S$116 Cheap Flights from Chicago to Seattle

View S$116 flight on Mon, 24 Nov, 2025Opens in a new window

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

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Cheap Flights from Chicago to Seattle (CHI-SEA)

Prices were available within the past 7 days and start at S$116 for one-way flights and S$238 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sun, 31 Aug - Tue, 9 Sep
ORD
Chicago
SEA
Seattle
S$238 Return, found 5 days ago
S$238
Return
found 5 days ago
Select Delta flight, departing Sun, 31 Aug from Chicago to Seattle, returning Tue, 9 Sep, priced at S$238 found 5 days ago
Delta
Tue, 6 Jan - Tue, 20 Jan
ORD
Chicago
SEA
Seattle
S$244 Return, found 1 day ago
S$244
Return
found 1 day ago
Select Delta flight, departing Tue, 6 Jan from Chicago to Seattle, returning Tue, 20 Jan, priced at S$244 found 1 day ago
Delta
Mon, 24 Nov - Tue, 25 Nov
ORD
Chicago
SEA
Seattle
S$265 Return, found 1 day ago
S$265
Return
found 1 day ago
Select Delta flight, departing Mon, 24 Nov from Chicago to Seattle, returning Tue, 25 Nov, priced at S$265 found 1 day ago
Delta
Mon, 8 Dec - Thu, 25 Dec
ORD
Chicago
SEA
Seattle
S$277 Return, found 1 day ago
S$277
Return
found 1 day ago
Select Delta flight, departing Mon, 8 Dec from Chicago to Seattle, returning Thu, 25 Dec, priced at S$277 found 1 day ago
Delta
Sat, 13 Dec - Thu, 25 Dec
ORD
Chicago
SEA
Seattle
S$282 Return, found 1 day ago
S$282
Return
found 1 day ago
Select Delta flight, departing Sat, 13 Dec from Chicago to Seattle, returning Thu, 25 Dec, priced at S$282 found 1 day ago
Delta
Tue, 6 Jan - Thu, 22 Jan
ORD
Chicago
SEA
Seattle
S$283 Return, found 1 day ago
S$283
Return
found 1 day ago
Select Delta flight, departing Tue, 6 Jan from Chicago to Seattle, returning Thu, 22 Jan, priced at S$283 found 1 day ago
Delta
Wed, 17 Dec - Tue, 30 Dec
ORD
Chicago
SEA
Seattle
S$288 Return, found 1 day ago
S$288
Return
found 1 day ago
Select Delta flight, departing Wed, 17 Dec from Chicago to Seattle, returning Tue, 30 Dec, priced at S$288 found 1 day ago
United
Sun, 31 Aug - Tue, 9 Sep
ORD
Chicago
SEA
Seattle
S$347 Return, found 5 days ago
S$347
Return
found 5 days ago
Select United flight, departing Sun, 31 Aug from Chicago to Seattle, returning Tue, 9 Sep, priced at S$347 found 5 days ago
American Airlines
Sun, 31 Aug - Tue, 9 Sep
ORD
Chicago
SEA
Seattle
S$353 Return, found 5 days ago
S$353
Return
found 5 days ago
Select American Airlines flight, departing Sun, 31 Aug from Chicago to Seattle, returning Tue, 9 Sep, priced at S$353 found 5 days ago
Hawaiian Airlines
Tue, 30 Dec - Tue, 13 Jan
ORD
Chicago
SEA
Seattle
S$513 Return, found 1 day ago
S$513
Return
found 1 day ago
Select Hawaiian Airlines flight, departing Tue, 30 Dec from Chicago to Seattle, returning Tue, 13 Jan, priced at S$513 found 1 day ago

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

October is typically the cheapest month to fly

From S$134 - S$267 per traveller.

Graph displaying average flight prices per month

Chicago to Seattle route information
Origin airport
O'Hare Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
American Airlines, Delta, Hawaiian Airlines, United
Return price
S$231
Distance
2745 km

Flights from Illinois to Seattle

When looking for plane tickets from Illinois to Seattle, the ease and convenience of using Expedia simply can’t be beat. With tons of departure points and flights options from the top airline carriers, Expedia gives you the widest array of cheap flights to Seattle. Look for CHI to SEA airfare with the assurance that you have the largest online travel agency working for you.

Expedia lets you search across the largest number of airlines and Seattle flights, which means that you’ll be able to find a great flight deal at the perfect travel date and time. Our simple-to-use booking engine makes looking for terrific bargains easy and hassle-free; just enter your travel dates and departure city, and let Expedia do the rest! Adjust your travel dates and explore connecting flights to find an even better deal on your Illinois Seattle flight!

Browse through dozens of options and rest assured that you’re seeing the best price guaranteed! Our friendly customer service representatives are here to serve you 24 hours day to provide assistance and answer any questions that you may have about booking your Illinois to Seattle trip. There’s simply no substitute for great prices suited to your travel needs and backed by excellent customer support.

Combine your Seattle flight with a hotel and/or car rental for a package deal designed to save you even more money! Discover additional savings by booking in advance or find a last minute deal. There are tons of ways to save on your flights from Illinois to Seattle with Expedia. Use us as your stop travel destination and have the confidence that you’re getting a bargain!

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 S$238. 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
S$231.00
*Available to Expedia members.