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Cheap flights from Washington, D.C. to Seattle from $88

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Seattle departing on 10/14. 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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Find the cheapest flights from Washington, D.C. to Seattle

Cheap round-trip flights

American Airlines Logo
2:21 pm - 10:27 pmIAD-SEA
11h 06m1 stop
American Airlines Logo
5:26 am - 4:50 pmSEA-IAD
8h 24m1 stop
$177American Airlines
Find Deal
Tue, Sep 9 - Tue, Sep 23
American Airlines Logo
6:49 am - 11:53 amBWI-SEA
8h 04m1 stop
American Airlines Logo
11:45 am - 9:37 pmSEA-BWI
6h 52m1 stop
$177American Airlines
Find Deal
Tue, Oct 7 - Tue, Nov 4
Delta Logo
6:10 pm - 12:14 amBWI-SEA
9h 04m1 stop
Delta Logo
6:05 am - 4:59 pmSEA-BWI
7h 54m1 stop
$207Delta
Find Deal
Sat, Nov 15 - Tue, Dec 2
Delta Logo
4:39 pm - 12:11 amBWI-SEA
10h 32m1 stop
Delta Logo
1:45 pm - 12:12 amSEA-BWI
7h 27m1 stop
$227Delta
Find Deal
Sat, Oct 11 - Fri, Oct 24
United Airlines Logo
8:32 am - 4:20 pmBWI-SEA
10h 48m2 stops
United Airlines Logo
11:05 am - 9:24 pmSEA-BWI
7h 19m1 stop
$256United Airlines
Find Deal
Tue, Oct 21 - Fri, Oct 31
Alaska Airlines Logo
7:00 am - 9:40 amBWI-SEA
5h 40mnonstop
Alaska Airlines Logo
9:29 pm - 5:33 amSEA-BWI
5h 04mnonstop
$277Alaska Airlines
Find Deal
Sun, Sep 14 - Sun, Sep 21
Hawaiian Airlines Logo
8:00 am - 10:49 amDCA-SEA
5h 49mnonstop
Hawaiian Airlines Logo
1:35 pm - 9:44 pmSEA-DCA
5h 09mnonstop
$277Hawaiian Airlines
Find Deal
Sat, Aug 23 - Wed, Aug 27
United Airlines Logo
12:55 pm - 7:25 pmIAD-SEA
9h 30m1 stop
United Airlines Logo
8:00 am - 4:07 pmSEA-IAD
5h 07mnonstop
$283United Airlines
Find Deal
Sat, Nov 1 - Wed, Nov 5
Alaska Airlines Logo
5:52 pm - 9:25 amIAD-SEA
18h 33m1 stop
Alaska Airlines Logo
9:05 am - 5:09 pmSEA-IAD
5h 04mnonstop
$287Alaska Airlines
Find Deal
Sat, Aug 23 - Sat, Aug 30
Hawaiian Airlines Logo
8:59 am - 2:48 pmDCA-SEA
8h 49m1 stop
Hawaiian Airlines Logo
9:53 am - 9:59 pmSEA-DCA
9h 06m1 stop
$296Hawaiian Airlines
Find Deal
Wed, Sep 3 - Tue, Sep 9

United Airlines flights from Washington, D.C. to Seattle

Our best United Airlines deals on Washington, D.C. to Seattle flight tickets
United Airlines
Oct 21
BWI8:32 amBaltimore/Washington
10h 48m
2 stops
SEA4:20 pmSeattle/Tacoma Intl
Oct 31
SEA11:05 amSeattle/Tacoma Intl
7h 19m
1 stop
BWI9:24 pmBaltimore/Washington
United Airlines
Nov 1
IAD12:55 pmWashington, D.C. Dulles Intl
9h 30m
1 stop
SEA7:25 pmSeattle/Tacoma Intl
Nov 5
SEA8:00 amSeattle/Tacoma Intl
5h 07m
IAD4:07 pmWashington, D.C. Dulles Intl
United Airlines
Nov 1
IAD12:55 pmWashington, D.C. Dulles Intl
9h 30m
1 stop
SEA7:25 pmSeattle/Tacoma Intl
Nov 5
SEA11:05 amSeattle/Tacoma Intl
7h 18m
1 stop
IAD9:23 pmWashington, D.C. Dulles Intl

