SEA

$171 Find Cheap Flights from District of Columbia to Seattle - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seattle departing on 8/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Cheap Flights from District of Columbia to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from District of Columbia to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

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

Thu, Aug 27 - Thu, Sep 3
Alaska Airlines Logo
7:00 am - 9:37 am
IAD
-
SEA
5h 37mnonstop
Alaska Airlines Logo
9:35 pm - 5:40 am
SEA
-
IAD
5h 05mnonstop
$308Alaska Airlines
Fri, Aug 28 - Fri, Sep 4
Alaska Airlines Logo
7:00 am - 9:37 am
IAD
-
SEA
5h 37mnonstop
Alaska Airlines Logo
9:35 pm - 5:40 am
SEA
-
IAD
5h 05mnonstop
$309Alaska Airlines
Fri, Aug 14 - Tue, Aug 18
Frontier Logo
7:00 am - 9:04 am
DCA
-
SEA
29h 04m
1 stop
Frontier Logo
8:53 pm - 12:51 pm
SEA
-
DCA
36h 58m
2 stops
$309Frontier
Fri, Aug 28 - Fri, Sep 4
Alaska Airlines Logo
7:00 am - 9:37 am
IAD
-
SEA
5h 37mnonstop
Alaska Airlines Logo
9:35 pm - 5:40 am
SEA
-
IAD
5h 05mnonstop
$310Alaska Airlines
Sat, Sep 5 - Mon, Sep 14
Alaska Airlines Logo
5:00 pm - 7:51 pm
DCA
-
SEA
5h 51mnonstop
Alaska Airlines Logo
9:25 pm - 5:59 pm
SEA
-
DCA
17h 34m
1 stop
$310Alaska Airlines
Tue, Aug 18 - Tue, Aug 25
Frontier Logo
9:13 am - 10:39 am
IAD
-
SEA
28h 26m
1 stop
Frontier Logo
2:37 pm - 8:04 am
SEA
-
IAD
14h 27m
2 stops
$311Frontier
Mon, Aug 24 - Mon, Aug 31
Multiple Airlines Logo
5:00 pm - 7:51 pm
DCA
-
SEA
5h 51mnonstop
Multiple Airlines Logo
7:06 pm - 4:59 pm
SEA
-
DCA
18h 53m
1 stop
$312Multiple Airlines
Thu, Sep 17 - Sat, Sep 26
American Airlines Logo
7:57 am - 3:17 pm
IAD
-
SEA
10h 20m
1 stop
American Airlines Logo
6:40 am - 5:31 pm
SEA
-
IAD
7h 51m
1 stop
$315American Airlines
Mon, Aug 10 - Thu, Aug 13
Southwest Logo
6:40 pm - 11:55 pm
DCA
-
SEA
8h 15m
1 stop
Southwest Logo
11:05 pm - 11:50 am
SEA
-
DCA
9h 45m
1 stop
$315Southwest
Tue, Aug 11 - Mon, Aug 17
Multiple Airlines Logo
6:03 am - 8:48 am
IAD
-
SEA
5h 45mnonstop
Multiple Airlines Logo
8:25 pm - 8:04 am
SEA
-
IAD
8h 39m
1 stop
$319Multiple Airlines
Useful Info

Good to know

Low season

January

Cheapest flight

$171
Best time to beat the crowds with an average 22% drop in price.
Most popular time to fly with an average 24% increase in price.
Flight from Washington Dulles Airport to Seattle

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

Insights shared by verified travelers who flew the route from District of Columbia to Seattle 
Verified travelerFlew with Alaska Airlines
IAD
-
SEA
Jun 2026
If you have a layover in Washington DC, check out any of the Smithsonian museums which are free.
NguyenFlew with Delta
DCA
-
SEA
Dec 2025
DCA airport is much easier to navigate (security, getting to gate, proximity to DC city center) than IAD
ManojFlew with Alaska Airlines
DCA
-
SEA
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
IAD
-
SEA
Sep 2024
Pay the money if can afford to upgrade your seats
Verified travelerFlew with Alaska Airlines
IAD
-
SEA
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
DCA
-
SEA
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
DCA
-
SEA
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
IAD
-
SEA
May 2024
Get to the airport early, especially on holidays

FAQs for booking flights from District of Columbia to Seattle

  • 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.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Centralia
Fife
Lakewood
Lacey
Mukilteo
Westport
Woodinville
Poulsbo
Aberdeen
Edmonds
DuPont
Shoreline
Monroe
Castle Rock
Edgewood

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle