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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from $137

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. Reagan-National Airport to Seattle departing on 12/6. 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. Reagan-National Airport to Seattle (DCA-SEA)

Cheap round-trip flights

Logo
7:00 am - 12:13 pmDCA-SEA
8h 13m1 stop
Logo
1:52 pm - 9:59 pmSEA-DCA
5h 07mnonstop
$254
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Fri, Nov 7 - Wed, Nov 12
Logo
7:00 am - 12:13 pmDCA-SEA
8h 13m1 stop
Logo
8:49 am - 4:53 pmSEA-DCA
5h 04mnonstop
$255
Find Deal
Sat, Nov 1 - Wed, Nov 5
Frontier Logo
6:00 pm - 9:34 amDCA-SEA
18h 34m1 stop
Frontier Logo
6:12 am - 12:10 pmSEA-DCA
26h 58m1 stop
$256Frontier
Find Deal
Sat, Aug 30 - Sun, Sep 7
Frontier Logo
7:00 am - 12:07 pmDCA-SEA
8h 07m1 stop
Frontier Logo
8:43 pm - 9:59 pmSEA-DCA
22h 16m1 stop
$257Frontier
Find Deal
Wed, Oct 8 - Mon, Oct 13
Frontier Logo
1:00 pm - 8:51 pmDCA-SEA
10h 51m1 stop
Frontier Logo
6:41 am - 9:59 pmSEA-DCA
12h 18m1 stop
$258Frontier
Find Deal
Sat, Aug 30 - Wed, Sep 3
Logo
5:06 pm - 7:56 pmDCA-SEA
5h 50mnonstop
Logo
6:12 am - 4:59 pmSEA-DCA
7h 47m1 stop
$259
Find Deal
Sat, Sep 13 - Mon, Sep 15
Hawaiian Airlines Logo
5:00 pm - 8:03 pmDCA-SEA
6h 03mnonstop
Hawaiian Airlines Logo
1:52 pm - 9:59 pmSEA-DCA
5h 07mnonstop
$277Hawaiian Airlines
Find Deal
Sat, Nov 1 - Thu, Nov 6
Alaska Airlines Logo
8:59 am - 5:05 pmDCA-SEA
11h 06m1 stop
Alaska Airlines Logo
8:05 am - 8:00 pmSEA-DCA
8h 55m1 stop
$296Alaska Airlines
Find Deal
Wed, Nov 5 - Mon, Nov 17
American Airlines Logo
11:59 am - 6:13 pmDCA-SEA
9h 14m1 stop
American Airlines Logo
11:45 am - 11:24 pmSEA-DCA
8h 39m1 stop
$297American Airlines
Find Deal
Wed, Sep 17 - Fri, Dec 12
Alaska Airlines Logo
5:00 pm - 8:13 pmDCA-SEA
6h 13mnonstop
Alaska Airlines Logo
1:45 pm - 9:55 pmSEA-DCA
5h 10mnonstop
$307Alaska Airlines
Find Deal
Mon, Dec 15 - Wed, Jan 7

Frontier flights from Washington, D.C. Reagan-National Airport to Seattle

Our best Frontier deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets
Frontier
Aug 22
DCA6:00 pmWashington, D.C. Reagan-National
29h 51m
1 stop
SEA8:51 pmSeattle/Tacoma Intl
Sep 6
SEA7:00 amSeattle/Tacoma Intl
11h 59m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
$253
Find similar
Frontier
Sep 3
DCA7:00 amWashington, D.C. Reagan-National
19h 01m
1 stop
SEA11:01 pmSeattle/Tacoma Intl
Sep 8
SEA6:12 amSeattle/Tacoma Intl
7h 47m
1 stop
DCA4:59 pmWashington, D.C. Reagan-National
$254
Find similar
Frontier
Sep 3
DCA7:00 amWashington, D.C. Reagan-National
19h 01m
1 stop
SEA11:01 pmSeattle/Tacoma Intl
Sep 8
SEA6:12 amSeattle/Tacoma Intl
12h 47m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
$255
Find similar

Southwest flights from Washington, D.C. Reagan-National Airport to Seattle

Our best Southwest deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets
Southwest
Sep 17
DCA4:30 pmWashington, D.C. Reagan-National
9h 40m
2 stops
SEA11:10 pmSeattle/Tacoma Intl
Sep 24
SEA5:35 amSeattle/Tacoma Intl
9h 40m
1 stop
DCA6:15 pmWashington, D.C. Reagan-National
$282
Find similar
Southwest
Sep 23
DCA4:40 pmWashington, D.C. Reagan-National
9h 30m
2 stops
SEA11:10 pmSeattle/Tacoma Intl
Oct 7
SEA7:10 amSeattle/Tacoma Intl
10h 40m
2 stops
DCA8:50 pmWashington, D.C. Reagan-National
$287
Find similar
Southwest
Sep 26
DCA4:40 pmWashington, D.C. Reagan-National
10h 35m
2 stops
SEA12:15 amSeattle/Tacoma Intl
Sep 30
SEA11:10 pmSeattle/Tacoma Intl
7h 50m
1 stop
DCA10:00 amWashington, D.C. Reagan-National
$292
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Reagan-National Airport 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 August 20, 2025.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 11/7

