SEA

$79 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 9/27. 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

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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

Wed, Oct 22 - Sun, Oct 26
Frontier Logo
7:15 am - 12:07 pmORD-SEA
6h 52m1 stop
Frontier Logo
2:31 pm - 11:53 pmSEA-ORD
7h 22m1 stop
$170Frontier
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Thu, Oct 23 - Tue, Oct 28
Frontier Logo
6:50 am - 12:07 pmORD-SEA
7h 17m1 stop
Frontier Logo
12:58 pm - 12:12 amSEA-ORD
9h 14m1 stop
$172Frontier
Find Deal
Sun, Aug 31 - Sat, Sep 6
Hawaiian Airlines Logo
6:20 am - 8:50 amORD-SEA
4h 30mnonstop
Hawaiian Airlines Logo
5:55 pm - 12:03 amSEA-ORD
4h 08mnonstop
$174Hawaiian Airlines
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Sun, Aug 31 - Sat, Sep 6
Hawaiian Airlines Logo
6:20 am - 8:50 amORD-SEA
4h 30mnonstop
Hawaiian Airlines Logo
5:55 pm - 12:03 amSEA-ORD
4h 08mnonstop
$175Hawaiian Airlines
Find Deal
Fri, Sep 5 - Sat, Sep 6
United Airlines Logo
7:10 am - 9:43 amORD-SEA
4h 33mnonstop
United Airlines Logo
11:54 pm - 5:55 amSEA-ORD
4h 01mnonstop
$179United Airlines
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Sat, Oct 18 - Mon, Oct 20
Logo
7:05 am - 12:07 pmORD-SEA
7h 02m1 stop
Logo
12:17 am - 6:24 amSEA-ORD
4h 07mnonstop
$181
Find Deal
Fri, Sep 5 - Fri, Sep 5
Alaska Airlines Logo
7:00 am - 2:26 pmORD-SEA
9h 26m1 stop
Alaska Airlines Logo
5:55 pm - 12:03 amSEA-ORD
4h 08mnonstop
$183Alaska Airlines
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Tue, Oct 21 - Fri, Oct 24
Logo
7:15 am - 12:07 pmORD-SEA
6h 52m1 stop
Logo
12:17 am - 6:24 amSEA-ORD
4h 07mnonstop
$186
Find Deal
Sat, Oct 25 - Fri, Oct 31
Alaska Airlines Logo
3:50 pm - 11:06 pmORD-SEA
9h 16m1 stop
Alaska Airlines Logo
3:31 pm - 9:40 pmSEA-ORD
4h 09mnonstop
$194Alaska Airlines
Find Deal
Tue, Sep 23 - Tue, Sep 30
United Airlines Logo
7:10 am - 9:43 amORD-SEA
4h 33mnonstop
United Airlines Logo
1:00 pm - 11:12 pmSEA-ORD
8h 12m1 stop
$195United Airlines
Find Deal
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$79
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 9% 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
Lakewood
Lacey
Mukilteo
Edmonds
Aberdeen
Woodinville
Poulsbo
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)

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