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Cheap flights from Seattle to Washington, D.C. Dulles Intl Airport from $128

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Washington, D.C. Dulles Intl Airport departing on 10/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Tue 7/23

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Easily compare round-trip flights from Seattle to Washington, D.C. Dulles Intl Airport

Below you can see the best fares for your round-trip flight route over the next six months. All fares were found on momondo this week. Browse the quickest and cheapest flights from Seattle to Washington, D.C. Dulles Intl Airport by changing tabs
Delta
Aug 31
SEA6:20 amSeattle/Tacoma Intl
14h 38m
2 stops
IAD11:58 pmWashington, D.C. Dulles Intl
Sep 7
IAD6:20 amWashington, D.C. Dulles Intl
17h 20m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
United Airlines
Aug 31
SEA11:49 pmSeattle/Tacoma Intl
8h 49m
1 stop
IAD11:38 amWashington, D.C. Dulles Intl
Sep 7
IAD12:45 pmWashington, D.C. Dulles Intl
12h 14m
2 stops
SEA9:59 pmSeattle/Tacoma Intl
Alaska Airlines
Aug 31
SEA7:07 amSeattle/Tacoma Intl
5h 08m
IAD3:15 pmWashington, D.C. Dulles Intl
Sep 7
IAD7:09 pmWashington, D.C. Dulles Intl
5h 51m
SEA10:00 pmSeattle/Tacoma Intl
Sun Country Air
Oct 24
SEA6:30 pmSeattle/Tacoma Intl
14h 26m
1 stop
IAD11:56 amWashington, D.C. Dulles Intl
Oct 27
IAD11:45 amWashington, D.C. Dulles Intl
8h 31m
1 stop
SEA5:16 pmSeattle/Tacoma Intl
American Airlines
Aug 28
SEA10:18 amSeattle/Tacoma Intl
10h 04m
1 stop
IAD11:22 pmWashington, D.C. Dulles Intl
Sep 3
IAD1:17 pmWashington, D.C. Dulles Intl
11h 44m
2 stops
SEA10:01 pmSeattle/Tacoma Intl
Multiple Airlines
Aug 9
SEA11:59 pmSeattle/Tacoma Intl
9h 11m
1 stop
IAD12:10 pmWashington, D.C. Dulles Intl
Aug 18
IAD7:02 amWashington, D.C. Dulles Intl
5h 42m
SEA9:44 amSeattle/Tacoma Intl

Find the cheapest one-way flights from Seattle to Washington, D.C. Dulles Intl Airport

If you're looking for one-way flights from Seattle to Washington, D.C. Dulles Intl Airport, view some of our deals below provided by Alaska Airlines, Delta and Sun Country Air
Alaska Airlines
Oct 8
SEA4:11 pmSeattle/Tacoma Intl
4h 48m
IAD11:59 pmWashington, D.C. Dulles Intl
Delta
Oct 1
SEA8:55 amSeattle/Tacoma Intl
5h 05m
IAD5:00 pmWashington, D.C. Dulles Intl
Sun Country Air
Sep 11
SEA5:42 pmSeattle/Tacoma Intl
13h 31m
1 stop
IAD10:13 amWashington, D.C. Dulles Intl

Find the cheapest direct flights from Seattle to Washington, D.C.

Alaska Airlines
Aug 31
SEA7:07 amSeattle/Tacoma Intl
5h 08m
IAD3:15 pmWashington, D.C. Dulles Intl
Sep 7
IAD4:13 pmWashington, D.C. Dulles Intl
5h 46m
SEA6:59 pmSeattle/Tacoma Intl
Delta
Aug 28
SEA8:35 amSeattle/Tacoma Intl
5h 00m
IAD4:35 pmWashington, D.C. Dulles Intl
Sep 1
IAD7:25 amWashington, D.C. Dulles Intl
5h 46m
SEA10:11 amSeattle/Tacoma Intl
United Airlines
Aug 14
SEA10:30 pmSeattle/Tacoma Intl
4h 59m
IAD6:29 amWashington, D.C. Dulles Intl
Sep 4
IAD5:26 pmWashington, D.C. Dulles Intl
5h 48m
SEA8:14 pmSeattle/Tacoma Intl
Alaska Airlines
Aug 31
SEA4:06 pmSeattle/Tacoma Intl
4h 53m
IAD11:59 pmWashington, D.C. Dulles Intl
Sep 7
IAD4:13 pmWashington, D.C. Dulles Intl
5h 46m
SEA6:59 pmSeattle/Tacoma Intl
Delta
Aug 28
SEA8:35 amSeattle/Tacoma Intl
5h 00m
IAD4:35 pmWashington, D.C. Dulles Intl
Sep 2
IAD7:25 amWashington, D.C. Dulles Intl
5h 46m
SEA10:11 amSeattle/Tacoma Intl
United Airlines
Aug 13
SEA11:20 pmSeattle/Tacoma Intl
4h 59m
IAD7:19 amWashington, D.C. Dulles Intl
Sep 4
IAD8:55 amWashington, D.C. Dulles Intl
5h 49m
SEA11:44 amSeattle/Tacoma Intl