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

Our best Sun Country Air deals on Washington, D.C. to Seattle flight tickets
Sun Country Air
Jul 19
IAD12:46 pmWashington, D.C. Dulles Intl
13h 01m
1 stop
SEA10:47 pmSeattle/Tacoma Intl
Jul 21
SEA11:59 pmSeattle/Tacoma Intl
8h 44m
1 stop
IAD11:43 amWashington, D.C. Dulles Intl
Sun Country Air
Jul 5
IAD12:40 pmWashington, D.C. Dulles Intl
13h 07m
1 stop
SEA10:47 pmSeattle/Tacoma Intl
Jul 11
SEA11:59 pmSeattle/Tacoma Intl
8h 44m
1 stop
IAD11:43 amWashington, D.C. Dulles Intl
Sun Country Air
Jul 19
BWI12:25 pmBaltimore/Washington
13h 22m
1 stop
SEA10:47 pmSeattle/Tacoma Intl
Jul 25
SEA11:59 pmSeattle/Tacoma Intl
8h 24m
1 stop
BWI11:23 amBaltimore/Washington

See travel insights to Seattle from

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

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 to Seattle?

In general, September is the cheapest month to fly from Washington, D.C. to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $337. If you don’t want to visit Seattle in September, then you should wait until October to fly from Washington, D.C., when ticket prices are also cheap, with an average price of $366.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Washington, D.C. is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $441. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Washington, D.C. because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $571.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Washington, D.C. in the evening is the least expensive time of day to depart. momondo users have found prices as low as $417 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $523. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

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

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Washington, D.C. when booking 17 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $413 when searching 17 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Washington, D.C. for as low as $333 on momondo.

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

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

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

As of June 2025, prices for Washington, D.C. to Seattle flights are approximately 34% cheaper when compared to flights at the same time last year.

When to book flights from Washington, D.C. to Seattle

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

Cheap Washington, D.C. to Seattle (WAS to SEA) flight deals and tips

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

Best Price Found

$88

Fastest flight time

5h 38m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Washington, D.C. in the past 72 hours is $88. The best round-trip flight deal from Washington, D.C. to Seattle found on momondo in the last 72 hours is $177.
The fastest flight from Washington, D.C. to Seattle takes 5h 38m
Direct flights go from Washington, D.C. to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

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

    The straight-line distance from Washington, D.C. to Seattle/Tacoma Intl is 2320.5 mi. 5h 38m is a normal flight duration for this route.

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

    Prices for flights from Washington, D.C. to Seattle/Tacoma Intl Airport were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Washington, D.C. to Seattle?

  • What is the most popular airline from Washington, D.C. to Seattle?


Best airlines flying from Washington, D.C. to Seattle

Compare and see reviews for airlines that fly from Washington, D.C. to Seattle with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $111Free CancellationRating
5.9
3,295 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $140Free CancellationRating
6.3
8,052 reviews
Search Spirit Airlines flights
Sun Country AirPriceFrom $144Free CancellationRating
6.9
345 reviews
Search Sun Country Air flights
Hawaiian AirlinesPriceFrom $168Free CancellationRating
7.8
2,494 reviews
Search Hawaiian Airlines flights
American AirlinesPriceFrom $206Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $206Free CancellationRating
8.0
7,946 reviews
Search Delta flights
Alaska AirlinesPriceFrom $262Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $273Free CancellationRating
7.4
8,790 reviews
Search United Airlines flights
SouthwestPriceFrom $306Free CancellationRating
8.0
4,287 reviews
Search Southwest flights
  • Delta Flights From Washington, D.C. to Seattle

    Delta flies from Washington, D.C. to Seattle around 14 times per week, with 7,950 momondo users rating the airline 8.0/10. The cheapest Delta deal from Washington, D.C. to Seattle in the last 72 hours was $206 (round-trip), much lower than the average airfare cost of $380 for Delta flights on this route.

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

    Across 10,000 Alaska Airlines reviews on momondo, the average score is 8.0/10. Alaska Airlines flies from Washington, D.C. to Seattle about 11 times each week, with ticket deals ranging from $262 to $485. Price data is based on momondo searches in the last 72 hours.


Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Tacoma
SeaTac
Ocean Shores
Olympia
Renton
Kent
Federal Way
Tukwila
Puyallup
Kirkland
Lynnwood
Marysville
Lakewood
Fife
Shoreline
Cle Elum
Centralia
Redmond
Westport

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to Seattle for you.

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

Yes. momondo allows you to filter the results for Washington, D.C. to Seattle flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Seattle from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Washington, D.C. and alert you when they change.


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1 adult
Tue 6/17
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