HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$135+ Cheap flights from Washington to Dulles Intl (IAD)

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.
SEA — IAD
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington to Dulles Intl 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.

Cheap flight deals from Washington to Dulles Intl

Keep the following information in mind while searching for Washington to Dulles Intl flight deals. Data was last updated March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$240
(CheapOair)

One-way from

$135
(Alaska Airlines)

Popular in

December

Cheapest in

September

Average price

$382

Good round-trip deal

$334 or less

Good one-way deal

$193 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 Washington to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Washington to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 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 Washington to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Washington to Washington, D.C. Dulles Intl.
Search Deals

Find flight deals from Washington to Dulles Intl

Cheapest flights from Washington to Dulles Intl
Explore the most affordable flight options available from Washington to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

This CheapOair deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/58:22 pmSEA - IAD
1 stop31h 09mFrontier
Fri 5/97:45 amIAD - SEA
1 stop13h 17mFrontier
Deal found 3/28$240
This Expedia deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/26:52 pmSEA - IAD
1 stop8h 39mMultiple Airlines
Wed 5/710:00 amIAD - SEA
Nonstop5h 40mMultiple Airlines
Deal found 3/27$273
This American Airlines deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/265:22 amSEA - IAD
1 stop8h 01mAmerican Airlines
Sat 5/32:12 pmIAD - SEA
1 stop8h 13mAmerican Airlines
Deal found 3/27$276
This Frontier deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/21:15 pmPDX - IAD
1 stop14h 16mFrontier
Thu 5/88:01 amIAD - PDX
1 stop10h 41mFrontier
Deal found 3/26$278
This Delta deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2310:30 pmSEA - IAD
Nonstop4h 50mDelta
Mon 5/57:25 amIAD - SEA
Nonstop5h 55mDelta
Deal found 3/28$287
This Hawaiian Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2511:40 pmSEA - IAD
Nonstop5h 03mHawaiian Airlines
Sat 5/36:30 amIAD - SEA
Nonstop5h 43mHawaiian Airlines
Deal found 3/26$292
This Sun Country Air deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1711:50 pmSEA - IAD
1 stop8h 33mSun Country Air
Thu 4/2412:37 pmIAD - SEA
1 stop24h 55mSun Country Air
Deal found 3/27$295
This Delta deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/282:15 pmGEG - IAD
1 stop6h 25mDelta
Fri 5/26:52 pmIAD - GEG
1 stop8h 04mDelta
Deal found 3/27$297
This Southwest deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/177:20 amSEA - IAD
1 stop7h 35mSouthwest
Thu 4/246:40 pmIAD - SEA
1 stop7h 55mSouthwest
Deal found 3/28$297
This Alaska Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/146:04 pmGEG - IAD
1 stop8h 36mAlaska Airlines
Tue 4/227:13 pmIAD - GEG
1 stop7h 46mAlaska Airlines
Deal found 3/26$306
This Expedia deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/51:15 pmPDX - IAD
1 stop14h 16mMultiple Airlines
Wed 5/145:38 pmIAD - PDX
1 stop9h 04mMultiple Airlines
Deal found 3/27$308
This United Airlines deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/257:17 pmSEA - IAD
1 stop7h 05mUnited Airlines
Sun 4/278:40 amIAD - SEA
Nonstop5h 52mUnited Airlines
Deal found 3/27$314

Cheapflights Fare Finder

Customize your flight search to find flights from Washington to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 28, 2025.
Use the filters below to find and compare flights from Washington to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Washington

Fly to

Dulles Intl

Route

Depart

Return

Price

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 5/5

8:22 pm-6:31 am

1 stop31h 09m

Washington, D.C. Dulles Intl

Fri 5/9

7:45 am-6:02 pm

1 stop13h 17m

$240

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 5/2

6:52 pm-6:31 am

1 stop8h 39m

Washington, D.C. Dulles Intl

Wed 5/7

10:00 am-12:40 pm

Nonstop5h 40m

$273

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Sat 4/26

5:22 am-4:23 pm

1 stop8h 01m

Washington, D.C. Dulles Intl

Sat 5/3

2:12 pm-7:25 pm

1 stop8h 13m

$276

PortlandWashington, D.C.

PDX - IAD

PDXIAD

Portland

Fri 5/2

1:15 pm-6:31 am

1 stop14h 16m

Washington, D.C. Dulles Intl

Thu 5/8

8:01 am-3:42 pm

1 stop10h 41m

$278

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 4/23

10:30 pm-6:20 am

Nonstop4h 50m

Washington, D.C. Dulles Intl

Mon 5/5

7:25 am-10:20 am

Nonstop5h 55m

$287

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 4/25

11:40 pm-7:43 am

Nonstop5h 03m

Washington, D.C. Dulles Intl

Sat 5/3

6:30 am-9:13 am

Nonstop5h 43m

$292

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 4/17

11:50 pm-11:23 am

1 stop8h 33m

Washington, D.C. Dulles Intl

Thu 4/24

12:37 pm-10:32 am

1 stop24h 55m

$295

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 4/17

7:20 am-5:55 pm

1 stop7h 35m

Washington, D.C. Dulles Intl

Thu 4/24

6:40 pm-11:35 pm

1 stop7h 55m

$297

SpokaneWashington, D.C.

GEG - IAD

GEGIAD

Spokane

Mon 4/28

2:15 pm-11:40 pm

1 stop6h 25m

Washington, D.C. Dulles Intl

Fri 5/2

6:52 pm-11:56 pm

1 stop8h 04m

$297

SpokaneWashington, D.C.

