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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 5/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

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
7:00 am - 2:01 pm
DCA
-
SEA
10h 01m
1 stop
Frontier Logo
7:50 pm - 9:58 pm
SEA
-
DCA
23h 08m
1 stop
$241Frontier
Fri, May 29 - Thu, Jun 4
Frontier Logo
7:00 am - 9:49 am
DCA
-
SEA
29h 49m
1 stop
Frontier Logo
6:52 pm - 12:59 pm
SEA
-
DCA
15h 07m
1 stop
$243Frontier
Tue, May 12 - Sat, May 16
Frontier Logo
6:00 pm - 9:49 am
DCA
-
SEA
18h 49m
1 stop
Frontier Logo
7:50 pm - 9:58 pm
SEA
-
DCA
23h 08m
1 stop
$245Frontier
Mon, May 4 - Tue, May 12
Frontier Logo
7:00 am - 2:01 pm
DCA
-
SEA
10h 01m
1 stop
Frontier Logo
7:50 pm - 12:59 pm
SEA
-
DCA
14h 09m
1 stop
$250Frontier
Fri, May 29 - Tue, Jun 2
Frontier Logo
7:00 am - 2:01 pm
DCA
-
SEA
10h 01m
1 stop
Frontier Logo
7:50 pm - 12:59 pm
SEA
-
DCA
14h 09m
1 stop
$251Frontier
Fri, May 29 - Thu, Jun 4
Frontier Logo
1:59 pm - 9:49 am
DCA
-
SEA
22h 50m
1 stop
Frontier Logo
7:50 pm - 9:58 pm
SEA
-
DCA
23h 08m
1 stop
$252Frontier
Sat, May 9 - Mon, May 11
Frontier Logo
7:00 am - 2:01 pm
DCA
-
SEA
10h 01m
1 stop
Frontier Logo
7:50 pm - 12:59 pm
SEA
-
DCA
14h 09m
1 stop
$255Frontier
Thu, May 28 - Fri, Jun 5
Frontier Logo
7:00 am - 2:01 pm
DCA
-
SEA
10h 01m
1 stop
Frontier Logo
7:50 pm - 12:59 pm
SEA
-
DCA
14h 09m
1 stop
$256Frontier
Thu, May 28 - Thu, Jun 4
Frontier Logo
7:00 am - 2:01 pm
DCA
-
SEA
10h 01m
1 stop
Frontier Logo
7:50 pm - 9:58 pm
SEA
-
DCA
23h 08m
1 stop
$257Frontier
Thu, May 28 - Thu, Jun 4
Frontier Logo
7:00 am - 9:49 am
DCA
-
SEA
29h 49m
1 stop
Frontier Logo
7:50 pm - 9:58 pm
SEA
-
DCA
23h 08m
1 stop
$258Frontier
Wed, May 6 - Mon, Jun 1

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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
May 29
DCA7:00 amWashington, D.C. Reagan-National
10h 01m
1 stop
SEA2:01 pmSeattle/Tacoma Intl
Jun 4
SEA7:50 pmSeattle/Tacoma Intl
23h 08m
1 stop
DCA9:58 pmWashington, D.C. Reagan-National
$241
Frontier
May 12
DCA7:00 amWashington, D.C. Reagan-National
29h 49m
1 stop
SEA9:49 amSeattle/Tacoma Intl
May 16
SEA6:52 pmSeattle/Tacoma Intl
15h 07m
1 stop
DCA12:59 pmWashington, D.C. Reagan-National
$243
Frontier
May 4
DCA6:00 pmWashington, D.C. Reagan-National
18h 49m
1 stop
SEA9:49 amSeattle/Tacoma Intl
May 12
SEA7:50 pmSeattle/Tacoma Intl
23h 08m
1 stop
DCA9:58 pmWashington, D.C. Reagan-National
$245

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

Our best American Airlines deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets
American Airlines
Jul 21
DCA5:00 amWashington, D.C. Reagan-National
7h 47m
1 stop
SEA9:47 amSeattle/Tacoma Intl
Jul 21
SEA11:56 pmSeattle/Tacoma Intl
7h 07m
1 stop
DCA10:03 amWashington, D.C. Reagan-National
$295
American Airlines
Jun 1
DCA5:00 amWashington, D.C. Reagan-National
7h 50m
1 stop
SEA9:50 amSeattle/Tacoma Intl
Jun 3
SEA1:10 pmSeattle/Tacoma Intl
7h 44m
1 stop
DCA11:54 pmWashington, D.C. Reagan-National
$300

