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.

$168 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, Sep 16 - Sat, Sep 26

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

30h 42m1 stop Las Vegas Harry Reid Intl

9:45 pm - 6:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

29h 35m1 stop Las Vegas Harry Reid Intl

$288Frontier

Wed, Sep 16 - Sat, Sep 26

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

30h 42m1 stop Las Vegas Harry Reid Intl

9:45 pm - 6:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

29h 35m1 stop Las Vegas Harry Reid Intl

$288Frontier

Tue, Oct 27 - Wed, Oct 28

7:24 pm - 12:28 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

20h 04m1 stop San Diego

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

5h 03mnonstop

$337Alaska Airlines

Tue, Oct 20 - Wed, Oct 21

7:24 pm - 12:28 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

20h 04m1 stop San Diego

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

5h 03mnonstop

$337Alaska Airlines

Sat, Oct 31 - Tue, Nov 3

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

11h 12m1 stop Denver Intl

9:08 am - 9:00 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

8h 52m1 stop San Diego

$343Multiple Airlines

Wed, Oct 7 - Wed, Oct 14

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

$346Multiple Airlines

Fri, Oct 9 - Wed, Oct 14

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

$377United Airlines

Sat, Oct 17 - Mon, Oct 19

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

5h 46mnonstop

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

5h 06mnonstop

$377United Airlines

Fri, Oct 16 - Mon, Oct 19

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

$377Delta

Mon, Oct 26 - Sat, Oct 31

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

5h 51mnonstop

11:58 am - 8:06 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 08mnonstop

$377Delta

Recent last minute flight deals from District of Columbia to Seattle

Fri, Aug 28 - Mon, Sep 28

8:59 am - 10:39 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

28h 40m1 stop Las Vegas Harry Reid Intl

9:45 pm - 6:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

29h 35m1 stop Las Vegas Harry Reid Intl

$384Frontier

Fri, Aug 28 - Sat, Sep 12

8:59 am - 10:39 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

28h 40m1 stop Las Vegas Harry Reid Intl

9:45 pm - 6:20 amSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

29h 35m1 stop Las Vegas Harry Reid Intl

$384Frontier

Fri, Aug 28 - Mon, Sep 28

8:59 am - 10:39 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

28h 40m1 stop Las Vegas Harry Reid Intl

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

5h 03mnonstop

$444Multiple Airlines

Fri, Aug 28 - Sat, Sep 12

1:59 pm - 9:19 amDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

22h 20m1 stop Denver Intl

8:41 am - 9:00 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

9h 19m1 stop San Diego

$474Multiple Airlines

Mon, Aug 31 - Tue, Sep 1

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

$598Alaska Airlines

Fri, Aug 28 - Mon, Sep 28

5:47 pm - 8:34 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 47mnonstop

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

5h 03mnonstop

$652Alaska Airlines

Fri, Aug 28 - Sat, Sep 12

1:20 pm - 4:06 pmIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 46mnonstop

8:10 am - 4:16 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 06mnonstop

$707United Airlines

Sat, Aug 29 - Sat, Sep 5

7:10 am - 9:55 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 45mnonstop

3:58 pm - 11:59 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 01mnonstop

$727Delta

Sat, Aug 29 - Sun, Sep 6

7:10 am - 9:55 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 45mnonstop

3:58 pm - 11:59 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 01mnonstop

$727Delta

Sat, Aug 29 - Sun, Sep 6

8:20 am - 8:43 pmDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

15h 23m2 stops Houston George Bush Intcntl San Francisco

7:00 am - 9:05 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

11h 05m1 stop Houston George Bush Intcntl

$807United Airlines

Recent direct flight deals from District of Columbia to Seattle

Wed, Oct 7 - Wed, Oct 14

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

5h 42mnonstop

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

5h 03mnonstop

$350Alaska Airlines

Sat, Oct 3 - Sat, Oct 10

8:00 am - 10:58 amDCA Washington, D.C. Reagan-National-SEA Seattle/Tacoma Intl

5h 58mnonstop

8:00 am - 4:25 pmSEA Seattle/Tacoma Intl-DCA Washington, D.C. Reagan-National

5h 25mnonstop

$351Alaska Airlines

Sat, Oct 17 - Mon, Oct 19

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

5h 42mnonstop

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

5h 03mnonstop

$351Alaska Airlines

Fri, Oct 23 - Mon, Oct 26

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

5h 46mnonstop

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

4h 59mnonstop

$377United Airlines

Tue, Nov 17 - Sun, Nov 22

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 16 - Mon, Oct 19

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

$377Delta

Fri, Sep 25 - Mon, Sep 28

7:25 am - 10:05 amIAD Washington, D.C. Dulles Intl-SEA Seattle/Tacoma Intl

5h 40mnonstop

2:52 pm - 10:56 pmSEA Seattle/Tacoma Intl-IAD Washington, D.C. Dulles Intl

5h 04mnonstop

$377Delta

Sat, Oct 10 - Thu, Oct 15

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

5h 46mnonstop

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

5h 06mnonstop

$377United Airlines

Sat, Oct 31 - Sat, Nov 7

9:38 am - 12:20 pmIAD 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

$487American Airlines

Fri, Oct 2 - Sun, Oct 4

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

$487American Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$168

Best time to beat the crowds with an average 24% 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

Everything you need to know for your flight to Seattle

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Seattle (SEA)

SEA

$168 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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Everything you need to know for your flight to Seattle

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