GEG - IAD

GEGIAD

Spokane

Mon 4/14

6:04 pm-5:40 am

1 stop8h 36m

Washington, D.C. Dulles Intl

Tue 4/22

7:13 pm-11:59 pm

1 stop7h 46m

$306

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Washington to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Washington 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 Washington to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from State of Washington to Washington, D.C. Dulles Intl Airport?

Currently, August is the cheapest month in which you can book a flight from State of Washington to Washington, D.C. Dulles Intl Airport (average of $309). Flying from State of Washington to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $385). 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 WA to IAD?

Find hourly flight availability from Washington to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 28, 2025.

When flying from State of Washington to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from State of Washington to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Washington to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 28, 2025.

The most flights from USWA to IAD are scheduled on a Thursday (20 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport when rainfall is around 2.6 in.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, 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 Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated March 28, 2025.
Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta from Washington to Washington, D.C. by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.7

Boarding

8.2

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
4,274 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.7

Boarding

8.2

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
9,798 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.7

Boarding

8.2

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
7,897 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.7

Boarding

8.2

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
2,336 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.7

Boarding

8.2

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
8,603 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Comfort

8.1

Entertainment

7.6

Food

7.1

Crew

8.7

Boarding

8.2

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

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

  • What are the cheapest airlines to fly from State of Washington to Washington, D.C. Dulles Intl Airport one-way?

    One-way options have recently been found by users for as low as $135 on Alaska Airlines. Other airlines that offer cheap prices include Delta from $144 and Sun Country Air from $145 one-way.

  • What are the most popular routes from State of Washington to Washington, D.C. Dulles Intl Airport?

    Most travelers choose Seattle/Tacoma Intl - Washington, D.C. Dulles Intl, Portland - Washington, D.C. Dulles Intl or Spokane - Washington, D.C. Dulles Intl when deciding on the best route from State of Washington to Washington, D.C. Dulles Intl Airport.

  • What are the most reliable airlines from State of Washington to Washington, D.C. Dulles Intl Airport?

    Before booking your flight to Washington, D.C. Dulles Intl Airport from State of Washington, check out the most reliable airlines to get you to your destination on time: Korean Air (100%), Avianca (96%), Ethiopian Air( 93%).

  • What are the cheapest flights from State of Washington to Washington, D.C. Dulles Intl Airport?

    While on average a flight from State of Washington to Washington, D.C. Dulles Intl Airport is generally $1,254, 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 $277 for that flight.

  • Can I find deals for flights from Washington to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Washington to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Dulles Intl?

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

  • Can I find deals for business class flights from Washington to Dulles Intl?

    Yes. Cheapflights offers flight deals from Washington to Dulles Intl 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 State of Washington to Washington, D.C. Dulles Intl Airport?

    Currently, August is the cheapest month in which you can book a flight from State of Washington to Washington, D.C. Dulles Intl Airport (average of $309). Flying from State of Washington to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $385). 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.

See more FAQs

Traveling to a place near Washington?

Book flights to Washington if you plan to visit one of these locations
Arlington
Alexandria
Fairfax
Tysons
Springfield
Rockville
Woodbridge
Gaithersburg
Fredericksburg
Linthicum Heights
Silver Spring
Falls Church
Laurel
Easton
Herndon
Sterling
Bowie
Gettysburg
National Harbor
Oxon Hill

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Washington to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Dallas/Fort Worth to Dulles Intl flights
Los Angeles to Reagan-National flights
Los Angeles to Dulles Intl flights
Boston to Reagan-National flights
Boston to Dulles Intl flights
Dallas/Fort Worth to Baltimore flights
San Francisco to Dulles Intl flights
Boston to Baltimore flights
San Francisco to Reagan-National flights
San Francisco to Baltimore flights
Seattle to Reagan-National flights
Hobby to Baltimore flights
Dallas/Fort Worth to Reagan-National flights
Los Angeles to Baltimore flights
O'Hare Intl to Dulles Intl flights
O'Hare Intl to Baltimore flights
O'Hare Intl to Reagan-National flights
Hobby to Dulles Intl flights
Seattle to Dulles Intl flights
Atlanta to Dulles Intl flights
Hobby to Reagan-National flights
George Bush Intcntl to Dulles Intl flights
Minneapolis to Reagan-National flights
Denver to Reagan-National flights
Denver to Dulles Intl flights
Tampa to Dulles Intl flights
Atlanta to Baltimore flights
John F Kennedy Intl to Dulles Intl flights
Miami to Dulles Intl flights
Fort Lauderdale to Baltimore flights
Atlanta to Reagan-National flights
Tampa to Reagan-National flights
Minneapolis to Dulles Intl flights
Seattle to Baltimore flights
George Bush Intcntl to Baltimore flights
George Bush Intcntl to Reagan-National flights
Denver to Baltimore flights
Orlando to Dulles Intl flights
Charlotte to Dulles Intl flights
Detroit to Baltimore flights
John F Kennedy Intl to Reagan-National flights
Minneapolis to Baltimore flights
Sky Harbor Intl to Dulles Intl flights
Austin to Dulles Intl flights
LaGuardia to Reagan-National flights
Midway to Baltimore flights
Midway to Dulles Intl flights
Portland to Dulles Intl flights
Miami to Baltimore flights
Miami to Reagan-National flights

Top 6 airlines flying from Washington to Dulles Intl

Discover the top 6 airlines that operate flights from Washington to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$143Average$332FlexibilityNo cancel feeOn-time85%
Sun Country AirCheapest$169Average$534FlexibilityNo cancel feeOn-time83%
Alaska AirlinesCheapest$174Average$590FlexibilityNo cancel feeOn-time75%
DeltaCheapest$216Average$441FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$247Average$443FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$256Average$531FlexibilityNo cancel feeOn-time71%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.