Chicago to Seattle flights
The cheapest round trip we found from Chicago to Seattle is $435 (Nov 25 – 27, 1 stop).
CHI to SEA · Round trip · Economy · Prices per person in USD · Price found (1 day ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $435 |
| December 2026 | $240 (cheapest month) |
Cheapest dates in the next 4 months
Round trip, per person-
Nov 25 – 27 2 nights · leave Wed$435$435 Book
Frontier Airlines 1 stop · 7h 40m -
Nov 25 – 28 3 nights · leave Wed$548$548 Book
Frontier Airlines 1 stop · 7h 40m
-
Nov 23 – 29 6 nights · leave Mon$555$555 Book
Frontier Airlines 1 stop · 7h 10m
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 · Nov 25 – 27Partner links: we may earn a commission if you book, at no extra cost to you.
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Chicago to Seattle: questions
How much does a flight from Chicago to Seattle cost?
The cheapest round trip we have found right now is $435, leaving November 25 and returning November 27. Prices are per person, economy, in USD.
Which airports do Chicago to Seattle flights use?
Chicago airports include O'Hare International (ORD), Chicago Midway International (MDW) and Chicago Rockford International (RFD). Seattle airports include Seattle-Tacoma International (SEA) and Boeing Field International (BFI). The prices on this page cover every airport in both cities (CHI and SEA are the city codes).
About this route
We track round-trip economy fares from Chicago (United States) to Seattle (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $435, departing November 25 and returning November 27. The cheapest month to fly in our data is December, from $240. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.