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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from $120

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 3/31. 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
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
Frontier Logo
6:00 pm - 10:55 am
DCA
-
SEA
19h 55m
1 stop
Frontier Logo
6:30 pm - 1:15 pm
SEA
-
DCA
15h 45m
2 stops
$201Frontier
Sat, Feb 14 - Tue, Feb 17
Frontier Logo
6:00 pm - 10:55 am
DCA
-
SEA
19h 55m
1 stop
Frontier Logo
1:16 pm - 1:15 pm
SEA
-
DCA
20h 59m
1 stop
$202Frontier
Sat, Feb 14 - Sat, Feb 21
Frontier Logo
2:00 pm - 12:01 pm
DCA
-
SEA
25h 01m
1 stop
Frontier Logo
12:24 pm - 1:02 pm
SEA
-
DCA
21h 38m
1 stop
$204Frontier
Fri, Feb 27 - Fri, Mar 6
Frontier Logo
2:00 pm - 10:55 am
DCA
-
SEA
23h 55m
1 stop
Frontier Logo
6:30 pm - 1:15 pm
SEA
-
DCA
15h 45m
2 stops
$209Frontier
Sat, Feb 14 - Tue, Feb 17
Multiple Airlines Logo
6:00 pm - 10:55 am
DCA
-
SEA
19h 55m
1 stop
Multiple Airlines Logo
1:56 pm - 9:59 pm
SEA
-
DCA
5h 03mnonstop
$210Multiple Airlines
Sat, Feb 14 - Fri, Feb 20
Hawaiian Airlines Logo
5:09 pm - 10:28 pm
DCA
-
SEA
8h 19m
1 stop
Hawaiian Airlines Logo
1:56 pm - 9:59 pm
SEA
-
DCA
5h 03mnonstop
$213Hawaiian Airlines
Sat, Feb 7 - Sat, Feb 14
Frontier Logo
8:00 am - 8:13 am
DCA
-
SEA
27h 13m
2 stops
Frontier Logo
12:00 pm - 1:00 pm
SEA
-
DCA
22h 00m
1 stop
$214Frontier
Wed, Feb 25 - Fri, Feb 27
Multiple Airlines Logo
8:00 am - 11:10 am
DCA
-
SEA
6h 10mnonstop
Multiple Airlines Logo
1:16 pm - 1:15 pm
SEA
-
DCA
20h 59m
1 stop
$215Multiple Airlines
Sat, Feb 14 - Sat, Feb 21

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
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

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
Mar 24
DCA7:30 amWashington, D.C. Reagan-National
8h 15m
1 stop
SEA12:45 pmSeattle/Tacoma Intl
Mar 26
SEA11:55 pmSeattle/Tacoma Intl
12h 00m
1 stop
DCA2:55 pmWashington, D.C. Reagan-National
$225
Southwest
Mar 14
DCA6:50 pmWashington, D.C. Reagan-National
9h 30m
1 stop
SEA1:20 amSeattle/Tacoma Intl
Mar 18
SEA5:30 amSeattle/Tacoma Intl
7h 50m
1 stop
DCA4:20 pmWashington, D.C. Reagan-National
$268
Southwest
Jan 25
DCA6:00 amWashington, D.C. Reagan-National
11h 05m
2 stops
SEA2:05 pmSeattle/Tacoma Intl
Jan 28
SEA9:55 amSeattle/Tacoma Intl
10h 00m
2 stops
DCA10:55 pmWashington, D.C. Reagan-National
$718

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 January 15, 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

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

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 2/14

6:00 pm-10:55 am

1 stop19h 55m

Seattle/Tacoma Intl

Tue 2/17

6:30 pm-1:15 pm

2 stops15h 45m

$201

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 2/14

6:00 pm-10:55 am

1 stop19h 55m

Seattle/Tacoma Intl

Sat 2/21

1:16 pm-1:15 pm

1 stop20h 59m

$202

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 2/27

2:00 pm-12:01 pm

1 stop25h 01m

Seattle/Tacoma Intl

Fri 3/6

12:24 pm-1:02 pm

1 stop21h 38m

$204

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 2/14

2:00 pm-10:55 am

1 stop23h 55m

Seattle/Tacoma Intl

Tue 2/17

6:30 pm-1:15 pm

2 stops15h 45m

$209

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 2/14

6:00 pm-10:55 am

1 stop19h 55m

Seattle/Tacoma Intl

Fri 2/20

1:56 pm-9:59 pm

Nonstop5h 03m

$210

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 2/7

5:09 pm-10:28 pm

1 stop8h 19m

Seattle/Tacoma Intl

Sat 2/14

1:56 pm-9:59 pm

Nonstop5h 03m

$213

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 2/25

8:00 am-8:13 am

2 stops27h 13m

Seattle/Tacoma Intl

Fri 2/27

12:00 pm-1:00 pm

1 stop22h 00m

$214

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 2/14

8:00 am-11:10 am

Nonstop6h 10m

Seattle/Tacoma Intl

Sat 2/21

1:16 pm-1:15 pm

1 stop20h 59m

$215

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, January 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 January, then you should wait until September to fly from Washington, D.C. Reagan-National Airport, when ticket prices are also cheap, with an average price of $362.

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 $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. Reagan-National Airport 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. Reagan-National Airport 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. 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 $423 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 $332 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 8% 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 January 2026, prices for Washington, D.C. Reagan-National Airport to Seattle flights are approximately 8% 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

$185

Fastest flight time

5h 51m

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 $185. The best round-trip flight deal from Washington, D.C. Reagan-National Airport to Seattle found on momondo in the last 72 hours is $275.
The fastest flight from Washington, D.C. Reagan-National Airport to Seattle takes 5h 51m
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 51m 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
3,056 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $168Free CancellationRating
7.8
2,827 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $179Free CancellationRating
7.9
8,048 reviews
Search Delta flights
SouthwestPriceFrom $218Free CancellationRating
8.0
4,258 reviews
Search Southwest flights
United AirlinesPriceFrom $238Free CancellationRating
7.4
9,163 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $275Free CancellationRating
8.0
11,713 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $281Free CancellationRating
7.2
11,129 reviews
Search American Airlines flights

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

    Across 7 Alaska Airlines flights from Washington, D.C. Reagan-National Airport to Seattle this week, the average price was $525, with the best Alaska Airlines deals starting from $275 round-trip. 11,713 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 $388 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. 8,048 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
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?

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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