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

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 50% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 5 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.

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

16 flights are operational daily from Seattle to Washington, D.C. Dulles Intl Airport as of August 2026. The most popular departure time for this route is 8:00AM, with 36% of flights per day taking off in the afternoon.

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 August 2026, there are 5 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.

$171 Cheap Flights from Seattle to Washington, D.C. Dulles Intl Airport in 2026

Discover deals from 900+ travel sites with momondo.

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.

10:34 am - 8:04 am-

18h 30m

8:59 am - 10:39 am-

28h 40m

$285Frontier

Fri, Aug 21 - Wed, Aug 26

3:58 pm - 11:59 pm-

5h 01mnonstop

7:25 am - 10:05 am-

5h 40mnonstop

$285Delta

Fri, Sep 4 - Tue, Sep 8

9:35 pm - 5:40 am-

5h 05mnonstop

7:00 am - 9:37 am-

5h 37mnonstop

$285Alaska Airlines

Mon, Sep 21 - Sun, Sep 27

3:56 pm - 11:59 pm-

5h 03mnonstop

9:03 am - 11:39 am-

5h 36mnonstop

$285Alaska Airlines

Thu, Aug 27 - Sun, Aug 30

11:04 pm - 7:09 am-

5h 05mnonstop

5:33 pm - 8:18 pm-

5h 45mnonstop

$285United Airlines

Wed, Sep 9 - Mon, Sep 14

8:10 am - 4:16 pm-

5h 06mnonstop

5:45 pm - 8:37 pm-

5h 52mnonstop

$285United Airlines

Thu, Sep 17 - Mon, Sep 28

3:58 pm - 11:59 pm-

5h 01mnonstop

7:10 am - 9:55 am-

5h 45mnonstop

$285Delta

Tue, Aug 25 - Sun, Aug 30

11:54 am - 8:04 am-

17h 10m

8:59 am - 10:39 am-

28h 40m

$288Frontier

Mon, Aug 31 - Mon, Sep 7

6:40 am - 6:57 pm-

9h 17m

6:14 am - 11:25 am-

8h 11m

$304American Airlines

Thu, Sep 24 - Wed, Sep 30

9:42 pm - 9:57 am-

9h 15m

5:08 am - 9:45 am-

7h 37m

$304American Airlines

Wed, Aug 26 - Sun, Aug 30

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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