7:00 am-12:13 pm

1 stop8h 13m

Seattle/Tacoma Intl

Wed 11/12

1:52 pm-9:59 pm

Nonstop5h 07m

$254

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 11/1

7:00 am-12:13 pm

1 stop8h 13m

Seattle/Tacoma Intl

Wed 11/5

8:49 am-4:53 pm

Nonstop5h 04m

$255

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 8/30

6:00 pm-9:34 am

1 stop18h 34m

Seattle/Tacoma Intl

Sun 9/7

6:12 am-12:10 pm

1 stop26h 58m

$256

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 10/8

7:00 am-12:07 pm

1 stop8h 07m

Seattle/Tacoma Intl

Mon 10/13

8:43 pm-9:59 pm

1 stop22h 16m

$257

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 8/30

1:00 pm-8:51 pm

1 stop10h 51m

Seattle/Tacoma Intl

Wed 9/3

6:41 am-9:59 pm

1 stop12h 18m

$258

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 9/13

5:06 pm-7:56 pm

Nonstop5h 50m

Seattle/Tacoma Intl

Mon 9/15

6:12 am-4:59 pm

1 stop7h 47m

$259

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 11/1

5:00 pm-8:03 pm

Nonstop6h 03m

Seattle/Tacoma Intl

Thu 11/6

1:52 pm-9:59 pm

Nonstop5h 07m

$277

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 11/5

8:59 am-5:05 pm

1 stop11h 06m

Seattle/Tacoma Intl

Mon 11/17

8:05 am-8:00 pm

1 stop8h 55m

$296

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 9/17

11:59 am-6:13 pm

1 stop9h 14m

Seattle/Tacoma Intl

Fri 12/12

11:45 am-11:24 pm

1 stop8h 39m

$297

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 12/15

5:00 pm-8:13 pm

Nonstop6h 13m

Seattle/Tacoma Intl

Wed 1/7

1:45 pm-9:55 pm

Nonstop5h 10m

$307

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. Reagan-National Airport 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. Reagan-National Airport to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $377. If you don’t want to visit Seattle in September, then you should wait until August to fly from Washington, D.C. Reagan-National Airport, when ticket prices are also cheap, with an average price of $414.

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. Reagan-National Airport 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. Reagan-National Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $569.

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

Flying to Seattle from Washington, D.C. Reagan-National Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $419 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $517. 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. Reagan-National to Seattle/Tacoma Intl flight route?

Fly from Washington, D.C. Reagan-National to Seattle/Tacoma Intl for the best Washington, D.C. Reagan-National - 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. Reagan-National Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $451 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. Reagan-National Airport for as low as $367 on momondo.

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

There are 4 cabin classes available to choose from on Washington, D.C. Reagan-National 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. Reagan-National Airport to Seattle flight prices changed over time?

As of August 2025, prices for Washington, D.C. Reagan-National Airport to Seattle flights are approximately 4% cheaper when compared to flights at the same time last year.

When to book flights from Washington, D.C. Reagan-National Airport to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Reagan-National Airport 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. Reagan-National Airport to Seattle (DCA to SEA) flight deals and tips

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

Best Price Found

$214

Fastest flight time

5h 41m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Washington, D.C. Reagan-National Airport in the past 72 hours is $214. The best round-trip flight deal from Washington, D.C. Reagan-National Airport to Seattle found on momondo in the last 72 hours is $307.
The fastest flight from Washington, D.C. Reagan-National Airport to Seattle takes 5h 41m
Direct flights go from Washington, D.C. Reagan-National Airport to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
Search flight deals

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

    There are 2322.2 mi between Washington, D.C. Reagan-National and Seattle/Tacoma Intl. Typically, this will take 5h 50m by plane in normal conditions.

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Washington, D.C. Reagan-National Airport to Seattle/Tacoma Intl Airport.

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

    The travel and health documents required for your trip to Seattle/Tacoma 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 Seattle/Tacoma 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 Washington, D.C. Reagan-National Airport to Seattle?

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

Best airlines flying from Washington, D.C. Reagan-National Airport to Seattle

Compare and see reviews for airlines that fly from Washington, D.C. Reagan-National Airport to Seattle with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $137Free CancellationRating
5.8
3,207 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $178Free CancellationRating
7.8
2,668 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $248Free CancellationRating
7.9
7,982 reviews
Search Delta flights
American AirlinesPriceFrom $276Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $282Free CancellationRating
7.4
8,928 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $287Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $306Free CancellationRating
8.0
4,246 reviews
Search Southwest flights

  • Alaska Airlines Flights From Washington, D.C. Reagan-National Airport to Seattle

    Across 3 Alaska Airlines flights from Washington, D.C. Reagan-National Airport to Seattle this week, the average price was $538, with the best Alaska Airlines deals starting from $287 round-trip. 10,000 users have rated Alaska Airlines on momondo, with an average score of 8.0/10.

  • Delta Flights From Washington, D.C. Reagan-National Airport to Seattle

    The best Delta deal for Washington, D.C. Reagan-National Airport to Seattle flight tickets found on momondo in the last 72 hours was $248, round-trip. It should be noted that an average Delta flight deal for this route in this time was higher, at $419 round-trip. Delta operates 7 flights out of Washington, D.C. Reagan-National Airport into Seattle in an average week, so prices vary by time and availability. 7,982 Delta reviews by users on momondo have scored the airline at 7.9/10.

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
Lynnwood
Federal Way
Marysville
Puyallup
Tukwila
Kirkland
Lakewood
Centralia
Cle Elum
Shoreline
Fife
Redmond
Westport

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington, D.C. to Seattle. momondo saves you time and could save you money on your trip.

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

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

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

Once all potential Washington, D.C. to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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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