SEA

$75 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 10/18. 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 29 - Sun, Nov 2
Alaska Airlines Logo
9:20 am - 5:05 pmORD-SEA
9h 45m1 stop
Alaska Airlines Logo
12:20 am - 6:22 amSEA-ORD
4h 02mnonstop
$176Alaska Airlines
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Fri, Oct 3 - Mon, Oct 6
United Airlines Logo
2:53 pm - 9:34 pmORD-SEA
8h 41m1 stop
United Airlines Logo
7:00 am - 1:15 pmSEA-ORD
4h 15mnonstop
$177United Airlines
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Thu, Oct 9 - Tue, Oct 14
Frontier Logo
6:50 am - 12:07 pmORD-SEA
7h 17m1 stop
Frontier Logo
1:02 pm - 11:53 pmSEA-ORD
8h 51m1 stop
$178Frontier
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Sat, Oct 25 - Fri, Oct 31
Logo
7:05 am - 12:07 pmORD-SEA
7h 02m1 stop
Logo
6:15 pm - 12:24 amSEA-ORD
4h 09mnonstop
$179
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Mon, Oct 6 - Mon, Oct 13
Frontier Logo
10:32 am - 12:07 pmORD-SEA
27h 35m1 stop
Frontier Logo
8:43 pm - 11:53 pmSEA-ORD
25h 10m1 stop
$180Frontier
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Fri, Oct 31 - Mon, Nov 3
Logo
5:53 pm - 8:35 pmORD-SEA
4h 42mnonstop
Logo
3:01 pm - 12:15 amSEA-ORD
7h 14m1 stop
$181
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Fri, Oct 3 - Sun, Oct 5
American Airlines Logo
5:35 pm - 8:09 pmORD-SEA
4h 34mnonstop
American Airlines Logo
12:34 am - 6:42 amSEA-ORD
4h 08mnonstop
$185American Airlines
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Sat, Oct 25 - Fri, Oct 31
Hawaiian Airlines Logo
8:00 am - 10:40 amORD-SEA
4h 40mnonstop
Hawaiian Airlines Logo
6:15 pm - 12:24 amSEA-ORD
4h 09mnonstop
$187Hawaiian Airlines
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Sat, Oct 25 - Fri, Oct 31
Hawaiian Airlines Logo
6:00 am - 8:27 amORD-SEA
4h 27mnonstop
Hawaiian Airlines Logo
3:31 pm - 9:40 pmSEA-ORD
4h 09mnonstop
$189Hawaiian Airlines
Find Deal
Sat, Oct 25 - Thu, Oct 30
American Airlines Logo
11:05 am - 1:46 pmORD-SEA
4h 41mnonstop
American Airlines Logo
12:34 am - 6:42 amSEA-ORD
4h 08mnonstop
$195American Airlines
Find Deal

Everything you should know

Cheapest round-trip
$176
Overall average: $267
Alaska Airlines
Wed 10/29Sun 11/2
ORD - SEA • 1 stop
Cheapest non-stop
$182
Typical prices: $214-386
Alaska Airlines
Fri 10/17Sun 10/19
ORD - SEA • Non-stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$75
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 15% 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
Mukilteo
Lacey
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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