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 April 20, 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

Fri 5/29

7:00 am-2:01 pm

1 stop10h 01m

Seattle/Tacoma Intl

Thu 6/4

7:50 pm-9:58 pm

1 stop23h 08m

$241

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 5/12

7:00 am-9:49 am

1 stop29h 49m

Seattle/Tacoma Intl

Sat 5/16

6:52 pm-12:59 pm

1 stop15h 07m

$243

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 5/4

6:00 pm-9:49 am

1 stop18h 49m

Seattle/Tacoma Intl

Tue 5/12

7:50 pm-9:58 pm

1 stop23h 08m

$245
Quickest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 5/29

7:00 am-2:01 pm

1 stop10h 01m

Seattle/Tacoma Intl

Tue 6/2

7:50 pm-12:59 pm

1 stop14h 09m

$250

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 5/29

7:00 am-2:01 pm

1 stop10h 01m

Seattle/Tacoma Intl

Thu 6/4

7:50 pm-12:59 pm

1 stop14h 09m

$251

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 5/9

1:59 pm-9:49 am

1 stop22h 50m

Seattle/Tacoma Intl

Mon 5/11

7:50 pm-9:58 pm

1 stop23h 08m

$252

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 5/28

7:00 am-2:01 pm

1 stop10h 01m

Seattle/Tacoma Intl

Fri 6/5

7:50 pm-12:59 pm

1 stop14h 09m

$255

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 5/28

7:00 am-2:01 pm

1 stop10h 01m

Seattle/Tacoma Intl

Thu 6/4

7:50 pm-12:59 pm

1 stop14h 09m

$256

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 5/28

7:00 am-2:01 pm

1 stop10h 01m

Seattle/Tacoma Intl

Thu 6/4

7:50 pm-9:58 pm

1 stop23h 08m

$257

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 5/6

7:00 am-9:49 am

1 stop29h 49m

Seattle/Tacoma Intl

Mon 6/1

7:50 pm-9:58 pm

1 stop23h 08m

$258

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 typical price of a round-trip flight between Washington, D.C. Reagan-National Airport and Seattle?

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 $293. 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 $440. 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 $575.

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

Flying to Seattle from Washington, D.C. Reagan-National Airport at noon is the least expensive time of day to depart. momondo users have found prices as low as $445 when looking at flights departing at noon. Flights to Seattle are more costly in the evening, with an average ticket price of $497. Departure times in the evening 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 $350 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 1% 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 April 2026, prices for Washington, D.C. Reagan-National Airport to Seattle flights are approximately 31% 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

$257

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 $257. The best round-trip flight deal from Washington, D.C. Reagan-National Airport to Seattle found on momondo in the last 72 hours is $431.
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

Frequently asked questions about flying from Washington, D.C. Reagan-National Airport to Seattle

  • 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
5.6
2,983 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $168Free CancellationRating
7.8
2,837 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $178Free CancellationRating
7.9
8,422 reviews
Search Delta flights
United AirlinesPriceFrom $208Free CancellationRating
7.4
9,607 reviews
Search United Airlines flights
American AirlinesPriceFrom $216Free CancellationRating
7.1
11,628 reviews
Search American Airlines flights
SouthwestPriceFrom $218Free CancellationRating
8.0
4,330 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $263Free CancellationRating
7.9
12,266 reviews
Search Alaska Airlines flights

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

    Across 7 Delta flights from Washington, D.C. Reagan-National Airport to Seattle this week, the average price was $361, with the best Delta deals starting from $178 round-trip. 8,422 users have rated Delta on momondo, with an average score of 7.9/10.

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

    The best Alaska Airlines deal for Washington, D.C. Reagan-National Airport to Seattle flight tickets found on momondo in the last 72 hours was $263, round-trip. It should be noted that an average Alaska Airlines flight deal for this route in this time was higher, at $521 round-trip. Alaska Airlines operates 5 flights out of Washington, D.C. Reagan-National Airport into Seattle in an average week, so prices vary by time and availability. 12,266 Alaska Airlines 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
Redmond
Kent
Marysville
Tukwila
Puyallup
Lakewood
Cle Elum
Federal Way
Centralia
Fife
Shoreline
Westport
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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