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 Frontier. Our recent data shows that you can find tickets from as low as $228 on this airline. Additional options worth looking into are Spirit Airlines and Hawaiian Airlines, starting at $249 and $251 round-trip. Frontier is currently priced 43% 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 Frontier, with whom users have recently found tickets for as low as $128. However, be on the lookout for offers from Spirit Airlines and Alaska Airlines, 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. Dulles Intl, Seattle/Tacoma Intl - Baltimore/Washington and Seattle/Tacoma Intl - Washington, D.C. Reagan-National.

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

While on average a flight from Seattle to Washington, D.C. is generally $729, our data shows the cheapest flight currently is $143. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $233 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 Ethiopian Air (93%), Lufthansa (92%) or Austrian Airlines (92%) 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 $55.

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 25%.

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 55 days in advance, which can save you up to 66% on flights from Seattle to Washington, D.C. compared to booking the week you need them. Waiting 55 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 $313. For sooner than that we have options available in the next 3 days from $552.

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 $402 per person but you can even find prices for as low as $203. The most expensive prices can be found in the month of December. Opting for a September flight can save you 27% 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 eDreams the most. eDreams 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.. 9 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 31 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.

$128+ Flights from Seattle to Washington, D.C. - Compare & Save Big

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Find cheap flights from Seattle to Washington, D.C. with Cheapflights

1. Tell us where you want to go

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

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in September or March, booked 90 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	eDreams 3 stars
Round-trip from	$226 (Trip.com)
One-way from	$128 (Cheapflightsfares)
Popular in	December
Cheapest in	September
Average price	$393
Good round-trip deal	$333 or less
Good one-way deal	$190 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 ($28 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 April 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).

Search Deals

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 April 25, 2025.

Tue 6/31:48 pmSEA - DCA

Nonstop5h 11mMultiple Airlines

Tue 6/107:00 amDCA - SEA

1 stop19h 37mMultiple Airlines

Deal found 4/23

$226

Mon 4/286:00 amSEA - DCA

1 stop27h 09mFrontier

Tue 4/296:00 pmDCA - SEA

1 stop9h 44mFrontier

Deal found 4/25

$228

Tue 5/274:00 pmSEA - IAD

Nonstop4h 59mMultiple Airlines

Thu 5/297:25 amIAD - SEA

1 stop9h 51mMultiple Airlines

Deal found 4/24

$233

Fri 5/166:52 pmSEA - IAD

1 stop8h 39mFrontier

Sun 5/257:25 amIAD - SEA

1 stop9h 51mFrontier

Deal found 4/24

$234

Wed 10/87:33 pmSEA - BWI

1 stop7h 29mDelta

Wed 10/156:10 pmBWI - SEA

1 stop9h 01mDelta

Deal found 4/25

$243

Sat 5/243:20 pmSEA - BWI

2 stops17h 26mMultiple Airlines

Sat 5/315:48 pmBWI - SEA

1 stop9h 49mMultiple Airlines

Deal found 4/25

$247

Thu 5/296:00 amSEA - BWI

1 stop21h 10mSpirit Airlines

Tue 6/32:59 pmBWI - SEA

2 stops26h 26mSpirit Airlines

Deal found 4/24

$249

Mon 5/266:25 amSEA - BWI

1 stop7h 03mFrontier

Sun 6/18:44 pmBWI - SEA

1 stop14h 40mFrontier

Deal found 4/24

$250

Wed 5/289:18 amSEA - IAD

Nonstop4h 57mHawaiian Airlines

Wed 5/286:15 pmIAD - SEA

Nonstop5h 45mHawaiian Airlines

Deal found 4/25

$251

Tue 9/1610:55 amSEA - BWI

1 stop7h 47mUnited Airlines

Tue 9/236:15 amBWI - SEA

2 stops10h 13mUnited Airlines

Deal found 4/24

$254

Sat 6/77:35 amSEA - DCA

Nonstop5h 14mDelta

Tue 6/104:40 pmDCA - SEA

Nonstop5h 58mDelta

Deal found 4/23

$257

Tue 6/34:00 pmSEA - IAD

Nonstop4h 59mAlaska Airlines

Wed 6/46:15 pmIAD - SEA

Nonstop5h 45mAlaska Airlines

Deal found 4/24

$257

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 April 25, 2025.

