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

17 flights are operational daily from Seattle to Washington, D.C. Dulles Intl Airport as of June 2026. The most popular departure time for this route is 11:00PM, with 34% of flights per day taking off at noon.

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

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

What airlines fly to Washington, D.C. Dulles Intl Airport?

Alaska Airlines, United Airlines and Delta are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from Seattle according to our data. Alaska Airlines is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 6 different airlines that fly to Washington, D.C. Dulles Intl Airport on a routine basis, so you have a few additional options to choose from.

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?

As of June 2026, there are 6 operators available to choose from 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.

$145 Cheap Flights from Seattle to Washington, D.C. Dulles Intl Airport in 2026

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

121 flights are operational weekly from Seattle to Washington, D.C. Dulles Intl Airport as of June 2026. The most popular departure day for this route is Thu, with 21% of flights per week taking off on this day.

Q: What is the typical price of a round-trip flight between Seattle and Washington, D.C. Dulles Intl Airport?

Prices are currently low for flights on this route. Typical prices usually range from $567 to $379. The lowest price recently found on this route was $292.

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

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:25 pm - 10:51 pm

SEA

IAD

7h 26m

1 stop

5:41 pm - 10:53 pm

IAD

SEA

8h 12m

1 stop

$292American Airlines

Wed, Sep 30 - Wed, Oct 7

8:12 pm - 8:25 am

SEA

IAD

9h 13m

1 stop

9:50 am - 10:39 am

IAD

SEA

27h 49m

1 stop

$293Frontier

Fri, Jul 3 - Sun, Jul 12

11:04 pm - 7:07 am

SEA

IAD

5h 03mnonstop

5:33 pm - 8:18 pm

IAD

SEA

5h 45mnonstop

$294United Airlines

Thu, Aug 20 - Mon, Aug 31

10:43 pm - 6:39 am

SEA

IAD

4h 56mnonstop

6:03 am - 8:48 am

IAD

SEA

5h 45mnonstop

$295Alaska Airlines

Thu, Jul 23 - Tue, Jul 28

10:43 pm - 6:39 am

SEA

IAD

4h 56mnonstop

6:03 am - 8:48 am

IAD

SEA

5h 45mnonstop

$297Alaska Airlines

Fri, Jul 10 - Tue, Jul 14

8:12 pm - 8:25 am

SEA

IAD

9h 13m

1 stop

9:50 am - 10:39 am

IAD

SEA

27h 49m

1 stop

$299Frontier

Fri, Jul 3 - Sun, Jul 12

8:13 pm - 8:20 am

SEA

IAD

9h 07m

1 stop

9:50 am - 10:39 am

IAD

SEA

27h 49m

1 stop

$300Frontier

Tue, Jul 7 - Fri, Jul 10

11:00 pm - 9:23 am

SEA

IAD

7h 23m

1 stop

5:26 pm - 11:04 pm

IAD

SEA

8h 38m

1 stop

$301United Airlines

Wed, Aug 19 - Sun, Aug 23

11:20 pm - 7:22 am

SEA

IAD

5h 02mnonstop

5:41 pm - 11:10 pm

IAD

SEA

8h 29m

1 stop

$304United Airlines

Thu, Aug 6 - Mon, Aug 10

8:51 pm - 6:14 pm

SEA

IAD

18h 23m

1 stop

7:00 am - 9:37 am

IAD

SEA

5h 37mnonstop

$305Alaska Airlines

Thu, Sep 3 - Mon, Sep 7

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

Our best Alaska Airlines deals on Seattle to Washington, D.C. Dulles Intl Airport flight tickets

Alaska Airlines

Jul 23

SEA10:43 pmSeattle/Tacoma Intl

4h 56m

IAD6:39 amWashington, D.C. Dulles Intl

Jul 28

IAD6:03 amWashington, D.C. Dulles Intl

5h 45m

SEA8:48 amSeattle/Tacoma Intl

$295

Alaska Airlines

Jul 10

SEA10:43 pmSeattle/Tacoma Intl

4h 56m

IAD6:39 amWashington, D.C. Dulles Intl

Jul 14

IAD6:03 amWashington, D.C. Dulles Intl

5h 45m

SEA8:48 amSeattle/Tacoma Intl

$297

Alaska Airlines

Sep 3

SEA8:51 pmSeattle/Tacoma Intl

18h 23m

1 stop

IAD6:14 pmWashington, D.C. Dulles Intl

Sep 7

IAD7:00 amWashington, D.C. Dulles Intl

5h 37m

SEA9:37 amSeattle/Tacoma Intl

$305

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

Our best Frontier deals on Seattle to Washington, D.C. Dulles Intl Airport flight tickets

