Cheap flights from Seattle, WA to Chicago, United States (SEA - CHI)

Flying from Seattle, WA to Chicago can be expensive. Our search helps you compare cheap flights, airfare deals, and flight tickets across airlines and agencies so you can book at the best price.

We scan trusted travel agencies and airline booking systems for the route Seattle, WA - Chicago (SEA - CHI). We do not sell tickets or add fees - you choose where to buy.

Airfares vary by date, time, and airport. Use filters to find the best option by departure/arrival time, number of stops, airline or alliance, and booking channel.

If your dates are flexible, check the low-fare calendar to find the cheapest days. Booking round-trip in one order often reduces fees, and prices usually rise as departure approaches.

We also recommend you to look through the prices for return tickets from Chicago to Seattle, WA.

Airfares found by our users in the past 24 hours

The cheapest flight from Seattle, WA to Chicago is C$186 on Alaska Airlines, departing on 02/15/2026 - 04:55 and returning on 02/18/2026 - 02:29.
The price for these dates could change. Use search to get the best price.

Average round-trip airfares from Seattle, WA to Chicago by months

MonthRound-Trip
January 2026find now
February 202615.02 - 18.02from C$186
March 2026find now
April 202628.04 - 01.05from C$220
May 2026find now
June 2026find now
July 2026find now
August 2026find now
September 2026find now
October 2026find now
November 202612.11 - 19.11from C$327
December 2026find now

Prices shown are based on searches from the last few days. Ticket prices can change and depend on availability at the time of booking.

Airlines are flying from Seattle, WA to Chicago

Southwest Airlines
Find Flights to Chicago