Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Washington, D.C. Reagan-National Airport to Seattle from $163

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 9/2. 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
1 adult, Economy, 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.
Southwest Logo
4:55 pm - 12:40 am
DCA
-
SEA
10h 45m
2 stops
Southwest Logo
11:05 pm - 11:00 am
SEA
-
DCA
8h 55m
1 stop
$324Southwest
Thu, Sep 10 - Sat, Sep 19
Alaska Airlines Logo
5:20 pm - 10:39 pm
DCA
-
SEA
8h 19m
1 stop
Alaska Airlines Logo
8:41 am - 9:00 pm
SEA
-
DCA
9h 19m
1 stop
$325Alaska Airlines
Tue, Sep 1 - Fri, Sep 11
Southwest Logo
6:40 pm - 8:35 am
DCA
-
SEA
16h 55m
2 stops
Southwest Logo
11:25 am - 10:25 pm
SEA
-
DCA
8h 00m
1 stop
$326Southwest
Wed, Aug 12 - Thu, Aug 20
JetBlue Logo
3:45 pm - 10:38 pm
DCA
-
SEA
9h 53m
1 stop
JetBlue Logo
11:55 pm - 11:20 am
SEA
-
DCA
8h 25m
1 stop
$328JetBlue
Wed, Oct 14 - Thu, Oct 22
Multiple Airlines Logo
10:59 am - 5:51 pm
DCA
-
SEA
9h 52m
1 stop
Multiple Airlines Logo
11:55 pm - 11:20 am
SEA
-
DCA
8h 25m
1 stop
$329Multiple Airlines
Fri, Sep 18 - Tue, Sep 22
Alaska Airlines Logo
5:00 pm - 7:59 pm
DCA
-
SEA
5h 59mnonstop
Alaska Airlines Logo
7:26 am - 9:00 pm
SEA
-
DCA
10h 34m
1 stop
$330Alaska Airlines
Tue, Aug 4 - Wed, Aug 12
Multiple Airlines Logo
6:00 pm - 2:18 pm
DCA
-
SEA
23h 18m
1 stop
Multiple Airlines Logo
8:00 am - 4:16 pm
SEA
-
DCA
5h 16mnonstop
$331Multiple Airlines
Fri, Jul 3 - Wed, Jul 8
Southwest Logo
3:50 pm - 11:35 pm
DCA
-
SEA
10h 45m
2 stops
Southwest Logo
10:20 am - 11:20 pm
SEA
-
DCA
10h 00m
1 stop
$333Southwest
Wed, Sep 23 - Sun, Sep 27
Multiple Airlines Logo
7:00 am - 9:17 am
DCA
-
SEA
29h 17m
1 stop
Multiple Airlines Logo
8:00 am - 4:16 pm
SEA
-
DCA
5h 16mnonstop
$334Multiple Airlines
Mon, Jul 13 - Thu, Jul 16
Southwest Logo
6:55 pm - 12:25 am
DCA
-
SEA
8h 30m
1 stop
Southwest Logo
10:45 pm - 8:25 am
SEA
-
DCA
6h 40m
1 stop
$335Southwest
Tue, Jul 21 - Wed, Jul 29

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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

Our best JetBlue deals on Washington, D.C. Reagan-National Airport to Seattle flight tickets
JetBlue
Oct 14
DCA3:45 pmWashington, D.C. Reagan-National
9h 53m
1 stop
SEA10:38 pmSeattle/Tacoma Intl
Oct 22
SEA11:55 pmSeattle/Tacoma Intl
8h 25m
1 stop
DCA11:20 amWashington, D.C. Reagan-National
$328
JetBlue
Jul 21
DCA5:00 pmWashington, D.C. Reagan-National
8h 54m
1 stop
SEA10:54 pmSeattle/Tacoma Intl
Jul 27
SEA11:46 pmSeattle/Tacoma Intl
11h 48m
1 stop
DCA2:34 pmWashington, D.C. Reagan-National
$351
JetBlue
Oct 16
DCA12:20 pmWashington, D.C. Reagan-National
13h 18m
1 stop
SEA10:38 pmSeattle/Tacoma Intl
Oct 19
SEA11:55 pmSeattle/Tacoma Intl
8h 25m
1 stop
DCA11:20 amWashington, D.C. Reagan-National
$373

