Cheap Flights from Chicago (CHI) to Seattle (SEA)

View AU$151 flight on Wed, 8 Oct 2025Opens in a new window

Popular airlines from Chicago to Seattle, WA (SEA-Seattle - Tacoma Intl.)

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Cheap Flights from Chicago (CHI) to Seattle (SEA)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sat, 25 Oct - Fri, 31 Oct
ORD
Chicago
SEA
Seattle
AU$288 Return, found 1 day ago
AU$288
Return
found 1 day ago
Select Alaska Airlines flight, departing Sat, 25 Oct from Chicago to Seattle, returning Fri, 31 Oct, priced at AU$288 found 1 day ago
American Airlines
Sat, 25 Oct - Fri, 31 Oct
ORD
Chicago
SEA
Seattle
AU$289 Return, found 1 day ago
AU$289
Return
found 1 day ago
Select American Airlines flight, departing Sat, 25 Oct from Chicago to Seattle, returning Fri, 31 Oct, priced at AU$289 found 1 day ago
Delta
Sat, 25 Oct - Fri, 31 Oct
ORD
Chicago
SEA
Seattle
AU$289 Return, found 1 day ago
AU$289
Return
found 1 day ago
Select Delta flight, departing Sat, 25 Oct from Chicago to Seattle, returning Fri, 31 Oct, priced at AU$289 found 1 day ago
Alaska Airlines
Sat, 25 Oct - Fri, 31 Oct
ORD
Chicago
SEA
Seattle
AU$303 Return, found 1 day ago
AU$303
Return
found 1 day ago
Select Alaska Airlines flight, departing Sat, 25 Oct from Chicago to Seattle, returning Fri, 31 Oct, priced at AU$303 found 1 day ago
Alaska Airlines
Sat, 25 Oct - Fri, 31 Oct
ORD
Chicago
SEA
Seattle
AU$304 Return, found 1 day ago
AU$304
Return
found 1 day ago
Select Alaska Airlines flight, departing Sat, 25 Oct from Chicago to Seattle, returning Fri, 31 Oct, priced at AU$304 found 1 day ago
American Airlines
Sat, 25 Oct - Fri, 31 Oct
ORD
Chicago
SEA
Seattle
AU$318 Return, found 1 day ago
AU$318
Return
found 1 day ago
Select American Airlines flight, departing Sat, 25 Oct from Chicago to Seattle, returning Fri, 31 Oct, priced at AU$318 found 1 day ago
Alaska Airlines
Sat, 25 Oct - Fri, 31 Oct
ORD
Chicago
SEA
Seattle
AU$320 Return, found 1 day ago
AU$320
Return
found 1 day ago
Select Alaska Airlines flight, departing Sat, 25 Oct from Chicago to Seattle, returning Fri, 31 Oct, priced at AU$320 found 1 day ago
Alaska Airlines
Sat, 25 Oct - Fri, 31 Oct
ORD
Chicago
SEA
Seattle
AU$332 Return, found 1 day ago
AU$332
Return
found 1 day ago
Select Alaska Airlines flight, departing Sat, 25 Oct from Chicago to Seattle, returning Fri, 31 Oct, priced at AU$332 found 1 day ago
American Airlines
Mon, 6 Oct - Mon, 13 Oct
ORD
Chicago
SEA
Seattle
AU$333 Return, found 2 days ago
AU$333
Return
found 2 days ago
Select American Airlines flight, departing Mon, 6 Oct from Chicago to Seattle, returning Mon, 13 Oct, priced at AU$333 found 2 days ago
United
Sat, 25 Oct - Fri, 31 Oct
ORD
Chicago
SEA
Seattle
AU$358 Return, found 1 day ago
AU$358
Return
found 1 day ago
Select United flight, departing Sat, 25 Oct from Chicago to Seattle, returning Fri, 31 Oct, priced at AU$358 found 1 day ago

Find the cheapest month to fly from Chicago (CHI) to Seattle (SEA)

November is typically the cheapest month to fly

From AU$161 - AU$431 per traveller.
Flight from Chicago to Seattle route information
Origin airport
O'Hare Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Return price
AU$288
Distance
2745 km

CHI to SEA Flights

Ready to get away? Use Expedia.com.au to book cheap flights from Illinois to Seattle AU$288, and have leftover money to spare on adventures and activities while you’re in town. We have the world’s largest selection of flights, not to mention lower airfares than you’ll find anywhere else on the Internet.

Our user-friendly tools make it easier than ever to book CHI to SEA flights, even if you’re hoping to hop aboard one of the last-minute flights leaving today. So whether you seek a spontaneous trip to this city’s hottest attractions, or prefer to plan out every detail of your adventure ahead of time, Expedia.com.au is here to help you find exactly what you are interested in.

If you’re on the hunt for cheap flights to Seattle from Illinois, you need not look any further. We make it simple for you to compare different airline carriers or choose the one that appeals to you most. We work with dozens of airlines in order to offer you incredible deals on business and personal travel. Start by searching through our selection of plane tickets today, and you’ll be in the sky before you know it.

Frequently asked questions

How much is a flight from Chicago, IL (CHI-All Airports) to SEA?
If you're travelling between Chicago, IL (CHI-All Airports) and Seattle - Tacoma Intl. Airport (SEA), round-trip flights start from AU$288. This price is based on fares available within the last 7 days on Expedia for flights departing within the next year, so don't hang around. Book today and save yourself both money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Chicago, IL (CHI-All Airports) to Sea-Tac Airport?
We understand that things crop up unexpectedly, so we've made it as simple as possible for you to cancel your trip online. Just head to the Customer Service Portal and follow the instructions.
How do I find cheap flights from Chicago, IL (CHI-All Airports) to Seattle - Tacoma Intl. Airport (SEA) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Chicago, IL (CHI-All Airports) to Seattle - Tacoma Intl. Airport (SEA) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Chicago, IL (CHI-All Airports) to Seattle - Tacoma Intl. Airport (SEA)?
Expect to be up above the clouds for a while, as the flight distance between Chicago, IL (CHI-All Airports) and Sea-Tac Airport is 2 700 kilometres. Set up a playlist of your favourite tunes before leaving home to stay entertained during the trip.
Which airlines fly direct from Chicago, IL (CHI-All Airports) to Seattle - Tacoma Intl. Airport (SEA)?
Take a look at the deals on offer with these sought-after carriers and book your ticket from Chicago, IL (CHI-All Airports) to Sea-Tac Airport today:

  • Alaska Airlines - (AS) with 134 monthly flights
  • United Airlines - (UA) with 117 monthly flights
  • Delta Air Lines - (DL) with 69 monthly flights
  • American Airlines - (AA) with 60 monthly flights

Are Chicago, IL (CHI-All Airports) to Sea-Tac Airport flight tickets cheaper when they're purchased at the last minute?
Booking last minute from Chicago, IL (CHI-All Airports) to Sea-Tac Airport can be hit-or-miss. It is possible to find a bargain, but then again, you could miss out altogether! If you'd prefer to start your trip planning early, Expedia compares flight deals up to 12 months in advance. Just remember that not all airlines advertise their prices so far in advance. Our top tip? Check back often as prices are updated frequently.

Explore a world of travel with Expedia

Chicago Airports

Chicago

O'Hare Intl. to Seattle
AU$287.80

Milwaukee

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