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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from $123

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 4/23. 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.
Frontier Logo
8:00 am - 9:27 am
DCA
-
SEA
28h 27m
1 stop
Frontier Logo
10:57 am - 1:00 pm
SEA
-
DCA
23h 03m
2 stops
$198Frontier
Wed, Apr 22 - Wed, Apr 29
Southwest Logo
7:00 pm - 12:10 am
DCA
-
SEA
8h 10m
1 stop
Southwest Logo
6:00 am - 4:15 pm
SEA
-
DCA
7h 15m
1 stop
$199Southwest
Wed, Apr 22 - Wed, Apr 29
Frontier Logo
6:00 pm - 9:52 am
DCA
-
SEA
18h 52m
1 stop
Frontier Logo
7:12 pm - 1:00 pm
SEA
-
DCA
14h 48m
1 stop
$200Frontier
Thu, Apr 16 - Sun, Apr 19
Frontier Logo
7:00 am - 9:27 am
DCA
-
SEA
29h 27m
1 stop
Frontier Logo
4:20 pm - 9:59 pm
SEA
-
DCA
26h 39m
1 stop
$202Frontier
Mon, Apr 13 - Thu, Apr 16
Southwest Logo
3:35 pm - 11:55 pm
DCA
-
SEA
11h 20m
1 stop
Southwest Logo
11:45 pm - 11:10 am
SEA
-
DCA
8h 25m
1 stop
$204Southwest
Wed, Apr 1 - Wed, Apr 8
Frontier Logo
6:00 pm - 11:37 am
DCA
-
SEA
20h 37m
1 stop
Frontier Logo
7:12 pm - 4:59 pm
SEA
-
DCA
18h 47m
1 stop
$205Frontier
Sun, Apr 5 - Tue, Apr 14
Frontier Logo
8:00 am - 3:05 pm
DCA
-
SEA
10h 05m
1 stop
Frontier Logo
4:20 pm - 1:00 pm
SEA
-
DCA
17h 40m
1 stop
$206Frontier
Thu, Apr 16 - Sun, Apr 19
Frontier Logo
6:00 pm - 11:37 am
DCA
-
SEA
20h 37m
1 stop
Frontier Logo
7:12 pm - 9:59 pm
SEA
-
DCA
23h 47m
1 stop
$207Frontier
Sun, Apr 5 - Mon, Apr 20
Southwest Logo
4:50 pm - 11:55 pm
DCA
-
SEA
10h 05m
2 stops
Southwest Logo
6:50 am - 8:50 pm
SEA
-
DCA
11h 00m
2 stops
$209Southwest
Tue, Apr 21 - Tue, Apr 28
Southwest Logo
7:45 pm - 8:40 am
DCA
-
SEA
15h 55m
2 stops
Southwest Logo
5:15 am - 4:35 pm
SEA
-
DCA
8h 20m
1 stop
$210Southwest
Mon, Apr 20 - Fri, Apr 24

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

Our best United Airlines deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets
United Airlines
Apr 1
DCA11:55 amWashington, D.C. Reagan-National
10h 05m
1 stop
SEA7:00 pmSeattle/Tacoma Intl
Apr 8
SEA11:59 pmSeattle/Tacoma Intl
7h 00m
1 stop
DCA9:59 amWashington, D.C. Reagan-National
$229
United Airlines
Apr 4
DCA6:00 pmWashington, D.C. Reagan-National
8h 59m
1 stop
SEA11:59 pmSeattle/Tacoma Intl
Apr 13
SEA11:59 pmSeattle/Tacoma Intl
7h 00m
1 stop
DCA9:59 amWashington, D.C. Reagan-National
$249
United Airlines
Mar 14
DCA5:55 pmWashington, D.C. Reagan-National
10h 04m
1 stop
SEA12:59 amSeattle/Tacoma Intl
Mar 29
SEA11:59 pmSeattle/Tacoma Intl
7h 00m
1 stop
DCA9:59 amWashington, D.C. Reagan-National
$357

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
Apr 22
DCA8:00 amWashington, D.C. Reagan-National
28h 27m
1 stop
SEA9:27 amSeattle/Tacoma Intl
Apr 29
SEA10:57 amSeattle/Tacoma Intl
23h 03m
2 stops
DCA1:00 pmWashington, D.C. Reagan-National
$198
Frontier
Apr 16
DCA6:00 pmWashington, D.C. Reagan-National
18h 52m
1 stop
SEA9:52 amSeattle/Tacoma Intl
Apr 19
SEA7:12 pmSeattle/Tacoma Intl
14h 48m
1 stop
DCA1:00 pmWashington, D.C. Reagan-National
$200
Frontier
Apr 13
DCA7:00 amWashington, D.C. Reagan-National
29h 27m
1 stop
SEA9:27 amSeattle/Tacoma Intl
Apr 16
SEA4:20 pmSeattle/Tacoma Intl
26h 39m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
$202