Tue 6/31:48 pmSEA - DCA

Nonstop5h 11mMultiple Airlines

Tue 6/107:00 amDCA - SEA

1 stop19h 37mMultiple Airlines

Deal found 4/23

$226

Mon 4/286:00 amSEA - DCA

1 stop27h 09mFrontier

Tue 4/296:00 pmDCA - SEA

1 stop9h 44mFrontier

Deal found 4/25

$228

Thu 5/296:00 amSEA - BWI

1 stop21h 10mSpirit Airlines

Tue 6/32:59 pmBWI - SEA

2 stops26h 26mSpirit Airlines

Deal found 4/24

$249

Wed 5/289:18 amSEA - IAD

Nonstop4h 57mHawaiian Airlines

Wed 5/286:15 pmIAD - SEA

Nonstop5h 45mHawaiian Airlines

Deal found 4/25

$251

Sat 6/77:35 amSEA - DCA

Nonstop5h 14mDelta

Tue 6/104:40 pmDCA - SEA

Nonstop5h 58mDelta

Deal found 4/25

$257

Tue 6/311:30 pmSEA - IAD

Nonstop5h 06mAlaska Airlines

Sat 6/77:00 amIAD - SEA

Nonstop5h 40mAlaska Airlines

Deal found 4/24

$257

Sat 5/315:20 amSEA - IAD

1 stop8h 36mAmerican Airlines

Sat 6/76:43 pmIAD - SEA

1 stop9h 01mAmerican Airlines

Deal found 4/24

$275

Sat 5/1712:45 pmSEA - IAD

1 stop9h 24mUnited Airlines

Sat 5/245:48 pmIAD - SEA

Nonstop5h 53mUnited Airlines

Deal found 4/24

$284

Thu 5/159:00 amSEA - IAD

1 stop24h 38mSun Country Air

Sun 8/1012:40 pmIAD - SEA

1 stop22h 22mSun Country Air

Deal found 4/24

$320

Wed 7/1610:40 pmSEA - DCA

1 stop8h 20mSouthwest

Tue 7/224:50 pmDCA - SEA

2 stops10h 25mSouthwest

Deal found 4/23

$362

Tue 7/89:50 pmSEA - DCA

1 stop9h 48mJetBlue

Sun 7/1312:40 pmDCA - SEA

1 stop12h 30mJetBlue

Deal found 4/24

$438

Tue 5/274:00 pmSEA - IAD

Nonstop4h 59mMultiple Airlines

Thu 5/297:25 amIAD - SEA

1 stop9h 51mMultiple Airlines

Deal found 4/24

$233

Last-minute flights from Seattle to Washington, D.C.
Discover last-minute flight deals from Seattle to Washington, D.C.. Data last updated April 25, 2025 and is based on user searches.

