Deal found 3/4

$233

Thu 3/209:48 amSEA - BWI

1 stop16h 37mMultiple Airlines

Sun 3/238:55 pmBWI - SEA

1 stop15h 34mMultiple Airlines

Deal found 3/4

$236

Thu 3/272:02 pmSEA - BWI

1 stop18h 28mFrontier

Wed 4/25:18 pmBWI - SEA

1 stop21h 38mFrontier

Deal found 3/5

$242

Mon 3/1712:59 amSEA - BWI

1 stop10h 24mAmerican Airlines

Tue 4/11:59 pmBWI - SEA

1 stop9h 57mAmerican Airlines

Deal found 3/4

$252

Tue 3/259:58 amSEA - BWI

Nonstop5h 05mHawaiian Airlines

Tue 4/87:03 pmBWI - SEA

Nonstop5h 57mHawaiian Airlines

Deal found 3/3

$257

Tue 3/2511:48 pmSEA - DCA

1 stop11h 10mJetBlue

Tue 4/13:45 pmDCA - SEA

1 stop9h 42mJetBlue

Deal found 3/4

$269

Tue 4/291:50 pmSEA - DCA

Nonstop5h 09mAlaska Airlines

Wed 4/305:38 pmDCA - SEA

Nonstop5h 57mAlaska Airlines

Deal found 3/5

$275

Wed 3/267:05 amSEA - IAD

1 stop10h 58mUnited Airlines

Fri 4/48:40 amIAD - SEA

Nonstop5h 52mUnited Airlines

Deal found 3/4

$293

Wed 4/25:15 amSEA - DCA

2 stops9h 30mSouthwest

Mon 4/73:30 pmDCA - SEA

2 stops12h 00mSouthwest

Deal found 3/4

$317

Thu 4/176:33 pmSEA - IAD

1 stop13h 57mSun Country Air

Sun 4/207:30 amIAD - SEA

1 stop12h 55mSun Country Air

Deal found 3/3

$341

Wed 5/216:00 amSEA - DCA

1 stop12h 59mMultiple Airlines

Wed 5/288:35 amDCA - SEA

1 stop11h 13mMultiple Airlines

Deal found 3/4

$264

Last-minute flights from Seattle to Washington, D.C.
Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated March 5, 2025 and is based on user searches.

Tue 3/1112:41 pmSEA - BWI

2 stops22h 37mSpirit Airlines

Tue 3/183:13 pmBWI - SEA

2 stops20h 30mSpirit Airlines

Deal found 3/4

$235

Tue 3/1112:59 amSEA - BWI

1 stop10h 24mAmerican Airlines

Wed 3/265:00 amBWI - SEA

1 stop10h 50mAmerican Airlines

Deal found 3/4

$412

Wed 3/1211:55 amSEA - IAD

1 stop7h 19mAmerican Airlines

Wed 3/265:20 pmIAD - SEA

1 stop8h 49mAmerican Airlines

Deal found 3/4

$462

Wed 3/1210:02 amSEA - BWI

Nonstop4h 54mAlaska Airlines

Wed 3/267:03 pmBWI - SEA

Nonstop5h 57mAlaska Airlines

Deal found 3/4

$463

Wed 3/1212:59 amSEA - DCA

1 stop8h 16mAmerican Airlines

Thu 3/204:12 pmDCA - SEA

1 stop8h 53mAmerican Airlines

Deal found 3/5

$466

Thu 3/132:02 pmSEA - BWI

1 stop18h 28mMultiple Airlines

Mon 3/243:13 pmBWI - SEA

2 stops20h 30mMultiple Airlines

Deal found 3/3

$302

Thu 3/132:02 pmSEA - BWI

1 stop18h 28mFrontier

Sun 3/168:53 pmBWI - SEA

1 stop15h 36mFrontier

Deal found 3/3

$350

Thu 3/1312:00 pmSEA - BWI

1 stop8h 53mDelta

Mon 3/244:45 pmBWI - SEA

1 stop10h 11mDelta

Deal found 3/3

$423

Thu 3/1311:48 pmSEA - DCA

1 stop11h 10mJetBlue

Thu 3/203:50 pmDCA - SEA

1 stop9h 48mJetBlue

Deal found 3/4

$429

Thu 3/132:05 pmSEA - DCA

Nonstop4h 54mMultiple Airlines

Mon 3/247:00 amDCA - SEA

1 stop8h 02mMultiple Airlines

Deal found 3/4

$445

Fri 3/142:02 pmSEA - DCA

1 stop23h 57mFrontier

Mon 3/247:00 amDCA - SEA

1 stop8h 02mFrontier

Deal found 3/4

$270

Sat 3/155:30 pmSEA - BWI

1 stop9h 20mSouthwest

Thu 4/33:10 pmBWI - SEA

2 stops12h 20mSouthwest

Deal found 3/4

$462

One-way flights from Seattle to Washington, D.C.
Search for one-way flight options from Seattle to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated March 5, 2025.

