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Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from $133

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 11/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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 - 12:13 pmDCA-SEA
31h 13m1 stop
Frontier Logo
1:37 pm - 9:59 pmSEA-DCA
29h 22m1 stop
$235Frontier
Find Deal
Tue, Oct 28 - Tue, Nov 18
Hawaiian Airlines Logo
5:00 pm - 8:03 pmDCA-SEA
6h 03mnonstop
Hawaiian Airlines Logo
5:20 am - 4:00 pmSEA-DCA
7h 40m1 stop
$236Hawaiian Airlines
Find Deal
Sat, Nov 1 - Sat, Nov 8
Hawaiian Airlines Logo
5:00 pm - 8:03 pmDCA-SEA
6h 03mnonstop
Hawaiian Airlines Logo
5:20 am - 4:00 pmSEA-DCA
7h 40m1 stop
$237Hawaiian Airlines
Find Deal
Sat, Nov 1 - Sat, Nov 8
Alaska Airlines Logo
5:08 pm - 10:45 pmDCA-SEA
8h 37m1 stop
Alaska Airlines Logo
8:05 am - 8:00 pmSEA-DCA
8h 55m1 stop
$238Alaska Airlines
Find Deal
Tue, Dec 9 - Sat, Dec 13
Alaska Airlines Logo
5:00 pm - 8:03 pmDCA-SEA
6h 03mnonstop
Alaska Airlines Logo
1:52 pm - 9:59 pmSEA-DCA
5h 07mnonstop
$239Alaska Airlines
Find Deal
Sat, Nov 1 - Tue, Nov 11
Delta Logo
4:59 pm - 7:50 pmDCA-SEA
5h 51mnonstop
Delta Logo
7:25 am - 3:28 pmSEA-DCA
5h 03mnonstop
$241Delta
Find Deal
Sat, Nov 1 - Sat, Nov 8
Delta Logo
2:28 pm - 8:19 pmDCA-SEA
8h 51m1 stop
Delta Logo
7:25 am - 3:28 pmSEA-DCA
5h 03mnonstop
$249Delta
Find Deal
Sat, Nov 1 - Sat, Nov 8
American Airlines Logo
1:45 pm - 8:37 pmDCA-SEA
9h 52m1 stop
American Airlines Logo
12:31 am - 10:50 amSEA-DCA
7h 19m1 stop
$253American Airlines
Find Deal
Fri, Dec 5 - Fri, Dec 5
American Airlines Logo
3:25 pm - 10:56 pmDCA-SEA
10h 31m1 stop
American Airlines Logo
12:34 am - 11:00 amSEA-DCA
7h 26m1 stop
$271American Airlines
Find Deal
Sat, Oct 25 - Sat, Oct 25
United Airlines Logo
1:00 pm - 6:52 pmDCA-SEA
8h 52m1 stop
United Airlines Logo
11:30 pm - 10:53 amSEA-DCA
8h 23m1 stop
$277United Airlines
Find Deal
Thu, Oct 30 - Sun, Nov 9

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
Oct 28
DCA8:00 amWashington, D.C. Reagan-National
31h 13m
1 stop
SEA12:13 pmSeattle/Tacoma Intl
Nov 18
SEA1:37 pmSeattle/Tacoma Intl
29h 22m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
$235
Find similar
Frontier
Oct 28
DCA8:00 amWashington, D.C. Reagan-National
31h 13m
1 stop
SEA12:13 pmSeattle/Tacoma Intl
Nov 8
SEA12:58 pmSeattle/Tacoma Intl
20h 06m
1 stop
DCA12:04 pmWashington, D.C. Reagan-National
$240
Find similar
Frontier
Oct 28
DCA8:00 amWashington, D.C. Reagan-National
31h 13m
1 stop
SEA12:13 pmSeattle/Tacoma Intl
Oct 31
SEA9:22 pmSeattle/Tacoma Intl
21h 37m
2 stops
DCA9:59 pmWashington, D.C. Reagan-National
$243
Find similar