Frontier

Jul 3

SEA8:12 pmSeattle/Tacoma Intl

9h 13m

1 stop

IAD8:25 amWashington, D.C. Dulles Intl

Jul 12

IAD9:50 amWashington, D.C. Dulles Intl

27h 49m

1 stop

SEA10:39 amSeattle/Tacoma Intl

$293

Frontier

Jul 3

SEA8:12 pmSeattle/Tacoma Intl

9h 13m

1 stop

IAD8:25 amWashington, D.C. Dulles Intl

Jul 12

IAD9:50 amWashington, D.C. Dulles Intl

27h 49m

1 stop

SEA10:39 amSeattle/Tacoma Intl

$299

Frontier

Jul 7

SEA8:13 pmSeattle/Tacoma Intl

9h 07m

1 stop

IAD8:20 amWashington, D.C. Dulles Intl

Jul 10

IAD9:50 amWashington, D.C. Dulles Intl

27h 49m

1 stop

SEA10:39 amSeattle/Tacoma Intl

$300

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 9/30

12:25 pm-10:51 pm

1 stop7h 26m

Washington, D.C. Dulles Intl

Wed 10/7

5:41 pm-10:53 pm

1 stop8h 12m

$292

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 7/3

8:12 pm-8:25 am

1 stop9h 13m

Washington, D.C. Dulles Intl

Sun 7/12

9:50 am-10:39 am

1 stop27h 49m

$293

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 8/20

11:04 pm-7:07 am

Nonstop5h 03m

Washington, D.C. Dulles Intl

Mon 8/31

5:33 pm-8:18 pm

Nonstop5h 45m

$294

Quickest round-trip

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 7/23

10:43 pm-6:39 am

Nonstop4h 56m

Washington, D.C. Dulles Intl

Tue 7/28

6:03 am-8:48 am

Nonstop5h 45m

$295

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 7/10

10:43 pm-6:39 am

Nonstop4h 56m

Washington, D.C. Dulles Intl

Tue 7/14

6:03 am-8:48 am

Nonstop5h 45m

$297

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 7/3

8:12 pm-8:25 am

1 stop9h 13m

Washington, D.C. Dulles Intl

Sun 7/12

9:50 am-10:39 am

1 stop27h 49m

$299

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 7/7

8:13 pm-8:20 am

1 stop9h 07m

Washington, D.C. Dulles Intl

Fri 7/10

9:50 am-10:39 am

1 stop27h 49m

$300

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 8/19

11:00 pm-9:23 am

1 stop7h 23m

Washington, D.C. Dulles Intl

Sun 8/23

5:26 pm-11:04 pm

1 stop8h 38m

$301

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 8/6

11:20 pm-7:22 am

Nonstop5h 02m

Washington, D.C. Dulles Intl

Mon 8/10

5:41 pm-11:10 pm

1 stop8h 29m

$304

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 9/3

8:51 pm-6:14 pm

1 stop18h 23m

Washington, D.C. Dulles Intl

Mon 9/7

7:00 am-9:37 am

Nonstop5h 37m

$305

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

What is the typical price of a round-trip flight between Seattle and Washington, D.C. Dulles Intl Airport?

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

In general, February is the cheapest month to fly from Seattle to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $303. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of February, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $324.

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Wednesday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $445. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to Washington, D.C. Dulles Intl Airport for around $612.

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Flying to Washington, D.C. Dulles Intl Airport from Seattle in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $359 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $536 on average. Flights to Washington, D.C. Dulles Intl Airport from Seattle in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Seattle/Tacoma Intl to Washington, D.C. Dulles Intl flight route?

Fly from Seattle/Tacoma Intl to Washington, D.C. Dulles Intl for the best Seattle/Tacoma Intl - Washington, D.C. Dulles Intl flight prices

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

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $431 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Seattle for as low as $340 on momondo.

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.

Can stopping save me money on Seattle to Washington, D.C. Dulles Intl Airport flights?

You could potentially save up to 2% on your flight if you consider stops on a Seattle to Washington, D.C. Dulles Intl Airport flight.

