Cheap Flights from Chicago (CHI) to Seattle (SEA) from HK$745~

View HK$745 flight on Sat, 6 Sep 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at HK$745 for one-way flights and HK$1,726 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, 6 Sep - Sun, 7 Sep
ORD
Chicago
SEA
Seattle
HK$1,726 Return, found 3 days ago
HK$1,726
Return
found 3 days ago
Select Delta flight, departing Sat, 6 Sep from Chicago to Seattle, returning Sun, 7 Sep, priced at HK$1,726 found 3 days ago
United
Sat, 6 Sep - Sun, 7 Sep
ORD
Chicago
SEA
Seattle
HK$2,081 Return, found 3 days ago
HK$2,081
Return
found 3 days ago
Select United flight, departing Sat, 6 Sep from Chicago to Seattle, returning Sun, 7 Sep, priced at HK$2,081 found 3 days ago
American Airlines
Sat, 13 Sep - Sun, 14 Sep
ORD
Chicago
SEA
Seattle
HK$2,317 Return, found 4 days ago
HK$2,317
Return
found 4 days ago
Select American Airlines flight, departing Sat, 13 Sep from Chicago to Seattle, returning Sun, 14 Sep, priced at HK$2,317 found 4 days ago
United
Sat, 6 Sep - Sun, 7 Sep
ORD
Chicago
SEA
Seattle
HK$2,330 Return, found 3 days ago
HK$2,330
Return
found 3 days ago
Select United flight, departing Sat, 6 Sep from Chicago to Seattle, returning Sun, 7 Sep, priced at HK$2,330 found 3 days ago
Delta
Sat, 6 Sep - Sun, 7 Sep
ORD
Chicago
SEA
Seattle
HK$2,350 Return, found 3 days ago
HK$2,350
Return
found 3 days ago
Select Delta flight, departing Sat, 6 Sep from Chicago to Seattle, returning Sun, 7 Sep, priced at HK$2,350 found 3 days ago
United
Sat, 6 Sep - Sun, 7 Sep
ORD
Chicago
SEA
Seattle
HK$2,392 Return, found 3 days ago
HK$2,392
Return
found 3 days ago
Select United flight, departing Sat, 6 Sep from Chicago to Seattle, returning Sun, 7 Sep, priced at HK$2,392 found 3 days ago
Delta
Sat, 6 Sep - Sun, 7 Sep
ORD
Chicago
SEA
Seattle
HK$2,435 Return, found 3 days ago
HK$2,435
Return
found 3 days ago
Select Delta flight, departing Sat, 6 Sep from Chicago to Seattle, returning Sun, 7 Sep, priced at HK$2,435 found 3 days ago
Delta
Sat, 13 Sep - Sun, 14 Sep
ORD
Chicago
SEA
Seattle
HK$2,436 Return, found 4 days ago
HK$2,436
Return
found 4 days ago
Select Delta flight, departing Sat, 13 Sep from Chicago to Seattle, returning Sun, 14 Sep, priced at HK$2,436 found 4 days ago
American Airlines
Sat, 13 Sep - Sun, 14 Sep
ORD
Chicago
SEA
Seattle
HK$2,554 Return, found 4 days ago
HK$2,554
Return
found 4 days ago
Select American Airlines flight, departing Sat, 13 Sep from Chicago to Seattle, returning Sun, 14 Sep, priced at HK$2,554 found 4 days ago
Delta
Sat, 6 Sep - Sun, 7 Sep
ORD
Chicago
SEA
Seattle
HK$2,618 Return, found 3 days ago
HK$2,618
Return
found 3 days ago
Select Delta flight, departing Sat, 6 Sep from Chicago to Seattle, returning Sun, 7 Sep, priced at HK$2,618 found 3 days ago

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

September is typically the cheapest month to fly

From HK$766 - HK$1,686 per traveller.

Graph displaying average flight prices per month

Chicago to Seattle route information
Origin airport
O'Hare Intl.
Destination airport
Seattle - Tacoma Intl.
Return price
HK$1,726
Distance
2745 km

Flights from Illinois to Seattle

Book cheap flights from Illinois (CHI) to Seattle (SEA) on Expedia.com.hk. Find the best flight deals to destinations around the world for your next leisure or business travel on Expedia.com.hk.

Search for flights from Illinois (CHI) to Seattle (SEA) to find great flight deals suitable to your travel date and time. Expedia.com.hk flight booking search engine is simple to use and looking for cheap flights is as easy as a click of a mouse or on your mobile devices.

Be 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 (CHI) to Seattle (SEA) trip. Call us at 3077-4857 (direct number - 24 hours day for English).

Save more when combine your Seattle flight with a hotel for a package deal! Discover additional savings by booking in advance. Now you can find activities in Seattle and things to do in Seattle for your perfect vacation with Expedia Thing to Do.

If you would like to book flights to Seattle more flexibly, many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to Seattle is HK$745 now!

 

Frequently asked questions

How much is a flight from Chicago, IL (CHI-All Airports) to SEA?
If you're traveling between Chicago, IL (CHI-All Airports) and Seattle - Tacoma Intl. Airport (SEA), round-trip flights start from HK$1,726. 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 kilometers. Set up a playlist of your favorite 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.

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