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

Our best Hawaiian Airlines deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets
Hawaiian Airlines
Nov 1
DCA5:00 pmWashington, D.C. Reagan-National
6h 03m
SEA8:03 pmSeattle/Tacoma Intl
Nov 8
SEA5:20 amSeattle/Tacoma Intl
7h 40m
1 stop
DCA4:00 pmWashington, D.C. Reagan-National
$236
Find similar
Hawaiian Airlines
Nov 1
DCA5:00 pmWashington, D.C. Reagan-National
6h 03m
SEA8:03 pmSeattle/Tacoma Intl
Nov 8
SEA5:20 amSeattle/Tacoma Intl
7h 40m
1 stop
DCA4:00 pmWashington, D.C. Reagan-National
$237
Find similar
Hawaiian Airlines
Nov 1
DCA5:53 pmWashington, D.C. Reagan-National
8h 39m
1 stop
SEA11:32 pmSeattle/Tacoma Intl
Nov 8
SEA5:20 amSeattle/Tacoma Intl
7h 40m
1 stop
DCA4:00 pmWashington, D.C. Reagan-National
$245
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 October 5, 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

Tue 10/28

8:00 am-12:13 pm

1 stop31h 13m

Seattle/Tacoma Intl

Tue 11/18

1:37 pm-9:59 pm

1 stop29h 22m

$235

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

Sat 11/8

5:20 am-4:00 pm

1 stop7h 40m

$236

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

Sat 11/8

5:20 am-4:00 pm

1 stop7h 40m

$237

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 12/9

5:08 pm-10:45 pm

1 stop8h 37m

Seattle/Tacoma Intl

Sat 12/13

8:05 am-8:00 pm

1 stop8h 55m

$238

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

Tue 11/11

1:52 pm-9:59 pm

Nonstop5h 07m

$239

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 11/1

4:59 pm-7:50 pm

Nonstop5h 51m

Seattle/Tacoma Intl

Sat 11/8

7:25 am-3:28 pm

Nonstop5h 03m

$241

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 11/1

2:28 pm-8:19 pm

1 stop8h 51m

Seattle/Tacoma Intl

Sat 11/8

7:25 am-3:28 pm

Nonstop5h 03m

$249

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 12/5

1:45 pm-8:37 pm

1 stop9h 52m

Seattle/Tacoma Intl

Fri 12/5

12:31 am-10:50 am

1 stop7h 19m

$253

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Sat 10/25

3:25 pm-10:56 pm

1 stop10h 31m

Seattle/Tacoma Intl

Sat 10/25

12:34 am-11:00 am

1 stop7h 26m

$271

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Thu 10/30

1:00 pm-6:52 pm

1 stop8h 52m

Seattle/Tacoma Intl

Sun 11/9

11:30 pm-10:53 am

1 stop8h 23m

$277

Flights are sorted by cheapest round-trip flights 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 $362. If you don’t want to visit Seattle in September, then you should wait until November 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 $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 $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 $422 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $520. 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 $445 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 $356 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 27% 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 October 2025, prices for Washington, D.C. Reagan-National Airport to Seattle flights are approximately 7% 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 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 $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 $364.
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 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 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 $138Free CancellationRating
5.8
3,147 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $178Free CancellationRating
7.8
2,767 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $208Free CancellationRating
7.9
7,969 reviews
Search Delta flights
United AirlinesPriceFrom $282Free CancellationRating
7.4
8,953 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $287Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $296Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $332Free CancellationRating
8.0
4,237 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 $536, 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 $208, round-trip. It should be noted that an average Delta flight deal for this route in this time was higher, at $412 round-trip. Delta operates 3 flights out of Washington, D.C. Reagan-National Airport into Seattle in an average week, so prices vary by time and availability. 7,969 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
Federal Way
Tukwila
Kirkland
Fife
Centralia
Shoreline
Lakewood
Cle Elum
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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