Alaska Airlines

Sep 3

SEA3:56 pmSeattle/Tacoma Intl

5h 03m

IAD11:59 pmWashington, D.C. Dulles Intl

Sep 9

IAD9:03 amWashington, D.C. Dulles Intl

5h 36m

SEA11:39 amSeattle/Tacoma Intl

$290

Alaska Airlines

Sep 3

SEA3:56 pmSeattle/Tacoma Intl

5h 03m

IAD11:59 pmWashington, D.C. Dulles Intl

Sep 6

IAD7:00 amWashington, D.C. Dulles Intl

5h 37m

SEA9:37 amSeattle/Tacoma Intl

$293

Alaska Airlines

Aug 29

SEA9:35 pmSeattle/Tacoma Intl

5h 05m

IAD5:40 amWashington, D.C. Dulles Intl

Sep 5

IAD5:47 pmWashington, D.C. Dulles Intl

5h 47m

SEA8:34 pmSeattle/Tacoma Intl

$297

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

Aug 22

SEA8:53 pmSeattle/Tacoma Intl

8h 11m

1 stop

IAD8:04 amWashington, D.C. Dulles Intl

Aug 25

IAD8:59 amWashington, D.C. Dulles Intl

13h 39m

2 stops

SEA7:38 pmSeattle/Tacoma Intl

$288

Frontier

Sep 7

SEA9:36 pmSeattle/Tacoma Intl

28h 25m

1 stop

IAD5:01 amWashington, D.C. Dulles Intl

Sep 22

IAD6:00 amWashington, D.C. Dulles Intl

30h 42m

1 stop

SEA9:42 amSeattle/Tacoma Intl

$289

Frontier

Aug 22

SEA8:53 pmSeattle/Tacoma Intl

8h 11m

1 stop

IAD8:04 amWashington, D.C. Dulles Intl

Aug 26

IAD8:59 amWashington, D.C. Dulles Intl

13h 39m

2 stops

SEA7:38 pmSeattle/Tacoma Intl

$292

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

Fri 8/21

10:34 am-8:04 am

2 stops18h 30m

Washington, D.C. Dulles Intl

Wed 8/26

8:59 am-10:39 am

1 stop28h 40m

$285

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Fri 9/4

3:58 pm-11:59 pm

Nonstop5h 01m

Washington, D.C. Dulles Intl

Tue 9/8

7:25 am-10:05 am

Nonstop5h 40m

$285

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 9/21

9:35 pm-5:40 am

Nonstop5h 05m

Washington, D.C. Dulles Intl

Sun 9/27

7:00 am-9:37 am

Nonstop5h 37m

$285

Quickest round-trip

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 8/27

3:56 pm-11:59 pm

Nonstop5h 03m

Washington, D.C. Dulles Intl

Sun 8/30

9:03 am-11:39 am

Nonstop5h 36m

$285

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 9/9

11:04 pm-7:09 am

Nonstop5h 05m

Washington, D.C. Dulles Intl

Mon 9/14

5:33 pm-8:18 pm

Nonstop5h 45m

$285

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 9/17

8:10 am-4:16 pm

Nonstop5h 06m

Washington, D.C. Dulles Intl

Mon 9/28

5:45 pm-8:37 pm

Nonstop5h 52m

$285

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Tue 8/25

3:58 pm-11:59 pm

Nonstop5h 01m

Washington, D.C. Dulles Intl

Sun 8/30

7:10 am-9:55 am

Nonstop5h 45m

$285

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Mon 8/31

11:54 am-8:04 am

2 stops17h 10m

Washington, D.C. Dulles Intl

Mon 9/7

8:59 am-10:39 am

1 stop28h 40m

$288

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Thu 9/24

6:40 am-6:57 pm

1 stop9h 17m

Washington, D.C. Dulles Intl

Wed 9/30

6:14 am-11:25 am

1 stop8h 11m

$304

SeattleWashington, D.C.

SEA - IAD

SEAIAD

Seattle/Tacoma Intl

Wed 8/26

9:42 pm-9:57 am

1 stop9h 15m

Washington, D.C. Dulles Intl

Sun 8/30

5:08 am-9:45 am

1 stop7h 37m

$304

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?

Prices are currently low for flights on this route.

Typical prices usually range from $355 to $583.
The lowest price recently found on this route was $285.

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 $309. 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 $328.

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

Our data shows that Friday 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 $454. 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 $626.

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 $362 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $558 on average. Flights to Washington, D.C. Dulles Intl Airport from Seattle at noon 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 $441 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 $308 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?

No. A direct flight is the cheapest option for a flight between Seattle to Washington, D.C. Dulles Intl Airport.

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

As of August 2026, prices for Seattle to Washington, D.C. Dulles Intl Airport flights are approximately 43% 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	$303
Fastest flight time	4h 55m
Direct flights	Every day

The best one-way flight to Washington, D.C. Dulles Intl Airport from Seattle in the past 72 hours is $303. The best round-trip flight deal from Seattle to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $363.

The fastest flight from Seattle to Washington, D.C. Dulles Intl Airport takes 4h 55m

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 55m.
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 August 2026, there are 5 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, making up 20.56% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 20.30%, Boeing 737 MAX 9 with 19.03%, and Boeing 737 MAX 8 with 15.35%.
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 35%, Delta at 13%, and American Airlines at 1%.

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 2,736 reviews	Search Frontier flights
Delta	PriceFrom $147	Free Cancellation	Rating 7.8 8,484 reviews	Search Delta flights
American Airlines	PriceFrom $196	Free Cancellation	Rating 7.1 11,851 reviews	Search American Airlines flights
United Airlines	PriceFrom $234	Free Cancellation	Rating 7.4 10,060 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $236	Free Cancellation	Rating 7.9 12,762 reviews	Search Alaska Airlines flights

Alaska Airlines Flights From Seattle to Washington, D.C. Dulles Intl Airport
Across 8 Alaska Airlines flights from Seattle to Washington, D.C. Dulles Intl Airport this week, the average price was $454, with the best Alaska Airlines deals starting from $236 round-trip. 12,762 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 $310. Delta operates 7 flights to Washington, D.C. Dulles Intl Airport from Seattle in an average week. Users have rated it 7.8/10 across 8,484 reviews.

Alexandria

National Harbor

Arlington

Gettysburg

Winchester

Waldorf

Laurel

Woodbridge

Fredericksburg

Gaithersburg

Linthicum Heights

Rockville

Silver Spring

Towson

Sterling

Colonial Beach

Springfield

Fairfax

Tysons

Edgewood

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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Cheap flights from Seattle to Washington, D.C. from $171

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 8/24. 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

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.

See travel insights to Washington, D.C. from

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

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

Traveling to a place near Washington, D.C.?

Why use momondo?

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

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Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Washington, D.C.

Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo

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According to popular flight searches on momondo this year

Washington, D.C. Dulles Intl Airport flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Washington, D.C.

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

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List of cabin classes available on flights landing in Washington, D.C.. Availability may vary depending on flight origin and airline.

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