Sat 5/104:58 pmSEA - BWI

1 stop10h 00mSpirit Airlines

Deal found 3/5

$81

Mon 4/286:00 amSEA - BWI

1 stop7h 58mFrontier

Deal found 3/5

$94

Fri 5/26:59 pmSEA - BWI

1 stop7h 51mDelta

Deal found 3/5

$104

Wed 5/76:00 amSEA - BWI

2 stops8h 25mSouthwest

Deal found 3/5

$109

Wed 4/239:40 pmSEA - BWI

Nonstop5h 06mAlaska Airlines

Deal found 3/5

$129

Sat 4/125:15 amSEA - BWI

1 stop9h 17mUnited Airlines

Deal found 3/5

$139

Thu 4/37:23 amSEA - DCA

Nonstop5h 06mDelta

Deal found 3/5

$144

Wed 4/2310:30 pmSEA - IAD

Nonstop4h 50mDelta

Deal found 3/5

$144

Sun 4/206:31 pmSEA - IAD

1 stop13h 12mSun Country Air

Deal found 3/4

$145

Sat 5/316:00 amSEA - DCA

1 stop27h 00mFrontier

Deal found 3/5

$151

Wed 4/166:39 amSEA - DCA

1 stop8h 19mAlaska Airlines

Deal found 3/4

$153

Sat 5/33:36 pmSEA - IAD

1 stop11h 04mAlaska Airlines

Deal found 3/5

$153

Find flights from Seattle to Washington, D.C. within your budget

Fly from

Fly to

Route

Depart

Return

Price

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 3/18

12:41 pm-5:10 am

1 stop13h 29m

Baltimore/Washington

Tue 3/25

3:13 pm-8:43 am

2 stops20h 30m

$232

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 5/13

9:30 pm-9:10 am

1 stop8h 40m

Baltimore/Washington

Sat 5/17

6:07 pm-10:21 pm

1 stop7h 14m

$233

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 3/20

9:48 am-5:25 am

1 stop16h 37m

Baltimore/Washington

Sun 3/23

8:55 pm-9:29 am

1 stop15h 34m

$236

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 3/27

2:02 pm-11:30 am

1 stop18h 28m

Baltimore/Washington

Wed 4/2

5:18 pm-11:56 am

1 stop21h 38m

$242

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 3/17

12:59 am-2:23 pm

1 stop10h 24m

Baltimore/Washington

Tue 4/1

1:59 pm-8:56 pm

1 stop9h 57m

$252

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Tue 3/25

9:58 am-6:03 pm

Nonstop5h 05m

Baltimore/Washington

Tue 4/8

7:03 pm-10:00 pm

Nonstop5h 57m

$257

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Wed 5/21

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Wed 5/28

8:35 am-4:48 pm

1 stop11h 13m

$264

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 3/25

11:48 pm-1:58 pm

1 stop11h 10m

Washington, D.C. Reagan-National

Tue 4/1

3:45 pm-10:27 pm

1 stop9h 42m

$269

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 4/14

3:58 pm-5:40 am

1 stop10h 42m

Washington, D.C. Dulles Intl

Fri 5/2

8:01 am-6:00 pm

1 stop12h 59m

$269

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Thu 3/20

2:02 pm-9:59 pm

1 stop28h 57m

Washington, D.C. Reagan-National

Sun 3/23

1:03 pm-12:02 pm

1 stop25h 59m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/5

Showing 1-10 of 54 results

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Compare providers for flights from Seattle to Washington, D.C.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Washington, D.C. in March.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
Mytrip	Price Accuracy3 stars	Trust Score*3 stars
Kiwi.com	Price Accuracy3 stars	Trust Score*2 stars
Gotogate	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*1 star
CheapTicketsDeal	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Seattle-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Washington, D.C. flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Seattle-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Seattle to Washington, D.C. flights

Find out what our experts recommend to make the most of your Seattle to Washington, D.C. trip

Airlines

Alaska Airlines

Alaska's Premium Class offers extra legroom and free cocktails, ideal for comfort on medium-haul flights.

