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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from $132

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 1/17. 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

Cheap round-trip flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
5:00 pm - 8:11 pmDCA-SEA
6h 11mnonstop
Alaska Airlines Logo
7:10 am - 9:02 pmSEA-DCA
10h 52m1 stop
$241Alaska Airlines
Find Deal
sáb., feb. 14 - sáb., feb. 21
Southwest Logo
2:15 pm - 9:05 pmDCA-SEA
9h 50m2 stops
Southwest Logo
6:05 am - 8:15 pmSEA-DCA
11h 10m2 stops
$242Southwest
Find Deal
sáb., ene. 24 - mar., ene. 27
American Airlines Logo
1:44 pm - 7:04 pmDCA-SEA
8h 20m1 stop
American Airlines Logo
7:00 am - 5:47 pmSEA-DCA
7h 47m1 stop
$243American Airlines
Find Deal
jue., feb. 5 - dom., feb. 8
Delta Logo
4:44 pm - 7:43 pmDCA-SEA
5h 59mnonstop
Delta Logo
7:20 am - 3:20 pmSEA-DCA
5h 00mnonstop
$244Delta
Find Deal
lun., ene. 19 - vie., ene. 23
Alaska Airlines Logo
5:09 pm - 10:33 pmDCA-SEA
8h 24m1 stop
Alaska Airlines Logo
1:55 pm - 9:59 pmSEA-DCA
5h 04mnonstop
$245Alaska Airlines
Find Deal
vie., feb. 6 - mar., feb. 10
Southwest Logo
2:45 pm - 11:05 pmDCA-SEA
11h 20m2 stops
Southwest Logo
6:45 am - 6:20 pmSEA-DCA
8h 35m1 stop
$248Southwest
Find Deal
mar., ene. 6 - vie., ene. 9
Delta Logo
6:05 am - 10:42 amDCA-SEA
7h 37m1 stop
Delta Logo
7:20 am - 3:20 pmSEA-DCA
5h 00mnonstop
$249Delta
Find Deal
jue., ene. 8 - dom., ene. 11
Frontier Logo
6:00 pm - 1:34 pmDCA-SEA
22h 34m1 stop
Frontier Logo
12:26 pm - 1:01 pmSEA-DCA
21h 35m1 stop
$253Frontier
Find Deal
vie., ene. 9 - dom., ene. 11
Frontier Logo
2:00 pm - 12:30 pmDCA-SEA
25h 30m1 stop
Frontier Logo
12:19 pm - 1:02 pmSEA-DCA
21h 43m1 stop
$254Frontier
Find Deal
jue., dic. 18 - jue., ene. 15
Frontier Logo
8:00 am - 1:54 pmDCA-SEA
32h 54m2 stops
Frontier Logo
12:26 pm - 1:01 pmSEA-DCA
21h 35m1 stop
$255Frontier
Find Deal
dom., ene. 4 - dom., ene. 11

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
Jan 9
DCA6:00 pmWashington, D.C. Reagan-National
22h 34m
1 stop
SEA1:34 pmSeattle/Tacoma Intl
Jan 11
SEA12:26 pmSeattle/Tacoma Intl
21h 35m
1 stop
DCA1:01 pmWashington, D.C. Reagan-National
$253
Find similar
Frontier
Dec 18
DCA2:00 pmWashington, D.C. Reagan-National
25h 30m
1 stop
SEA12:30 pmSeattle/Tacoma Intl
Jan 15
SEA12:19 pmSeattle/Tacoma Intl
21h 43m
1 stop
DCA1:02 pmWashington, D.C. Reagan-National
$254
Find similar
Frontier
Jan 4
DCA8:00 amWashington, D.C. Reagan-National
32h 54m
2 stops
SEA1:54 pmSeattle/Tacoma Intl
Jan 11
SEA12:26 pmSeattle/Tacoma Intl
21h 35m
1 stop
DCA1:01 pmWashington, D.C. Reagan-National
$255
Find similar

