Washington to Seattle flights
The cheapest round trip we found from Washington to Seattle is $346 (Jan 22 – 25, 2027, 1 stop), 4% below the usual $362.
WAS to SEA · Round trip · Economy · Prices per person in USD · Price found (2 days ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $492 |
| December 2026 | $254 (cheapest month) |
| January 2027 | $346 |
| February 2027 | $378 |
| March 2027 | No fares found yet |
| April 2027 | No fares found yet |
| May 2027 | $512 |
Cheapest dates in the next 4 months
Round trip, per person-
Jan 22 – 25, 2027 3 nights · leave Fri$346$346 Book
Frontier Airlines 1 stop · 7h 27m -
Feb 6 – 15, 2027 9 nights · leave Sat$378$378 Book
Frontier Airlines 1 stop · 7h 30m
-
Dec 13 – 26 13 nights · leave Sun$386 +7% vs usual$386 +7% vs usual Book
Frontier Airlines 1 stop · 7h 31m
-
Dec 25 – 28 3 nights · leave Fri$407 +12% vs usual$407 +12% vs usual Book
Alaska Airlines 1 stop · 5h 55m -
Jan 8 – 10, 2027 2 nights · leave Fri$409 +13% vs usual$409 +13% vs usual Book
Frontier Airlines 1 stop · 7h 23m
-
Nov 18 – 21 3 nights · leave Wed$492 +36% vs usual$492 +36% vs usual Book
Frontier Airlines 1 stop · 7h 24m
-
Dec 29 – 31 2 nights · leave Tue$496 +37% vs usual$496 +37% vs usual Book
Alaska Airlines Nonstop · 6h 12m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Things to do in Seattle
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Airport transfer to Seattle
Fixed prices from SEA on KiwitaxiTo see transfer prices here, turn on partner content in .
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Plan the rest of your trip
Seattle · Jan 22 – 25, 2027Partner links: we may earn a commission if you book, at no extra cost to you.
Good to know
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Washington to Seattle: questions
How much does a flight from Washington to Seattle cost?
The cheapest round trip we have found right now is $346, leaving January 22 and returning January 25. The usual price on this route is about $362, so this fare is 4% less. Prices are per person, economy, in USD.
What is the cheapest month to fly from Washington to Seattle?
December 2026, with round trips from $254. The most expensive month in our data is May (from $512). Based on the 5 months ahead we have prices for.
Which airports do Washington to Seattle flights use?
Washington airports include Washington Dulles International (IAD) and Ronald Reagan National (DCA). Seattle airports include Seattle-Tacoma International (SEA) and Boeing Field International (BFI). The prices on this page cover every airport in both cities (WAS and SEA are the city codes).
About this route
We track round-trip economy fares from Washington (United States) to Seattle (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $346, departing January 22 and returning January 25, about 4% below the usual $362. Right now we're following 7 upcoming date combinations on this route. The cheapest month to fly in our data is December, from $254. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.