Alaska's Wi-Fi is a flat fee, perfect for business travelers needing connectivity on longer flights.

Read more about Alaska Airlinesby Robert Schrader

United Airlines

United's Economy Plus offers extra legroom, ideal for added comfort on medium-haul flights.

United's Polaris Lounges offer exclusive amenities like showers and dining for premium passengers.

Read more about United Airlinesby Harriet Baskas

Airports

SEA

Plan to arrive at SEA at least two hours before your flight. Use SEA Spot Saver for security appointments to reduce wait times.

IAD

Use the Silver Line Metro for a cheap ride to D.C. from IAD, taking less than 40 minutes to reach the city.

Our travel experts

Robert Schrader

Expert on Alaska Airlines

Harriet Baskas

Expert on United Airlines

Ramsey Qubein

Expert on IAD

Brandon Schultz

Expert on SEA

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.

Best time to book a flight from Seattle to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Seattle with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Seattle to Washington, D.C.

Get recent, data-driven insights about flights from Seattle to Washington, D.C. including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Seattle to Washington, D.C.?

The price you pay for your flight from Seattle to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 41 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Washington, D.C.?

Currently, August is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of $309). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of $388). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to WAS?

When flying from Seattle to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 30% versus a flight at noon.

What is the cheapest day to fly from Seattle to Washington, D.C.?

Travelers seeking maximum savings on their Seattle to Washington, D.C. flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Washington, D.C. by month

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

Temperature in Washington, D.C. by month

If weather is an important factor for your trip to Washington, D.C., use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing Washington, D.C.

See what other customers who have flown with Southwest, Alaska Airlines and Delta from Seattle to Washington, D.C. have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.1

