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.

$172 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

Tue, Oct 6 - Mon, Oct 12

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

30h 42m1 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

$281Frontier

Fri, Oct 9 - Mon, Oct 12

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

5h 52mnonstop

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

5h 03mnonstop

$281United Airlines

Thu, Oct 1 - Wed, Oct 7

3:58 pm - 9:36 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

8h 38m1 stop Chicago O'Hare Intl

11:59 pm - 10:06 amSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

7h 07m1 stop Chicago O'Hare Intl

$282American Airlines

Thu, Oct 1 - Sun, Oct 4

3:58 pm - 9:36 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

8h 38m1 stop Chicago O'Hare Intl

11:57 pm - 11:47 amSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

8h 50m1 stop Chicago O'Hare Intl

$282American Airlines

Mon, Oct 5 - Thu, Oct 15

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

5h 52mnonstop

8:25 am - 4:31 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 06mnonstop

$282United Airlines

Wed, Oct 21 - Fri, Oct 23

7:00 am - 3:12 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

11h 12m1 stop Denver Intl

4:27 pm - 12:04 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

16h 37m1 stop Denver Intl

$284Frontier

Fri, Oct 2 - Mon, Oct 5

5:57 pm - 8:44 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 47mnonstop

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

5h 04mnonstop

$288Alaska Airlines

Wed, Oct 28 - Sun, Nov 1

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

5h 42mnonstop

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

4h 55mnonstop

$288Alaska Airlines

Tue, Oct 6 - Wed, Oct 7

4:45 pm - 7:35 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

5h 50mnonstop

7:20 am - 3:23 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

5h 03mnonstop

$297Delta

Wed, Dec 9 - Thu, Dec 10

4:25 pm - 7:46 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

6h 21mnonstop

7:20 am - 3:07 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

4h 47mnonstop

$297Delta

Recent last minute flight deals from District of Columbia to Seattle

Mon, Sep 14 - Sat, Oct 3

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

11h 08m1 stop Denver Intl

8:15 pm - 12:11 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

36h 56m2 stops Los Angeles Denver Intl

$399Frontier

Tue, Sep 15 - Sat, Oct 3

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

11h 08m1 stop Denver Intl

8:15 pm - 12:11 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

36h 56m2 stops Los Angeles Denver Intl

$399Frontier

Tue, Sep 15 - Wed, Oct 28

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

11h 08m1 stop Denver Intl

8:49 am - 9:00 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

9h 11m1 stop San Diego

$427Multiple Airlines

Tue, Sep 15 - Fri, Oct 2

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

11h 08m1 stop Denver Intl

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

5h 13mnonstop

$428Multiple Airlines

Thu, Sep 10 - Fri, Sep 11

7:00 am - 9:37 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 37mnonstop

3:56 pm - 11:59 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 03mnonstop

$503Alaska Airlines

Mon, Sep 14 - Fri, Oct 2

5:00 pm - 7:51 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

5h 51mnonstop

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

5h 13mnonstop

$652Alaska Airlines

Tue, Sep 15 - Tue, Sep 29

7:00 am - 9:37 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 37mnonstop

6:40 am - 5:31 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

7h 51m1 stop Charlotte Douglas

$707American Airlines

Tue, Sep 15 - Tue, Sep 29

7:00 am - 9:37 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 37mnonstop

6:40 am - 5:31 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

7h 51m1 stop Charlotte Douglas

$737American Airlines

Fri, Sep 11 - Tue, Oct 13

12:45 pm - 3:31 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

$807United Airlines

Mon, Sep 14 - Mon, Sep 21

5:33 pm - 8:18 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 45mnonstop

11:04 pm - 7:07 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 03mnonstop

$822United Airlines

Recent direct flight deals from District of Columbia to Seattle

Fri, Oct 9 - Mon, Oct 12

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

5h 52mnonstop

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

5h 03mnonstop

$281United Airlines

Mon, Oct 5 - Thu, Oct 15

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

5h 52mnonstop

8:25 am - 4:31 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 06mnonstop

$282United Airlines

Tue, Dec 15 - Tue, Dec 22

5:45 pm - 8:20 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 35mnonstop

11:03 pm - 7:04 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 01mnonstop

$282United Airlines

Fri, Oct 2 - Mon, Oct 5

5:57 pm - 8:44 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 47mnonstop

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

5h 04mnonstop

$288Alaska Airlines

Wed, Oct 28 - Sun, Nov 1

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

5h 42mnonstop

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

4h 55mnonstop

$288Alaska Airlines

Tue, Dec 8 - Wed, Dec 9

8:00 am - 10:55 amDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

5h 55mnonstop

1:51 pm - 9:59 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

5h 08mnonstop

$292Alaska Airlines

Sun, Oct 25 - Wed, Oct 28

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

5h 51mnonstop

2:50 pm - 10:49 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 59mnonstop

$297Delta

Mon, Oct 19 - Thu, Oct 22

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

5h 51mnonstop

2:50 pm - 10:49 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

4h 59mnonstop

$297Delta

Thu, Oct 1 - Mon, Oct 5

7:00 am - 9:37 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 37mnonstop

3:56 pm - 11:59 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 03mnonstop

$407American Airlines

Thu, Oct 1 - Tue, Oct 6

7:00 am - 9:37 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 37mnonstop

3:56 pm - 11:59 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 03mnonstop

$407American Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$172

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 Washington Dulles 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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$172 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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