SEA

$59 Find Cheap Flights from Illinois to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seattle departing on 1/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$174
Overall average: $366
Multiple Airlines
Tue 12/9Thu 12/11
ORD - SEA • Non-stop
Cheapest non-stop
$175
Typical prices: $188-$372
Alaska Airlines
Fri 1/23Sun 1/25
ORD - SEA • Non-stop
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We hope you love your trip to Seattle!
Flight Deals
Useful Info
Flight Deals

Cheap Flights from Illinois to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Illinois to Seattle

Tue, Dec 9 - Thu, Dec 11
Multiple Airlines Logo
8:00 am - 10:52 amORD-SEA
4h 52mnonstop
Multiple Airlines Logo
12:48 pm - 12:12 amSEA-ORD
9h 24m1 stop
$174Multiple Airlines
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Fri, Jan 23 - Sun, Jan 25
Alaska Airlines Logo
8:00 am - 10:46 amORD-SEA
4h 46mnonstop
Alaska Airlines Logo
11:00 am - 5:10 pmSEA-ORD
4h 10mnonstop
$175Alaska Airlines
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Fri, Jan 30 - Mon, Feb 2
Southwest Logo
10:35 am - 1:15 pmMDW-SEA
4h 40mnonstop
Southwest Logo
6:45 am - 12:40 pmSEA-MDW
3h 55mnonstop
$177Southwest
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Fri, Dec 5 - Sun, Dec 7
Frontier Logo
7:00 am - 11:53 amORD-SEA
6h 53m1 stop
Frontier Logo
12:48 pm - 10:24 pmSEA-ORD
31h 36m2 stops
$180Frontier
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Fri, Dec 5 - Mon, Dec 8
Frontier Logo
12:18 pm - 11:53 amMDW-SEA
25h 35m1 stop
Frontier Logo
3:40 pm - 8:46 amSEA-MDW
15h 06m2 stops
$181Frontier
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Fri, Jan 30 - Mon, Feb 2
Southwest Logo
10:35 am - 1:15 pmMDW-SEA
4h 40mnonstop
Southwest Logo
2:05 pm - 9:50 pmSEA-MDW
5h 45m1 stop
$187Southwest
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Tue, Dec 9 - Wed, Dec 17
American Airlines Logo
6:00 am - 1:06 pmCMI-SEA
9h 06m1 stop
American Airlines Logo
5:18 am - 2:36 pmSEA-CMI
7h 18m1 stop
$268American Airlines
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Wed, Feb 11 - Tue, Feb 17
American Airlines Logo
3:58 pm - 9:47 pmMLI-SEA
7h 49m1 stop
American Airlines Logo
5:39 am - 3:04 pmSEA-MLI
7h 25m1 stop
$289American Airlines
Find Deal
Thu, Mar 26 - Thu, Apr 2
United Airlines Logo
1:24 pm - 6:58 pmPIA-SEA
7h 34m1 stop
United Airlines Logo
7:00 am - 4:45 pmSEA-PIA
7h 45m1 stop
$289United Airlines
Find Deal
Tue, Dec 9 - Wed, Dec 17
United Airlines Logo
10:50 am - 4:07 pmMLI-SEA
7h 17m1 stop
United Airlines Logo
5:00 am - 5:05 pmSEA-MLI
10h 05m2 stops
$294United Airlines
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Useful Info

Good to know

Low seasonJanuary
Cheapest flight$59
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 14% increase in price.
Flight from St. Louis to Seattle

Flights from Illinois to Seattle: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Illinois to Seattle 
Learn how KAYAK collects reviews and tips from users.
PaulFlew with Alaska AirlinesORD-SEAApr 2024
The flight is long, at over four hours. I would try to get a window or aisle seat to be more comfortable. I would check with other airlines that allow you to choose your seat even if you are in the economy section. I would bring your own food on the plane as the service was sometimes sketchy.
Verified travelerFlew with Alaska AirlinesORD-SEAApr 2024
If you miss your flight ask any alaska agent to how and where to rebook the flight.

FAQs for booking flights from Illinois to Seattle

  • How does KAYAK find such low prices on flights from Illinois to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Illinois to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Illinois with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Centralia
Fife
Westport
Mukilteo
Lakewood
Lacey
Aberdeen
Poulsbo
Edmonds
Woodinville
Shoreline
DuPont
Monroe
Castle Rock
Edgewood

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Seattle (SEA)