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

As of June 2026, prices for Seattle to Washington, D.C. Dulles Intl Airport flights are approximately 4% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Washington, D.C. Dulles Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Washington, D.C. Dulles Intl Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

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	$226
Fastest flight time	4h 53m
Direct flights	Every day

The best one-way flight to Washington, D.C. Dulles Intl Airport from Seattle in the past 72 hours is $226. The best round-trip flight deal from Seattle to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $382.

The fastest flight from Seattle to Washington, D.C. Dulles Intl Airport takes 4h 53m

Direct flights go from Seattle to Washington, D.C. Dulles Intl Airport every day.

Search flight deals

Frequently asked questions about flying from Seattle to Washington, D.C. Dulles Intl Airport

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 53m.
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?
As of June 2026, there are 6 operators available to choose from 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.
What is the most popular plane model from Seattle to Washington, D.C. Dulles Intl Airport?
Based on momondo bookings for flights between Seattle and Washington, D.C. Dulles Intl Airport, the leading plane model is Boeing 737 MAX 9, making up 20.03% of the total bookings. Other popular models include Boeing 737 with 19.88%, Boeing 737-800 Passenger/BBJ2 (winglets) with 17.34%, and Boeing 737 MAX 8 with 17.26%.
What is the most popular airline from Seattle to Washington, D.C. Dulles Intl Airport?
momondo data reveals that the most frequently booked airline on the route from Seattle to Washington, D.C. Dulles Intl Airport is Alaska Airlines, representing 50% of all bookings. The subsequent popular airlines are United Airlines at 33%, Delta at 13%, and Hawaiian Airlines at 2%.

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
Frontier	PriceFrom $126	Free Cancellation	Rating 5.6 2,914 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $138	Free Cancellation	Rating 7.8 2,831 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $147	Free Cancellation	Rating 7.8 8,395 reviews	Search Delta flights
United Airlines	PriceFrom $220	Free Cancellation	Rating 7.4 9,775 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $237	Free Cancellation	Rating 7.9 12,468 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $407	Free Cancellation	Rating 7.1 11,644 reviews	Search American Airlines flights

Alaska Airlines Flights From Seattle to Washington, D.C. Dulles Intl Airport
Across 9 Alaska Airlines flights from Seattle to Washington, D.C. Dulles Intl Airport this week, the average price was $453, with the best Alaska Airlines deals starting from $237 round-trip. 12,468 users have rated Alaska Airlines on momondo, with an average score of 7.9/10.
Delta Flights From Seattle to Washington, D.C. Dulles Intl Airport
Delta is also a popular choice for this route. Delta flight deals for Seattle to Washington, D.C. Dulles Intl Airport start from as low as $147 round-trip, depending on your selected dates, with average Delta deals seen on momondo around $313. Delta operates 4 flights to Washington, D.C. Dulles Intl Airport from Seattle in an average week. Users have rated it 7.8/10 across 8,395 reviews.

Alexandria

National Harbor

Gettysburg

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Winchester

Waldorf

Woodbridge

Laurel

Gaithersburg

Fredericksburg

Colonial Beach

Silver Spring

Rockville

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Linthicum Heights

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Tysons

Springfield

Fairfax

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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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Cheap flights from Seattle to Washington, D.C. from $145

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. departing on 8/19. 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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Alaska Airlines flights from Seattle to Washington, D.C. Dulles Intl Airport

Our best Alaska Airlines deals on Seattle to Washington, D.C. Dulles Intl Airport flight tickets

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

Our best Frontier deals on Seattle to Washington, D.C. Dulles Intl Airport flight tickets

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

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

What is the typical price of a round-trip flight between Seattle and Washington, D.C. Dulles Intl Airport?

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

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

What is the cheapest Seattle/Tacoma Intl to Washington, D.C. Dulles Intl flight route?

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

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

Can stopping save me money on Seattle to Washington, D.C. Dulles Intl Airport flights?

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

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

What airlines fly to Washington, D.C. Dulles Intl Airport?

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

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

When to book flights from Seattle to Washington, D.C. Dulles Intl Airport

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

Fastest flight time

Direct flights

Frequently asked questions about flying from Seattle to Washington, D.C. Dulles Intl Airport

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

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

Delta Flights From Seattle to Washington, D.C. Dulles Intl Airport

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An easier way to manage your Washington, D.C. Dulles Intl Airport trip

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