Very good

4,321 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest

8.1

Very good

4,321 reviews

Southwest

8.1

Very good

4,321 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Alaska Airlines

8.0

Very good

9,711 reviews

Southwest

8.1

Very good

4,321 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta

8.0

Very good

8,044 reviews

Southwest

8.1

Very good

4,321 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Hawaiian Airlines

7.9

Good

2,318 reviews

Southwest

8.1

Very good

4,321 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines

7.4

Good

8,655 reviews

Southwest

8.1

Very good

4,321 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

What airport do you fly from for flights from Seattle to Washington, D.C.?
Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly out of when you book flights from Seattle to Washington, D.C.. 8 airlines have flights from Seattle/Tacoma Intl to Washington, D.C. on a regular basis. Booking flights from Seattle/Tacoma Intl to Washington, D.C. should not be difficult; the airport handles an average of 18 outbound flights to Washington, D.C. per day.
What are the cheapest airlines flying from Seattle to Washington, D.C. round-trip?
Our cheapest airline available from Seattle to Washington, D.C. is Spirit Airlines. Our recent data shows that you can find tickets from as low as $232 on this airline. Additional options worth looking into are Delta and Frontier, starting at $233 and $242 round-trip. Spirit Airlines is currently priced 42% below the average price you’ll pay for this route.
What are the cheapest airlines to fly from Seattle to Washington, D.C. one-way?
The cheapest airline one-way is Spirit Airlines, with whom users have recently found tickets for as low as $81. However, be on the lookout for offers from Frontier and Delta, as they are both options that can get you from Seattle to Washington, D.C. for a low price.
What are the most popular routes from Seattle to Washington, D.C.?
The most popular flight routes from Seattle to Washington, D.C. are Seattle/Tacoma Intl - Washington, D.C. Reagan-National, Seattle/Tacoma Intl - Washington, D.C. Dulles Intl and Seattle/Tacoma Intl - Baltimore/Washington.
What are the most reliable airlines from Seattle to Washington, D.C.?
No one likes to see their flight delayed. When booking a flight from Seattle to Washington, D.C. consider choosing Avianca (87%), Brussels Airlines (87%) or Ethiopian Air (85%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Seattle to Washington, D.C.?
While on average a flight from Seattle to Washington, D.C. is generally $895, our data shows the cheapest flight currently is $143. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Reagan-National), you can expect to pay $216 for that flight.
Where are the most common layover locations when flying from Seattle to Washington, D.C.?
Flights departing from Seattle and landing in Washington, D.C. layover in Chicago most frequently.
What are some popular things to do or see while on a layover in Chicago?
Magnificent Mile, Grant Park, and River North are the most popular attractions in Chicago if you're in need of something to do during your layover. Magnificent Mile, Grant Park, and River North can be visited by traveling about 15.5 mi, 16.2 mi, and 15.0 mi respectively from Chicago O'Hare Intl. Those on a layover in Chicago in need of a rental car can book one at Chicago O'Hare Intl for about $49.
Where are the least popular layover locations for Seattle to Washington, D.C. flights?
Of the flights from Seattle to Washington, D.C. that have layovers, the fewest flights stop in Denver.
Can I find deals for flights from Seattle to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on Seattle to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Seattle to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Washington, D.C..
Can I find deals for business class flights from Seattle to Washington, D.C.?
Yes. Cheapflights offers flight deals from Seattle to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Seattle to Washington, D.C.?
Currently, August is the cheapest month in which you can book a flight from Seattle to Washington, D.C. (average of $309). Flying from Seattle to Washington, D.C. in June is currently the most expensive (average of $388). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 8 airlines flying from Seattle to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$86	Average$226	FlexibilityNo cancel fee	On-time62%
Sun Country Air	Cheapest$169	Average$534	FlexibilityNo cancel fee	On-time83%
Spirit Airlines	Cheapest$178	Average$267	FlexibilityNo cancel fee	On-time65%
Delta	Cheapest$196	Average$448	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$206	Average$469	FlexibilityNo cancel fee	On-time71%
Alaska Airlines	Cheapest$236	Average$512	FlexibilityNo cancel fee	On-time75%
United Airlines	Cheapest$249	Average$429	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$296	Average$494	FlexibilityNo cancel fee	On-time63%

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$81+ Cheap flights from Seattle (SEA) to Washington, D.C. (WAS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/10. Fares are subject to change and may not be available on all flights or dates of travel.

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The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in September or October, booked 41 days in advance, depart on a Thursday or Tuesday and return on a Tuesday

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Cheapest flights from Seattle to Washington, D.C.Explore the most affordable flight options available from Seattle to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 5, 2025.

Explore the most affordable flight options available from Seattle to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 5, 2025.

Find flights from Seattle to Washington, D.C. within your budget

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Best time to book a flight from Seattle to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Seattle with our price prediction graph.

Travel insights for flights from Seattle to Washington, D.C.

Get recent, data-driven insights about flights from Seattle to Washington, D.C. including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Seattle to Washington, D.C.?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Washington, D.C.. Price data was last updated on February 28, 2025.

What is the cheapest month to book a flight from Seattle to Washington, D.C.?

What is the cheapest time of day to fly from SEA to WAS?

Find hourly flight availability from Seattle to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 5, 2025.

What is the cheapest day to fly from Seattle to Washington, D.C.?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Washington, D.C.. Price data was last updated on March 2, 2025.

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

Reviews of airlines servicing Washington, D.C.

See what other customers who have flown with Southwest, Alaska Airlines and Delta from Seattle to Washington, D.C. have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Washington, D.C.. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Seattle to Washington, D.C.?

What are the cheapest airlines flying from Seattle to Washington, D.C. round-trip?

What are the cheapest airlines to fly from Seattle to Washington, D.C. one-way?

What are the most popular routes from Seattle to Washington, D.C.?

What are the most reliable airlines from Seattle to Washington, D.C.?

What are the cheapest flights from Seattle to Washington, D.C.?

Where are the most common layover locations when flying from Seattle to Washington, D.C.?

What are some popular things to do or see while on a layover in Chicago?

Where are the least popular layover locations for Seattle to Washington, D.C. flights?

Can I find deals for flights from Seattle to Washington, D.C. that include hotel bookings?

How can I find direct flights from Seattle to Washington, D.C.?

Can I find deals for business class flights from Seattle to Washington, D.C.?

What is the cheapest month to book a flight from Seattle to Washington, D.C.?

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Top 8 airlines flying from Seattle to Washington, D.C.

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Cheapest flights from Seattle to Washington, D.C.
Explore the most affordable flight options available from Seattle to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 5, 2025.