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
Aug 24
DCA4:35 pmWashington, D.C. Reagan-National
6h 06m
SEA7:41 pmSeattle/Tacoma Intl
Aug 27
SEA7:20 amSeattle/Tacoma Intl
5h 01m
DCA3:21 pmWashington, D.C. Reagan-National
$345
Delta
Aug 24
DCA4:35 pmWashington, D.C. Reagan-National
6h 06m
SEA7:41 pmSeattle/Tacoma Intl
Aug 27
SEA7:20 amSeattle/Tacoma Intl
5h 01m
DCA3:21 pmWashington, D.C. Reagan-National
$355
Delta
Aug 27
DCA4:35 pmWashington, D.C. Reagan-National
6h 06m
SEA7:41 pmSeattle/Tacoma Intl
Aug 30
SEA7:20 amSeattle/Tacoma Intl
5h 01m
DCA3:21 pmWashington, D.C. Reagan-National
$361

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 June 10, 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

Thu 9/10

4:55 pm-12:40 am

2 stops10h 45m

Seattle/Tacoma Intl

Sat 9/19

11:05 pm-11:00 am

1 stop8h 55m

$324

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 9/1

5:20 pm-10:39 pm

1 stop8h 19m

Seattle/Tacoma Intl

Fri 9/11

8:41 am-9:00 pm

1 stop9h 19m

$325

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 8/12

6:40 pm-8:35 am

2 stops16h 55m

Seattle/Tacoma Intl

Thu 8/20

11:25 am-10:25 pm

1 stop8h 00m

$326

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 10/14

3:45 pm-10:38 pm

1 stop9h 53m

Seattle/Tacoma Intl

Thu 10/22

11:55 pm-11:20 am

1 stop8h 25m

$328

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 9/18

10:59 am-5:51 pm

1 stop9h 52m

Seattle/Tacoma Intl

Tue 9/22

11:55 pm-11:20 am

1 stop8h 25m

$329

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 8/4

5:00 pm-7:59 pm

Nonstop5h 59m

Seattle/Tacoma Intl

Wed 8/12

7:26 am-9:00 pm

1 stop10h 34m

$330

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Fri 7/3

6:00 pm-2:18 pm

1 stop23h 18m

Seattle/Tacoma Intl

Wed 7/8

8:00 am-4:16 pm

Nonstop5h 16m

$331

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 9/23

3:50 pm-11:35 pm

2 stops10h 45m

Seattle/Tacoma Intl

Sun 9/27

10:20 am-11:20 pm

1 stop10h 00m

$333

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Mon 7/13

7:00 am-9:17 am

1 stop29h 17m

Seattle/Tacoma Intl

Thu 7/16

8:00 am-4:16 pm

Nonstop5h 16m

$334
Quickest round-trip

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Tue 7/21

6:55 pm-12:25 am

1 stop8h 30m

Seattle/Tacoma Intl

Wed 7/29

10:45 pm-8:25 am

1 stop6h 40m

$335

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 Wednesday. momondo users have found tickets for Wednesday departures for as low as $454. 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 $578.

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 $471 when looking at flights departing at noon. Flights to Seattle are more costly in the evening, with an average ticket price of $562. 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 from Washington, D.C. Reagan-National Airport 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 $438 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 $359 on momondo.

What cabin class options are available on Washington, D.C. Reagan-National Airport to Seattle flights?

There are 4 cabin classes available to choose from on Washington, D.C. Reagan-National Airport to Seattle 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 June 2026, prices for Washington, D.C. Reagan-National Airport to Seattle flights are approximately 4% 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

$287

Fastest flight time

5h 40m

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 $287. The best round-trip flight deal from Washington, D.C. Reagan-National Airport to Seattle found on momondo in the last 72 hours is $459.
The fastest flight from Washington, D.C. Reagan-National Airport to Seattle takes 5h 40m
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 40m 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 $171Free CancellationRating
5.6
2,898 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $178Free CancellationRating
7.8
2,830 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $178Free CancellationRating
7.9
8,400 reviews
Search Delta flights
American AirlinesPriceFrom $216Free CancellationRating
7.1
11,641 reviews
Search American Airlines flights
SouthwestPriceFrom $218Free CancellationRating
7.9
4,234 reviews
Search Southwest flights
United AirlinesPriceFrom $238Free CancellationRating
7.4
9,808 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $263Free CancellationRating
7.9
12,480 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 $375, with the best Delta deals starting from $178 round-trip. 8,400 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 $532 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. 12,480 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
Lakewood
Puyallup
Tukwila
Marysville
Cle Elum
Federal Way
Fife
Centralia
Shoreline
Westport
Kirkland

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.

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Fri 7/10
Fri 7/17
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States