Search last-minute flights to Washington, D.C. Dulles Intl Airport from Seattle

Find and compare round-trip flight prices for your last-minute flight from Seattle to Washington, D.C. Dulles Intl Airport
Sun Country Air
Jul 16
SEA7:10 pmSeattle/Tacoma Intl
12h 20m
1 stop
IAD10:30 amWashington, D.C. Dulles Intl
Jul 22
IAD7:05 pmWashington, D.C. Dulles Intl
19h 07m
1 stop
SEA11:12 amSeattle/Tacoma Intl
Multiple Airlines
Jul 19
SEA11:59 pmSeattle/Tacoma Intl
9h 11m
1 stop
IAD12:10 pmWashington, D.C. Dulles Intl
Jul 24
IAD11:20 amWashington, D.C. Dulles Intl
16h 15m
2 stops
SEA12:35 amSeattle/Tacoma Intl
Delta
Jul 16
SEA9:59 pmSeattle/Tacoma Intl
4h 57m
IAD5:56 amWashington, D.C. Dulles Intl
Aug 13
IAD7:25 amWashington, D.C. Dulles Intl
5h 46m
SEA10:11 amSeattle/Tacoma Intl
United Airlines
Jul 17
SEA6:35 pmSeattle/Tacoma Intl
7h 50m
1 stop
IAD5:25 amWashington, D.C. Dulles Intl
Aug 13
IAD10:10 pmWashington, D.C. Dulles Intl
5h 44m
SEA12:54 amSeattle/Tacoma Intl
Alaska Airlines
Jul 16
SEA9:36 amSeattle/Tacoma Intl
5h 01m
IAD5:37 pmWashington, D.C. Dulles Intl
Aug 13
IAD4:16 pmWashington, D.C. Dulles Intl
10h 28m
1 stop
SEA11:44 pmSeattle/Tacoma Intl
American Airlines
Jul 16
SEA9:47 pmSeattle/Tacoma Intl
8h 07m
1 stop
IAD8:54 amWashington, D.C. Dulles Intl
Aug 12
IAD5:29 pmWashington, D.C. Dulles Intl
8h 55m
1 stop
SEA11:24 pmSeattle/Tacoma Intl

Sun Country Air flights from Seattle to Washington, D.C. Dulles Intl Airport

Our best Sun Country Air deals on Seattle to Washington, D.C. Dulles Intl Airport flight tickets
Sun Country Air
Oct 24
SEA6:30 pmSeattle/Tacoma Intl
14h 26m
1 stop
IAD11:56 amWashington, D.C. Dulles Intl
Oct 27
IAD11:45 amWashington, D.C. Dulles Intl
8h 31m
1 stop
SEA5:16 pmSeattle/Tacoma Intl
Sun Country Air
Aug 9
SEA11:59 pmSeattle/Tacoma Intl
9h 11m
1 stop
IAD12:10 pmWashington, D.C. Dulles Intl
Aug 18
IAD1:47 pmWashington, D.C. Dulles Intl
12h 06m
1 stop
SEA10:53 pmSeattle/Tacoma Intl
Sun Country Air
Jul 31
SEA11:59 pmSeattle/Tacoma Intl
10h 36m
1 stop
IAD1:35 pmWashington, D.C. Dulles Intl
Aug 15
IAD12:13 pmWashington, D.C. Dulles Intl
13h 40m
1 stop
SEA10:53 pmSeattle/Tacoma Intl

American Airlines flights from Seattle to Washington, D.C. Dulles Intl Airport

Our best American Airlines deals on Seattle to Washington, D.C. Dulles Intl Airport flight tickets
American Airlines
Aug 28
SEA10:18 amSeattle/Tacoma Intl
10h 04m
1 stop
IAD11:22 pmWashington, D.C. Dulles Intl
Sep 3
IAD1:17 pmWashington, D.C. Dulles Intl
11h 44m
2 stops
SEA10:01 pmSeattle/Tacoma Intl
American Airlines
Sep 4
SEA5:30 amSeattle/Tacoma Intl
8h 00m
1 stop
IAD4:30 pmWashington, D.C. Dulles Intl
Sep 5
IAD1:58 pmWashington, D.C. Dulles Intl
12h 23m
2 stops
SEA11:21 pmSeattle/Tacoma Intl
American Airlines
Sep 4
SEA12:22 amSeattle/Tacoma Intl
10h 06m
2 stops
IAD1:28 pmWashington, D.C. Dulles Intl
Sep 10
IAD11:04 amWashington, D.C. Dulles Intl
11h 27m
2 stops
SEA7:31 pmSeattle/Tacoma Intl

How to get the cheapest flight ticket from Seattle to Washington, D.C. Dulles Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

January. The cheapest time of year to fly to Washington, D.C. Dulles Intl Airport from Seattle is January. Most expensive is June

What is the cheapest day to depart Seattle for Washington, D.C. Dulles Intl Airport?