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 March 5, 2026.
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

Cheapest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 4/22

8:00 am-9:27 am

1 stop28h 27m

Seattle/Tacoma Intl

Wed 4/29

10:57 am-1:00 pm

2 stops23h 03m

$198
Quickest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 4/22

7:00 pm-12:10 am

1 stop8h 10m

Seattle/Tacoma Intl

Wed 4/29

6:00 am-4:15 pm

1 stop7h 15m

$199

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 4/16

6:00 pm-9:52 am

1 stop18h 52m

Seattle/Tacoma Intl

Sun 4/19

7:12 pm-1:00 pm

1 stop14h 48m

$200

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 4/13

7:00 am-9:27 am

1 stop29h 27m

Seattle/Tacoma Intl

Thu 4/16

4:20 pm-9:59 pm

1 stop26h 39m

$202

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 4/1

3:35 pm-11:55 pm

1 stop11h 20m

Seattle/Tacoma Intl

Wed 4/8

11:45 pm-11:10 am

1 stop8h 25m

$204

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 4/5

6:00 pm-11:37 am

1 stop20h 37m

Seattle/Tacoma Intl

Tue 4/14

7:12 pm-4:59 pm

1 stop18h 47m

$205

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 4/16

8:00 am-3:05 pm

1 stop10h 05m

Seattle/Tacoma Intl

Sun 4/19

4:20 pm-1:00 pm

1 stop17h 40m

$206

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sun 4/5

6:00 pm-11:37 am

1 stop20h 37m

Seattle/Tacoma Intl

Mon 4/20

7:12 pm-9:59 pm

1 stop23h 47m

$207

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 4/21

4:50 pm-11:55 pm

2 stops10h 05m

Seattle/Tacoma Intl

Tue 4/28

6:50 am-8:50 pm

2 stops11h 00m

$209

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 4/20

7:45 pm-8:40 am

2 stops15h 55m

Seattle/Tacoma Intl

Fri 4/24

5:15 am-4:35 pm

1 stop8h 20m

$210

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, February 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 $306. If you don’t want to visit Seattle in February, then you should wait until January to fly from Washington, D.C. Reagan-National Airport, when ticket prices are also cheap, with an average price of $313.

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 $436. 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 $565.

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 $438 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $490. 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 $414 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 $335 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 14% 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 March 2026, prices for Washington, D.C. Reagan-National Airport to Seattle flights are approximately 8% more expensive 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

$208

Fastest flight time

5h 42m

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 $208. The best round-trip flight deal from Washington, D.C. Reagan-National Airport to Seattle found on momondo in the last 72 hours is $346.
The fastest flight from Washington, D.C. Reagan-National Airport to Seattle takes 5h 42m
Direct flights go from Washington, D.C. Reagan-National Airport to Seattle every day.
There is 1 airport in Seattle. From Washington, D.C. Reagan-National Airport there are direct flights to 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 42m 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 $119Free CancellationRating
5.7
3,041 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $168Free CancellationRating
7.8
2,836 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $179Free CancellationRating
7.9
8,250 reviews
Search Delta flights
SouthwestPriceFrom $218Free CancellationRating
8.0
4,308 reviews
Search Southwest flights
American AirlinesPriceFrom $219Free CancellationRating
7.1
11,382 reviews
Search American Airlines flights
United AirlinesPriceFrom $238Free CancellationRating
7.4
9,388 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $259Free CancellationRating
8.0
11,987 reviews
Search Alaska Airlines flights

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

    Across 4 Alaska Airlines flights from Washington, D.C. Reagan-National Airport to Seattle this week, the average price was $523, with the best Alaska Airlines deals starting from $259 round-trip. 11,987 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 $179, round-trip. It should be noted that an average Delta flight deal for this route in this time was higher, at $374 round-trip. Delta operates 4 flights out of Washington, D.C. Reagan-National Airport into Seattle in an average week, so prices vary by time and availability. 8,250 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
Marysville
Redmond
Cle Elum
Puyallup
Lakewood
Tukwila
Federal Way
Fife
Westport
Kirkland
Centralia
Tumwater

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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