Mon 4/286:00 amSEA - DCA

1 stop27h 09mFrontier

Tue 4/296:00 pmDCA - SEA

1 stop9h 44mFrontier

Deal found 4/25

$228

Wed 4/306:00 amSEA - DCA

1 stop12h 59mFrontier

Fri 5/21:00 pmDCA - SEA

1 stop14h 44mFrontier

Deal found 4/25

$228

Thu 5/14:24 pmSEA - IAD

Nonstop4h 59mHawaiian Airlines

Sat 5/246:15 pmIAD - SEA

Nonstop5h 45mHawaiian Airlines

Deal found 4/24

$493

Thu 5/112:45 amSEA - BWI

1 stop6h 45mDelta

Fri 5/97:02 pmBWI - SEA

1 stop7h 45mDelta

Deal found 4/25

$557

Fri 5/26:52 pmSEA - IAD

1 stop8h 39mMultiple Airlines

Fri 5/96:30 amIAD - SEA

Nonstop5h 43mMultiple Airlines

Deal found 4/24

$425

Fri 5/28:24 amSEA - DCA

Nonstop5h 14mMultiple Airlines

Tue 5/66:00 pmDCA - SEA

1 stop8h 49mMultiple Airlines

Deal found 4/24

$439

Fri 5/212:59 amSEA - BWI

1 stop10h 31mAmerican Airlines

Wed 5/77:26 amBWI - SEA

1 stop13h 02mAmerican Airlines

Deal found 4/23

$556

Fri 5/212:45 amSEA - IAD

1 stop7h 24mDelta

Thu 5/297:45 amIAD - SEA

Nonstop5h 48mDelta

Deal found 4/24

$573

Sat 5/312:30 pmSEA - BWI

2 stops19h 05mSpirit Airlines

Wed 5/78:44 pmBWI - SEA

2 stops30h 26mSpirit Airlines

Deal found 4/23

$311

Sat 5/310:55 amSEA - IAD

1 stop7h 12mUnited Airlines

Sun 5/251:20 pmIAD - SEA

1 stop8h 33mUnited Airlines

Deal found 4/24

$533

Sun 5/48:22 pmSEA - IAD

1 stop31h 09mFrontier

Thu 5/157:31 amIAD - SEA

1 stop13h 29mFrontier

Deal found 4/25

$241

Sun 5/44:24 pmSEA - IAD

Nonstop4h 59mAlaska Airlines

Sat 5/177:59 pmIAD - SEA

1 stop16h 10mAlaska Airlines

Deal found 4/24

$498

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 April 25, 2025.

