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Cheap flights from Washington Dulles to Seattle / Tacoma International

Compare Washington Dulles to Seattle / Tacoma International flight deals

Find the cheapest month or even day of the year to fly to Seattle / Tacoma International

Book the best Seattle / Tacoma International fare with no extra fees

Flight deals from Washington Dulles to Seattle / Tacoma International

Looking for a cheap last-minute deal or the best round-trip flight from Washington Dulles to Seattle / Tacoma International? Find the lowest prices on one-way and round-trip tickets right here.
Seattle.C$330 per passenger.Departing Sat, Feb 15, returning Sat, Feb 22.Round-trip flight with United.Outbound direct flight with United departing from Washington Dulles on Sat, Feb 15, arriving in Seattle / Tacoma International.Inbound direct flight with United departing from Seattle / Tacoma International on Sat, Feb 22, arriving in Washington Dulles.Price includes taxes and charges.From C$330, select.
Seattle.C$330 per passenger.Departing Sat, Jan 11, returning Tue, Jan 14.Round-trip flight with United.Outbound direct flight with United departing from Washington Dulles on Sat, Jan 11, arriving in Seattle / Tacoma International.Inbound direct flight with United departing from Seattle / Tacoma International on Tue, Jan 14, arriving in Washington Dulles.Price includes taxes and charges.From C$330, select.
Seattle.C$331 per passenger.Departing Wed, Nov 20, returning Sat, Nov 23.Round-trip flight with Delta.Outbound direct flight with Delta departing from Washington Dulles on Wed, Nov 20, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departing from Seattle / Tacoma International on Sat, Nov 23, arriving in Washington Dulles.Price includes taxes and charges.From C$331, select.
Seattle.C$332 per passenger.Departing Tue, Jan 28, returning Wed, Feb 19.Round-trip flight with Delta.Outbound direct flight with Delta departing from Washington Dulles on Tue, Jan 28, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departing from Seattle / Tacoma International on Wed, Feb 19, arriving in Washington Dulles.Price includes taxes and charges.From C$332, select.
Seattle.C$343 per passenger.Departing Wed, Dec 4, returning Tue, Dec 10.Round-trip flight with United.Outbound indirect flight with United, departing from Washington Dulles on Wed, Dec 4, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departing from Seattle / Tacoma International on Tue, Dec 10, arriving in Washington Dulles.Price includes taxes and charges.From C$343, select.
Seattle.C$357 per passenger.Departing Thu, Nov 28, returning Wed, Feb 12.Round-trip flight with Delta.Outbound direct flight with Delta departing from Washington Dulles on Thu, Nov 28, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departing from Seattle / Tacoma International on Wed, Feb 12, arriving in Washington Dulles.Price includes taxes and charges.From C$357, select.
Seattle.C$358 per passenger.Departing Mon, Nov 25, returning Wed, Dec 4.Round-trip flight with Delta.Outbound direct flight with Delta departing from Washington Dulles on Mon, Nov 25, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departing from Seattle / Tacoma International on Wed, Dec 4, arriving in Washington Dulles.Price includes taxes and charges.From C$358, select.
Seattle.C$360 per passenger.Departing Tue, Dec 31, returning Mon, Jan 6.Round-trip flight with United.Outbound direct flight with United departing from Washington Dulles on Tue, Dec 31, arriving in Seattle / Tacoma International.Inbound direct flight with United departing from Seattle / Tacoma International on Mon, Jan 6, arriving in Washington Dulles.Price includes taxes and charges.From C$360, select.

Find the cheapest month to fly from Washington Dulles to Seattle / Tacoma International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to Seattle / Tacoma International flights are currently cheapest in January.
Nov
from C$331
Dec
from C$343
Jan
from C$330
Feb
from C$330
Mar
from C$382
Apr
from C$431
May
from C$430
Jun
from C$451
Jul
from C$476
Aug
from C$448
Sep
from C$432
Oct
Find prices

Direct flights from Washington Dulles to Seattle / Tacoma International

Washington Dulles to Seattle / Tacoma International: Alternative routes

Compare routes from Washington Dulles to Seattle below. You may find an airport to fly into that's cheaper, faster, or easier than Seattle / Tacoma International.

Washington, D.C. to Seattle: Flight information

The things to know before you go.
Cheapest flight foundC$330
Cheapest month to flyFebruary
Average flight time5 hrs, 57 mins
Most popular airlineHawaiian Airlines
Average flights per week156

Finding cheap flights from Washington Dulles to Seattle / Tacoma International: Frequently asked questions

The best price we found for a round-trip flight from Washington Dulles to Seattle / Tacoma International is C$330. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
5 hours and 57 minutes is the average flight time from Washington Dulles to Seattle / Tacoma International.
Hawaiian Airlines, Qatar Airways and Alaska Airlines fly direct from Washington Dulles to Seattle / Tacoma International.
There are 156 flights per week flying from Washington Dulles to Seattle / Tacoma International, as of November 2024.
The cheapest month to fly from Washington Dulles to Seattle / Tacoma International is usually November 2024.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Seattle / Tacoma International Airport on Saturday, February 15, 2025.
Yes – the average flight time is 5 hours and 57 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle / Tacoma International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, United offers the cheapest flight tickets to Seattle / Tacoma International.

How to find cheap flights to Seattle / Tacoma International from Washington Dulles

Looking for cheap tickets from Washington Dulles to Seattle / Tacoma International? Here are a few tips on how to secure the best flight price and make your journey as smooth as possible.

  • Simply hit "search." From Delta Air Lines to international carriers like Emirates, we compare all major airlines along with the most popular online travel agents to find the cheapest plane tickets from Washington Dulles to Seattle / Tacoma International. And with us, there are no hidden fees – what you see is what you pay.
  • Compare flight deals to Seattle / Tacoma International from Washington Dulles from over 1,000 providers. Then choose the cheapest plane tickets or fastest journeys.
  • Flex your dates to find the best Washington Dulles–Seattle / Tacoma International ticket prices. If you're flexible when it comes to your travel dates, use Skyscanner's "Whole month" tool to find the cheapest month, and even day to fly to Seattle / Tacoma International from Washington Dulles.
  • Set up a Price Alert. You can easily track the fare of your cheap Washington Dulles–Seattle / Tacoma International flights by creating an alert. Whenever prices go down or up, you'll get an email or push notification to help make sure you get the best possible flight deal.
  • Fly without stops. Only interested in direct flights between Washington Dulles and Seattle / Tacoma International? Make sure to tick "Direct flights only" when performing a search. If there are direct flights available on the route, these will appear in the results.
  • Find the cheapest Business Class flights from Washington Dulles and Seattle / Tacoma International. We scour the Internet for the best Business, Premium Economy and First Class flight fares to Seattle / Tacoma International, too. Check the difference in price as you search – you might just stumble on a last-minute low fare. Note that not all cabin classes are available for every destination or airline.
  • Include nearby airports in your search. Widen your search for Washington Dulles to Seattle / Tacoma International flight deals by selecting the "add nearby airports" option. This will allow you to see flight prices for all the nearest airports at your departure point and your destination and could help you save the next time you travel.

    • Combine your flight to Seattle / Tacoma International from Washington Dulles with hotels and car rental

    Once you've secured your cheap flight ticket from Washington Dulles to Seattle / Tacoma International, discover the best prices and exclusive rates for hotels in Seattle / Tacoma International or nearby. You can also compare hundreds of car rental companies at once so you get the best car rental price for your trip.


Plan the rest of your trip from Washington, D.C. to Seattle

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.