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Cheap flights from Washington, D.C. to Seattle from $90

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 2/28. 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

Enter your travel dates to find the best prices.
Hawaiian Airlines Logo
7:05 am - 10:05 am
IAD
-
SEA
6h 00mnonstop
Hawaiian Airlines Logo
9:27 am - 5:20 pm
SEA
-
IAD
4h 53mnonstop
$197Hawaiian Airlines
Sat, Feb 14 - Sat, Feb 21
Frontier Logo
2:00 pm - 11:19 am
DCA
-
SEA
24h 19m
1 stop
Frontier Logo
9:23 pm - 1:15 pm
SEA
-
DCA
36h 52m
2 stops
$198Frontier
Sun, Feb 15 - Sun, Feb 22
Alaska Airlines Logo
8:00 am - 10:55 am
DCA
-
SEA
5h 55mnonstop
Alaska Airlines Logo
1:56 pm - 9:59 pm
SEA
-
DCA
5h 03mnonstop
$199Alaska Airlines
Thu, Feb 19 - Fri, Feb 27
Delta Logo
7:30 am - 10:29 am
IAD
-
SEA
5h 59mnonstop
Delta Logo
3:40 pm - 11:34 pm
SEA
-
IAD
4h 54mnonstop
$199Delta
Sat, Feb 14 - Sat, Feb 21
United Airlines Logo
5:55 pm - 8:56 pm
IAD
-
SEA
6h 01mnonstop
United Airlines Logo
12:43 pm - 11:21 pm
SEA
-
IAD
7h 38m
1 stop
$205United Airlines
Thu, Feb 19 - Tue, Feb 24
Alaska Airlines Logo
7:05 am - 10:05 am
IAD
-
SEA
6h 00mnonstop
Alaska Airlines Logo
9:45 pm - 5:40 am
SEA
-
IAD
4h 55mnonstop
$209Alaska Airlines
Thu, Feb 19 - Sun, Feb 22
United Airlines Logo
5:55 pm - 8:56 pm
IAD
-
SEA
6h 01mnonstop
United Airlines Logo
12:43 pm - 11:21 pm
SEA
-
IAD
7h 38m
1 stop
$215United Airlines
Fri, Feb 20 - Thu, Feb 26
Delta Logo
6:05 am - 10:55 am
BWI
-
SEA
7h 50m
1 stop
Delta Logo
11:15 pm - 10:32 am
SEA
-
BWI
8h 17m
1 stop
$217Delta
Thu, Feb 12 - Mon, Feb 16
American Airlines Logo
6:34 pm - 12:24 am
BWI
-
SEA
8h 50m
1 stop
American Airlines Logo
12:07 am - 11:18 am
SEA
-
BWI
8h 11m
1 stop
$218American Airlines
Fri, Feb 20 - Thu, Feb 26
American Airlines Logo
6:00 am - 1:19 pm
BWI
-
SEA
10h 19m
1 stop
American Airlines Logo
10:50 am - 11:10 pm
SEA
-
BWI
9h 20m
1 stop
$219American Airlines
Sun, Feb 1 - Wed, Feb 4

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

Our best Hawaiian Airlines deals on Washington, D.C. to Seattle flight tickets
Hawaiian Airlines
Feb 14
IAD7:05 amWashington, D.C. Dulles Intl
6h 00m
SEA10:05 amSeattle/Tacoma Intl
Feb 21
SEA9:27 amSeattle/Tacoma Intl
4h 53m
IAD5:20 pmWashington, D.C. Dulles Intl
$197
Hawaiian Airlines
Feb 11
IAD6:04 pmWashington, D.C. Dulles Intl
6h 04m
SEA9:08 pmSeattle/Tacoma Intl
Feb 18
SEA9:27 amSeattle/Tacoma Intl
4h 53m
IAD5:20 pmWashington, D.C. Dulles Intl
$201
Hawaiian Airlines
Feb 14
IAD7:05 amWashington, D.C. Dulles Intl
6h 00m
SEA10:05 amSeattle/Tacoma Intl
Feb 22
SEA9:45 pmSeattle/Tacoma Intl
4h 55m
IAD5:40 amWashington, D.C. Dulles Intl
$206

Frontier flights from Washington, D.C. to Seattle

Our best Frontier deals on Washington, D.C. to Seattle flight tickets
Frontier
Feb 15
DCA2:00 pmWashington, D.C. Reagan-National
24h 19m
1 stop
SEA11:19 amSeattle/Tacoma Intl
Feb 22
SEA9:23 pmSeattle/Tacoma Intl
36h 52m
2 stops
DCA1:15 pmWashington, D.C. Reagan-National
$198
Frontier
Feb 14
DCA6:00 pmWashington, D.C. Reagan-National
19h 55m
1 stop
SEA10:55 amSeattle/Tacoma Intl
Feb 17
SEA6:30 pmSeattle/Tacoma Intl
15h 45m
2 stops
DCA1:15 pmWashington, D.C. Reagan-National
$201
Frontier
Feb 14
DCA6:00 pmWashington, D.C. Reagan-National
19h 55m
1 stop
SEA10:55 amSeattle/Tacoma Intl
Feb 21
SEA1:16 pmSeattle/Tacoma Intl
20h 59m
1 stop
DCA1:15 pmWashington, D.C. Reagan-National
$202

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Seattle 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, momondo users made 832,500 searches. Data last updated January 15, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 2/14

7:05 am-10:05 am

Nonstop6h 00m

Seattle/Tacoma Intl

Sat 2/21

9:27 am-5:20 pm

Nonstop4h 53m

$197

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 2/15

2:00 pm-11:19 am

1 stop24h 19m

Seattle/Tacoma Intl

Sun 2/22

9:23 pm-1:15 pm

2 stops36h 52m

$198

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 2/19

8:00 am-10:55 am

Nonstop5h 55m

Seattle/Tacoma Intl

Fri 2/27

1:56 pm-9:59 pm

Nonstop5h 03m

$199

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Sat 2/14

7:30 am-10:29 am

Nonstop5h 59m

Seattle/Tacoma Intl

Sat 2/21

3:40 pm-11:34 pm

Nonstop4h 54m

$199

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 2/19

5:55 pm-8:56 pm

Nonstop6h 01m

Seattle/Tacoma Intl

Tue 2/24

12:43 pm-11:21 pm

1 stop7h 38m

$205

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Thu 2/19

7:05 am-10:05 am

Nonstop6h 00m

Seattle/Tacoma Intl

Sun 2/22

9:45 pm-5:40 am

Nonstop4h 55m

$209

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Fri 2/20

5:55 pm-8:56 pm

Nonstop6h 01m

Seattle/Tacoma Intl

Thu 2/26

12:43 pm-11:21 pm

1 stop7h 38m

$215

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Thu 2/12

6:05 am-10:55 am

1 stop7h 50m

Seattle/Tacoma Intl

Mon 2/16

11:15 pm-10:32 am

1 stop8h 17m

$217

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Fri 2/20

6:34 pm-12:24 am

1 stop8h 50m

Seattle/Tacoma Intl

Thu 2/26

12:07 am-11:18 am

1 stop8h 11m

$218

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Sun 2/1

6:00 am-1:19 pm

1 stop10h 19m

Seattle/Tacoma Intl

Wed 2/4

10:50 am-11:10 pm

1 stop9h 20m

$219

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 typical price of a round-trip flight between Washington, D.C. and Seattle?

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 $329. If you don’t want to visit Seattle in September, then you should wait until January to fly from Washington, D.C., when ticket prices are also cheap, with an average price of $345.

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 $438. 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 $572.

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 $429 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $504. 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. Reagan-National 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 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $387 when searching 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 $316 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.

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

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

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

As of January 2026, prices for Washington, D.C. to Seattle flights are approximately 3% more expensive 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

$185

Fastest flight time

5h 35m

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 $185. The best round-trip flight deal from Washington, D.C. to Seattle found on momondo in the last 72 hours is $275.
The fastest flight from Washington, D.C. to Seattle takes 5h 35m
Direct flights go from Washington, D.C. to Seattle every day.
There is 1 airport in Seattle. From Washington, D.C. there are direct flights to Seattle/Tacoma Intl (SEA).
Search flight deals

  • 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 35m 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
Spirit AirlinesPriceFrom $102Free CancellationRating
6.3
8,319 reviews
Search Spirit Airlines flights
DeltaPriceFrom $103Free CancellationRating
7.9
8,048 reviews
Search Delta flights
FrontierPriceFrom $111Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $143Free CancellationRating
7.8
2,827 reviews
Search Hawaiian Airlines flights
American AirlinesPriceFrom $179Free CancellationRating
7.2
11,129 reviews
Search American Airlines flights
Sun Country AirPriceFrom $186Free CancellationRating
6.9
342 reviews
Search Sun Country Air flights
SouthwestPriceFrom $218Free CancellationRating
8.0
4,258 reviews
Search Southwest flights
United AirlinesPriceFrom $219Free CancellationRating
7.4
9,163 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $239Free CancellationRating
8.0
11,713 reviews
Search Alaska Airlines flights

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

    Alaska Airlines flies from Washington, D.C. to Seattle around 8 times per week, with 11,713 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Washington, D.C. to Seattle in the last 72 hours was $239 (round-trip), much lower than the average airfare cost of $472 for Alaska Airlines flights on this route.

  • Delta Flights From Washington, D.C. to Seattle

    Across 8,048 Delta reviews on momondo, the average score is 7.9/10. Delta flies from Washington, D.C. to Seattle about 14 times each week, with ticket deals ranging from $103 to $350. 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
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Redmond
Tukwila
Cle Elum
Lakewood
Federal Way
Fife
Kirkland
Westport
Centralia
Shoreline

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.

An easier way to manage your Seattle trip

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