Fri 5/26:00 amSEA - BWI

1 stop8h 22mFrontier

Deal found 4/25

$128

Tue 5/276:00 amSEA - BWI

2 stops26h 04mSpirit Airlines

Deal found 4/24

$134

Sat 5/2410:27 pmSEA - BWI

Nonstop5h 02mAlaska Airlines

Deal found 4/25

$139

Fri 5/237:35 pmSEA - BWI

1 stop7h 05mDelta

Deal found 4/25

$140

Mon 5/2610:27 pmSEA - BWI

Nonstop5h 02mHawaiian Airlines

Deal found 4/24

$143

Thu 5/227:35 amSEA - DCA

Nonstop5h 14mDelta

Deal found 4/24

$144

Fri 5/164:00 pmSEA - IAD

Nonstop4h 59mHawaiian Airlines

Deal found 4/25

$144

Wed 6/2511:59 pmSEA - BWI

1 stop8h 30mSun Country Air

Deal found 4/25

$145

Thu 5/157:10 pmSEA - IAD

1 stop14h 28mSun Country Air

Deal found 4/24

$147

Wed 6/41:48 pmSEA - DCA

Nonstop5h 11mHawaiian Airlines

Deal found 4/24

$149

Thu 6/265:14 pmSEA - BWI

1 stop11h 53mUnited Airlines

Deal found 4/24

$150

Wed 5/286:00 amSEA - IAD

2 stops26h 04mMultiple Airlines

Deal found 4/25

$152

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Tue 6/3

1:48 pm-9:59 pm

Nonstop5h 11m

Washington, D.C. Reagan-National

Tue 6/10

7:00 am-11:37 pm

1 stop19h 37m

$226

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Mon 4/28

6:00 am-12:09 pm

1 stop27h 09m

Washington, D.C. Reagan-National

Tue 4/29

6:00 pm-12:44 am

1 stop9h 44m

$228

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 5/27

4:00 pm-11:59 pm

Nonstop4h 59m

Washington, D.C. Dulles Intl

Thu 5/29

7:25 am-2:16 pm

1 stop9h 51m

$233

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 5/16

6:52 pm-6:31 am

1 stop8h 39m

Washington, D.C. Dulles Intl

Sun 5/25

7:25 am-2:16 pm

1 stop9h 51m

$234

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Sat 5/24

3:20 pm-11:46 am

2 stops17h 26m

Baltimore/Washington

Sat 5/31

5:48 pm-12:37 am

1 stop9h 49m

$247

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Thu 5/29

6:00 am-6:10 am

1 stop21h 10m

Baltimore/Washington

Tue 6/3

2:59 pm-2:25 pm

2 stops26h 26m

$249

SeattleBaltimore

SEA - BWI

SEABWI

Seattle/Tacoma Intl

Mon 5/26

6:25 am-4:28 pm

1 stop7h 03m

Baltimore/Washington

Sun 6/1

8:44 pm-8:24 am

1 stop14h 40m

$250

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 5/28

9:18 am-5:15 pm

Nonstop4h 57m

Washington, D.C. Dulles Intl

Wed 5/28

6:15 pm-9:00 pm

Nonstop5h 45m

$251

SeattleWashington, D.C.

SEA - DCA

SEADCA

Seattle/Tacoma Intl

Sat 6/7

7:35 am-3:49 pm

Nonstop5h 14m

Washington, D.C. Reagan-National

Tue 6/10

4:40 pm-7:38 pm

Nonstop5h 58m

$257

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 6/3

11:30 pm-7:36 am

Nonstop5h 06m

Washington, D.C. Dulles Intl

Sat 6/7

7:00 am-9:40 am

Nonstop5h 40m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/25

Showing 1-10 of 55 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 April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 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
Kiwi.com	Price Accuracy3 stars	Trust Score*3 stars
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 eDreams the most. eDreams 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

Cheapflights partnered with top experts to bring you the best recommendations for 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

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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Washington, D.C.

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 90 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 $383). 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 31% 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.

Weekly flight availability from Seattle to Washington, D.C.

The most flights from SEA to WAS are scheduled on a Thursday (37 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (19 on average).

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 Alaska Airlines, Southwest 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.

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Alaska Airlines

8.0

Very good

9,927 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Southwest

8.0

Very good

4,289 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Delta

8.0

Very good

7,920 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Hawaiian Airlines

7.9

Good

2,393 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

United Airlines

7.4

Good

8,685 reviews

Alaska Airlines

8.0

Very good

9,927 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

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.. 9 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 31 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 Frontier. Our recent data shows that you can find tickets from as low as $228 on this airline. Additional options worth looking into are Spirit Airlines and Hawaiian Airlines, starting at $249 and $251 round-trip. Frontier is currently priced 43% 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 Frontier, with whom users have recently found tickets for as low as $128. However, be on the lookout for offers from Spirit Airlines and Alaska Airlines, 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. Dulles Intl, Seattle/Tacoma Intl - Baltimore/Washington and Seattle/Tacoma Intl - Washington, D.C. Reagan-National.
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 Ethiopian Air (93%), Lufthansa (92%) or Austrian Airlines (92%) 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 $729, our data shows the cheapest flight currently is $143. When looking at the most popular route, (Seattle/Tacoma Intl - Washington, D.C. Dulles Intl), you can expect to pay $233 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 $55.
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 $383). 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 9 airlines flying from Seattle to Washington, D.C.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$86	Average$248	FlexibilityNo cancel fee	On-time62%
Hawaiian Airlines	Cheapest$143	Average$437	FlexibilityNo cancel fee	On-time85%
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$198	Average$408	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$206	Average$447	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$238	Average$426	FlexibilityNo cancel fee	On-time69%
Alaska Airlines	Cheapest$246	Average$498	FlexibilityNo cancel fee	On-time75%
Southwest	Cheapest$321	Average$474	FlexibilityNo cancel fee	On-time63%

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$128+ 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 5/2. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Washington, D.C. are usually found in September or March, booked 90 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 April 25, 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 April 25, 2025.

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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.

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Everything you need to know about your flight from Seattle to Washington, D.C.

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 April 18, 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 April 25, 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 30, 2025.

Weekly flight availability from Seattle to Washington, D.C.

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 Alaska Airlines, Southwest 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 9 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 April 25, 2025.