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Find cheap one-way flights from Chicago to Seattle starting at US$45.

Book one-way or return flights from Chicago to Seattle from as little as US$45. Choose from the popular airlines below and book your flight today!

  • One way
  • Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to book flights from Chicago to Seattle?

We monitor flight fares to help you find the best deals effortlessly

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Cheapest airlines flights from Chicago to Seattle

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Alaska Airlines
From US$45
American Airlines
From US$60
Frontier Airlines
From US$61
United Airlines
From US$95
Southwest Airlines
From US$100
Sun Country Airlines
From US$105
Spirit Airlines
From US$109
Delta Air Lines
From US$178
Allegiant Air
From US$187
ANA airlines

Find more flights and airlines

Find cheap flights from Chicago to Seattle by different airports

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from Chicago to Seattle.

  • Cheapest
    Alaska Airlines
    ORD
    06:00
    4h 38m
    Direct
    SEA
    08:38
    O'Hare International Airport - Seattle-Tacoma International Airport
    Tue, Mar 26Alaska Airlines
    US$45
  • Frontier Airlines
    MDW
    05:30
    16h 17m
    1 transfer
    SEA
    19:47
    Midway International Airport - Seattle-Tacoma International Airport
    Wed, May 1Frontier Airlines
    US$61
  • Allegiant Air
    RFD
    21:59
    15h 13m
    1 transfer
    SEA
    11:12
    Chicago Rockford International Airport - Seattle-Tacoma International Airport
    Mon, Apr 1Allegiant Air
    US$187
  • Allegiant Air
    RFD
    21:59
    15h 13m
    1 transfer
    SEA
    11:12
    Chicago Rockford International Airport - Seattle-Tacoma International Airport
    Mon, Apr 1Allegiant Air
    US$187
    Find More Flights

Frequently Asked Questions

  • When are flight tickets from Chicago (CHI) to Seattle (SEA) the cheapest?

    Airlines adjust prices for flights from Chicago to Seattle based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
  • How much do flights from Chicago (CHI) to Seattle (SEA) cost?

    According to Trip.com's data, the lowest price is around $308.
  • How long does it take to fly from Chicago (CHI) to Seattle (SEA) and what is the distance?

    It takes around 4 hours 37 minutes to fly from Chicago (CHI) to Seattle (SEA).
  • What is the transportation method from the main airport to downtown in Seattle?

    • The distance from Seattle-Tacoma International Airport to downtown is about 17km. It takes about 30 minutes by taxi.
  • What are the most popular airlines that fly from Chicago (CHI) to Seattle (SEA)?

Chicago to Seattle Flight Information

Cheapest nonstop flight price

$45

Cheapest round-trip ticket price

$97

Off-season for travel

November

Peak season for travel

June