How does KAYAK find such low prices on flights from District of Columbia to Seattle?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from District of Columbia to Seattle.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from District of Columbia to Seattle?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from District of Columbia is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from District of Columbia to Seattle?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to District of Columbia with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from District of Columbia to Seattle?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from District of Columbia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$176 CHEAP FLIGHTS from District of Columbia to Seattle

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Cheap Flights from District of Columbia to Seattle

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from District of Columbia to Seattle

Wed, Oct 21 - Fri, Oct 23

6:00 am - 8:58 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

29h 58m1 stop Las Vegas Harry Reid Intl

9:16 pm - 6:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

30h 04m1 stop Las Vegas Harry Reid Intl

$296Frontier

Wed, Oct 21 - Fri, Oct 23

6:00 am - 8:58 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

29h 58m1 stop Las Vegas Harry Reid Intl

9:16 pm - 6:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

30h 04m1 stop Las Vegas Harry Reid Intl

$301Frontier

Tue, Oct 27 - Tue, Oct 27

8:00 am - 10:59 amDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

5h 59mnonstop

2:19 pm - 8:00 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

26h 41m1 stop Los Angeles

$337Alaska Airlines

Sat, Nov 7 - Sat, Nov 14

5:11 pm - 8:13 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

6h 02mnonstop

1:57 pm - 9:59 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

5h 02mnonstop

$345Alaska Airlines

Wed, Oct 21 - Wed, Oct 28

6:00 am - 8:58 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

29h 58m1 stop Las Vegas Harry Reid Intl

8:35 pm - 5:50 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

18h 15m1 stop San Diego

$352Multiple Airlines

Wed, Oct 21 - Wed, Oct 28

6:00 am - 8:58 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

29h 58m1 stop Las Vegas Harry Reid Intl

8:15 am - 4:30 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 15mnonstop

$357Multiple Airlines

Fri, Nov 6 - Mon, Nov 9

7:05 am - 9:56 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 51mnonstop

4:30 pm - 12:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 50mnonstop

$373Delta

Fri, Nov 6 - Tue, Nov 10

7:05 am - 9:56 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 51mnonstop

4:30 pm - 12:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 50mnonstop

$373Delta

Wed, Nov 4 - Tue, Nov 10

5:50 pm - 8:56 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

6h 06mnonstop

8:09 am - 4:08 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 59mnonstop

$377United Airlines

Fri, Oct 30 - Sun, Nov 1

5:50 pm - 8:56 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

6h 06mnonstop

8:09 am - 4:08 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 59mnonstop

$377United Airlines

Recent last minute flight deals from District of Columbia to Seattle

Mon, Sep 28 - Mon, Oct 26

7:00 am - 3:08 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

11h 08m1 stop Denver Intl

4:27 pm - 4:47 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

21h 20m1 stop Denver Intl

$469Frontier

Mon, Sep 28 - Mon, Oct 26

6:00 am - 6:28 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

15h 28m1 stop Las Vegas Harry Reid Intl

9:16 pm - 11:43 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

23h 27m2 stops Las Vegas Harry Reid Intl Atlanta Hartsfield-Jackson

$474Frontier

Mon, Sep 28 - Mon, Oct 26

6:00 am - 9:42 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

30h 42m1 stop Las Vegas Harry Reid Intl

9:08 pm - 5:50 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

17h 42m1 stop San Diego

$495Multiple Airlines

Mon, Sep 28 - Thu, Oct 29

6:00 am - 9:42 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

30h 42m1 stop Las Vegas Harry Reid Intl

9:36 pm - 5:40 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 04mnonstop

$499Multiple Airlines

Mon, Sep 28 - Thu, Oct 29

5:45 pm - 8:37 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 52mnonstop

8:09 am - 4:08 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 59mnonstop

$707United Airlines

Fri, Sep 25 - Sat, Sep 26

9:30 am - 10:56 amDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

28h 26m1 stop Los Angeles

1:46 pm - 9:59 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

5h 13mnonstop

$721Alaska Airlines

Mon, Sep 28 - Mon, Oct 26

4:35 pm - 11:00 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

9h 25m2 stops Nashville Intl Denver Intl

6:50 pm - 8:30 amSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

10h 40m2 stops Phoenix Sky Harbor Intl Nashville Intl

$722Southwest

Mon, Sep 28 - Tue, Sep 29

9:30 am - 10:56 amDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

28h 26m1 stop Los Angeles

1:46 pm - 9:59 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

5h 13mnonstop

$725Alaska Airlines

Mon, Sep 28 - Thu, Oct 29

4:35 pm - 11:00 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

9h 25m2 stops Nashville Intl Denver Intl

9:40 pm - 3:40 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

15h 00m2 stops Oakland Chicago Midway

$728Southwest

Sat, Sep 26 - Mon, Sep 28

1:05 pm - 3:51 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 46mnonstop

11:14 pm - 7:17 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 03mnonstop

$887United Airlines

