SEA

$125 Find Cheap Flights from Illinois to Seattle - Compare and Save

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 8/20. 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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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, Sep 2 - Wed, Sep 9
American Airlines Logo
6:48 pm - 11:59 pm
PIA
-
SEA
7h 11m
1 stop
American Airlines Logo
5:30 am - 3:57 pm
SEA
-
PIA
8h 27m
1 stop
$271American Airlines
Tue, Nov 10 - Sat, Nov 14
United Airlines Logo
8:50 am - 6:31 pm
PIA
-
SEA
11h 41m
2 stops
United Airlines Logo
2:30 pm - 10:48 pm
SEA
-
PIA
6h 18m
1 stop
$276United Airlines
Sun, Aug 23 - Wed, Aug 26
Multiple Airlines Logo
1:06 pm - 10:39 am
MLI
-
SEA
23h 33m
1 stop
Multiple Airlines Logo
8:53 pm - 12:16 pm
SEA
-
MLI
13h 23m
1 stop
$316Multiple Airlines
Fri, Aug 21 - Wed, Aug 26
Multiple Airlines Logo
7:19 pm - 10:39 am
PIA
-
SEA
17h 20m
1 stop
Multiple Airlines Logo
7:06 pm - 5:24 pm
SEA
-
PIA
20h 18m
1 stop
$322Multiple Airlines
Mon, Aug 3 - Sat, Aug 8
Frontier Logo
9:57 pm - 9:17 am
ORD
-
SEA
13h 20m
1 stop
Frontier Logo
8:13 pm - 5:37 am
SEA
-
ORD
7h 24m
1 stop
$340Frontier
Fri, Aug 28 - Sun, Aug 30
Frontier Logo
8:11 pm - 10:39 am
ORD
-
SEA
16h 28m
1 stop
Frontier Logo
7:06 pm - 1:36 pm
SEA
-
ORD
16h 30m
1 stop
$341Frontier
Wed, Aug 5 - Sat, Aug 15
Southwest Logo
12:20 pm - 7:10 pm
MDW
-
SEA
8h 50m
2 stops
Southwest Logo
5:20 pm - 5:45 am
SEA
-
MDW
10h 25m
1 stop
$341Southwest
Thu, Aug 6 - Mon, Aug 10
Southwest Logo
4:55 pm - 12:40 am
MDW
-
SEA
9h 45m
1 stop
Southwest Logo
5:50 pm - 4:30 am
SEA
-
MDW
8h 40m
1 stop
$343Southwest
Fri, Aug 28 - Fri, Sep 4
Alaska Airlines Logo
2:18 pm - 11:40 pm
ORD
-
SEA
11h 22m
1 stop
Alaska Airlines Logo
5:51 pm - 11:59 pm
SEA
-
ORD
4h 08mnonstop
$344Alaska Airlines
Wed, Aug 12 - Sun, Aug 23
Alaska Airlines Logo
8:20 pm - 11:04 pm
ORD
-
SEA
4h 44mnonstop
Alaska Airlines Logo
8:48 am - 7:21 pm
SEA
-
ORD
8h 33m
1 stop
$345Alaska Airlines
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$125
Best time to beat the crowds with an average 21% drop in price.
Most popular time to fly with an average 20% 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 Airlines
ORD
-
SEA
Apr 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 Airlines
ORD
-
SEA
Apr 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
Lakewood
Mukilteo
Westport
Lacey
Woodinville
Poulsbo
Aberdeen
Edmonds
DuPont
Shoreline
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)