Thursday. The cheapest day of the week is typically Thursday. The most expensive is typically Sunday

When is the cheapest time to fly from Seattle to Washington, D.C. Dulles Intl Airport?

In the afternoon. Seattle to Washington, D.C. Dulles Intl Airport flights are approximately 15% more expensive at noon than in the afternoon

What is the cheapest airline that flies to Washington, D.C. Dulles Intl Airport from Seattle?

Delta. Delta, Alaska Airlines, and United Airlines are the most popular carriers operating from Seattle to Washington, D.C. Dulles Intl Airport

How far in advance should you book Seattle to Washington, D.C. Dulles Intl Airport flights?

42 days before. The cheapest time to buy a flight from Seattle to Washington, D.C. Dulles Intl Airport is approximately 42 days to departure

How many flights depart from Seattle to Washington, D.C. Dulles Intl Airport on average per day?

15 flights are operational weekly from Seattle to Washington, D.C. Dulles Intl Airport as of July 2024. The most popular departure time for this route is 7:00AM, with 44% of flights per day taking off at noon.

How many flights depart from Seattle to Washington, D.C. Dulles Intl Airport on average per week?

108 flights are operational weekly from Seattle to Washington, D.C. Dulles Intl Airport as of July 2024. The most popular departure day for this route is Monday, with 16% of flights per week taking off on this day.

What cabin class options are available on Seattle to Washington, D.C. Dulles Intl Airport flights?

There are 4 cabin classes available to choose from on Seattle to Washington, D.C. Dulles Intl Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Seattle to Washington, D.C. Dulles Intl Airport flight prices changed over time?

As of July 2024, prices for Seattle to Washington, D.C. Dulles Intl Airport flights are approximately 14% cheaper when compared to flights at the same time last year.

Cheap Seattle to Washington, D.C. Dulles Intl Airport (SEA to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Washington, D.C. Dulles Intl Airport

Best Price Found

$128

Fastest flight time

4h 47m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from Seattle in the past 72 hours is $128. The best round-trip flight deal from Seattle to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $208.
The fastest flight from Seattle to Washington, D.C. Dulles Intl Airport takes 4h 47m
Direct flights go from Seattle to Washington, D.C. Dulles Intl Airport every day.

  • How far is Seattle/Tacoma Intl to Washington, D.C. Dulles Intl by plane?

    There are 2299.7 mi between Seattle/Tacoma Intl and Washington, D.C. Dulles Intl. A reasonable flight in good conditions will take 4h 49m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Washington, D.C. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The travel and health documents required for your trip to Washington, D.C. Dulles Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington, D.C. Dulles Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.


Best airlines flying from Seattle to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from Seattle to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $151Free CancellationRating
8.0
9,842 reviews
Search Delta flights
Alaska AirlinesPriceFrom $159Free CancellationRating
8.0
9,367 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $216Free CancellationRating
7.4
10,000 reviews
Search United Airlines flights
American AirlinesPriceFrom $338Free CancellationRating
7.3
10,000 reviews
Search American Airlines flights
  • Delta Flights From Seattle to Washington, D.C. Dulles Intl Airport

    Across 5 Delta flights from Seattle to Washington, D.C. Dulles Intl Airport this week, the average price was $388, with the best Delta deals starting from $151 round-trip. 9,842 users have rated Delta on momondo, with an average score of 8.0/10.

  • Alaska Airlines Flights From Seattle to Washington, D.C. Dulles Intl Airport

    Alaska Airlines is also a popular choice for this route. Alaska Airlines flight deals for Seattle to Washington, D.C. Dulles Intl Airport start from as low as $159 round-trip, depending on your selected dates, with average Alaska Airlines deals seen on momondo around $388. Alaska Airlines operates 14 flights to Washington, D.C. Dulles Intl Airport from Seattle in an average week. Users have rated it 8.0/10 across 9,367 reviews.


Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Washington, D.C.?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Washington, D.C.. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Seattle to Washington, D.C. with flexible booking policies on momondo?

Yes. All flights to Washington, D.C. from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Seattle to Washington, D.C.?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Washington, D.C..

I’m not ready to book a flight from Seattle to Washington, D.C. right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Seattle to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.


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