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

Our best Delta deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets
Delta
Jan 8
DCA4:44 pmWashington, D.C. Reagan-National
5h 59m
SEA7:43 pmSeattle/Tacoma Intl
Jan 10
SEA9:45 pmSeattle/Tacoma Intl
9h 43m
1 stop
DCA10:28 amWashington, D.C. Reagan-National
$238
Find similar
Delta
Jan 19
DCA4:44 pmWashington, D.C. Reagan-National
5h 59m
SEA7:43 pmSeattle/Tacoma Intl
Jan 23
SEA7:20 amSeattle/Tacoma Intl
5h 00m
DCA3:20 pmWashington, D.C. Reagan-National
$244
Find similar
Delta
Jan 8
DCA6:05 amWashington, D.C. Reagan-National
7h 37m
1 stop
SEA10:42 amSeattle/Tacoma Intl
Jan 11
SEA7:20 amSeattle/Tacoma Intl
5h 00m
DCA3:20 pmWashington, D.C. Reagan-National
$249
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 diciembre 2, 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

sáb. 2/14

5:00 pm-8:11 pm

Nonstop6h 11m

Seattle/Tacoma Intl

sáb. 2/21

7:10 am-9:02 pm

1 stop10h 52m

$241

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

sáb. 1/24

2:15 pm-9:05 pm

2 stops9h 50m

Seattle/Tacoma Intl

mar. 1/27

6:05 am-8:15 pm

2 stops11h 10m

$242

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

jue. 2/5

1:44 pm-7:04 pm

1 stop8h 20m

Seattle/Tacoma Intl

dom. 2/8

7:00 am-5:47 pm

1 stop7h 47m

$243

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

lun. 1/19

4:44 pm-7:43 pm

Nonstop5h 59m

Seattle/Tacoma Intl

vie. 1/23

7:20 am-3:20 pm

Nonstop5h 00m

$244

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

vie. 2/6

5:09 pm-10:33 pm

1 stop8h 24m

Seattle/Tacoma Intl

mar. 2/10

1:55 pm-9:59 pm

Nonstop5h 04m

$245

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

mar. 1/6

2:45 pm-11:05 pm

2 stops11h 20m

Seattle/Tacoma Intl

vie. 1/9

6:45 am-6:20 pm

1 stop8h 35m

$248

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

jue. 1/8

6:05 am-10:42 am

1 stop7h 37m

Seattle/Tacoma Intl

dom. 1/11

7:20 am-3:20 pm

Nonstop5h 00m

$249

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

vie. 1/9

6:00 pm-1:34 pm

1 stop22h 34m

Seattle/Tacoma Intl

dom. 1/11

12:26 pm-1:01 pm

1 stop21h 35m

$253

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

jue. 12/18

2:00 pm-12:30 pm

1 stop25h 30m

Seattle/Tacoma Intl

jue. 1/15

12:19 pm-1:02 pm

1 stop21h 43m

$254

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

dom. 1/4

8:00 am-1:54 pm

2 stops32h 54m

Seattle/Tacoma Intl

dom. 1/11

12:26 pm-1:01 pm

1 stop21h 35m

$255

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 $364. If you don’t want to visit Seattle in September, then you should wait until May to fly from Washington, D.C. Reagan-National Airport, when ticket prices are also cheap, with an average price of $407.

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 $439. 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 $583.

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 $518. 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 $452 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.

Can stopping save me money on Washington, D.C. Reagan-National Airport to Seattle flights?

You could potentially save up to 31% on your flight if you consider stops on a Washington, D.C. Reagan-National Airport to Seattle flight.

How have Washington, D.C. Reagan-National Airport to Seattle flight prices changed over time?

As of December 2025, prices for Washington, D.C. Reagan-National Airport to Seattle flights are approximately 11% 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

$203

Fastest flight time

5h 39m

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 $203. The best round-trip flight deal from Washington, D.C. Reagan-National Airport to Seattle found on momondo in the last 72 hours is $400.
The fastest flight from Washington, D.C. Reagan-National Airport to Seattle takes 5h 39m
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 55m 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 $143Free CancellationRating
5.8
3,094 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $178Free CancellationRating
7.8
2,815 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $206Free CancellationRating
7.9
8,013 reviews
Search Delta flights
United AirlinesPriceFrom $248Free CancellationRating
7.4
9,063 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $282Free CancellationRating
8.0
11,386 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $291Free CancellationRating
7.2
11,043 reviews
Search American Airlines flights
SouthwestPriceFrom $332Free CancellationRating
8.0
4,253 reviews
Search Southwest flights

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

    Across 9 Alaska Airlines flights from Washington, D.C. Reagan-National Airport to Seattle this week, the average price was $540, with the best Alaska Airlines deals starting from $282 round-trip. 11,386 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 $206, round-trip. It should be noted that an average Delta flight deal for this route in this time was higher, at $406 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. 8,013 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
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Puyallup
Marysville
Tukwila
Redmond
Cle Elum
Federal Way
Lakewood
Fife
Centralia
Westport
Kirkland
Shoreline

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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