Recent direct flight deals from District of Columbia to Seattle

Sat, Nov 7 - Sat, Nov 14

5:11 pm - 8:13 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

6h 02mnonstop

1:57 pm - 9:59 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

5h 02mnonstop

$345Alaska Airlines

Sat, Oct 24 - Sat, Oct 31

7:02 am - 9:44 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 42mnonstop

8:15 am - 4:30 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 15mnonstop

$345Alaska Airlines

Sat, Nov 7 - Sat, Nov 14

7:46 am - 10:36 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 50mnonstop

9:49 pm - 5:44 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 55mnonstop

$345Alaska Airlines

Fri, Nov 6 - Mon, Nov 9

7:05 am - 9:56 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 51mnonstop

4:30 pm - 12:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 50mnonstop

$373Delta

Fri, Nov 6 - Tue, Nov 10

7:05 am - 9:56 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 51mnonstop

4:30 pm - 12:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 50mnonstop

$373Delta

Wed, Nov 4 - Tue, Nov 10

5:50 pm - 8:56 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

6h 06mnonstop

8:09 am - 4:08 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 59mnonstop

$377United Airlines

Fri, Oct 30 - Sun, Nov 1

5:50 pm - 8:56 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

6h 06mnonstop

8:09 am - 4:08 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 59mnonstop

$377United Airlines

Sat, Nov 7 - Mon, Nov 9

7:46 am - 10:36 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 50mnonstop

9:49 pm - 5:44 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 55mnonstop

$487American Airlines

Sat, Nov 7 - Sun, Nov 8

5:17 pm - 8:13 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 56mnonstop

9:49 pm - 5:44 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 55mnonstop

$487American Airlines

Mon, Dec 28 - Thu, Dec 31

7:00 am - 10:05 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

6h 05mnonstop

8:30 am - 4:28 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 58mnonstop

$553Multiple Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$176

Best time to beat the crowds with an average 25% drop in price.

Most popular time to fly with an average 24% increase in price.

Flight from Reagan Washington National Airport to Seattle

Verified travelerFlew with Alaska Airlines-Jun 2026

If you have a layover in Washington DC, check out any of the Smithsonian museums which are free.

NguyenFlew with Delta-Dec 2025

DCA airport is much easier to navigate (security, getting to gate, proximity to DC city center) than IAD

ManojFlew with Alaska Airlines-Nov 2025

Don’t bring carry on roller luggage if you can avoid it. Overhead space runs out real quick.

Verified travelerFlew with Alaska Airlines-Sep 2024

Pay the money if can afford to upgrade your seats

Verified travelerFlew with Alaska Airlines-Jul 2024

Dulles, like Seattle has a tram. That can be surprising. The TSA at Seattle is notoriously LONG, however, both times in the last year that I have flown, that has not been the case. At Dulles, the TSA lines were efficient as well. The airport interior is well marked for getting around. I did note that the garbages were full in the Southwest and Alaska areas- as we were there 6 hours and had lots of time to notice nit-picky things that nobody else would care about :). It was convenient to have a "charging station" nearby the Alaska waiting area (right across from our gate). It had 3 ports, and I noticed that as soon as I unplugged mine, it was jumped right on. Suggestion- have Dulles add a few more for passengers who need to recharge phones. Great experience, thank you.

PaulFlew with Alaska Airlines-Jun 2024

It's pricier to fly into Reagan (DCA), but if your destination is core DC area, it is well worth it. I used Ubers and Metro; no need to rent a car.

Verified travelerFlew with Alaska Airlines-Jul 2024

Be prepared Seattle is a mess as far as the overwhelming crowds when you land . The bus line to get your rental car is unbelievably long almost 100 people so be prepared once you arrive .

Verified travelerFlew with Alaska Airlines-May 2024

Get to the airport early, especially on holidays

How does KAYAK find such low prices on flights from District of Columbia to Seattle?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from District of Columbia to Seattle.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from District of Columbia to Seattle?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from District of Columbia is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from District of Columbia to Seattle?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to District of Columbia with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from District of Columbia to Seattle?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from District of Columbia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Lynnwood

Centralia

Fife

Lakewood

Westport

Lacey

Mukilteo

Woodinville

Poulsbo

Edmonds

Aberdeen

DuPont

Shoreline

Monroe

Castle Rock

Edgewood

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$176 Find Cheap Flights from District of Columbia to Seattle - Compare and Save

Cheap Flights from District of Columbia to Seattle

Recent round-trip flight deals from District of Columbia to Seattle

Recent one-way flight deals from District of Columbia to Seattle

Recent last minute flight deals from District of Columbia to Seattle

Recent direct flight deals from District of Columbia to Seattle

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Flights from District of Columbia to Seattle: the best tips from KAYAK users

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