SEA

$88 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 6/1. 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

Fri, May 1 - Tue, May 5
Frontier Logo
5:50 am - 9:27 am
ORD
-
SEA
29h 37m
2 stops
Frontier Logo
11:06 am - 6:39 am
SEA
-
ORD
17h 33m
1 stop
$226Frontier
Thu, Apr 30 - Tue, May 5
Multiple Airlines Logo
11:28 am - 3:05 pm
ORD
-
SEA
29h 37m
2 stops
Multiple Airlines Logo
11:06 am - 6:39 am
SEA
-
ORD
17h 33m
1 stop
$228Multiple Airlines
Sat, May 2 - Sat, May 2
Southwest Logo
10:00 am - 5:55 pm
MDW
-
SEA
9h 55m
1 stop
Southwest Logo
6:55 pm - 5:40 am
SEA
-
MDW
8h 45m
1 stop
$230Southwest
Sat, Jun 6 - Sat, Jun 13
Frontier Logo
9:04 pm - 6:35 pm
ORD
-
SEA
23h 31m
1 stop
Frontier Logo
8:12 pm - 5:32 am
SEA
-
ORD
7h 20m
1 stop
$230Frontier
Sat, May 2 - Sat, May 9
Southwest Logo
6:05 pm - 8:35 pm
MDW
-
SEA
4h 30mnonstop
Southwest Logo
11:55 pm - 5:55 am
SEA
-
MDW
4h 00mnonstop
$233Southwest
Wed, May 13 - Sun, May 24
Multiple Airlines Logo
9:37 pm - 9:49 am
ORD
-
SEA
14h 12m
1 stop
Multiple Airlines Logo
11:21 am - 5:59 am
SEA
-
ORD
16h 38m
1 stop
$239Multiple Airlines
Wed, Aug 19 - Tue, Aug 25
United Airlines Logo
5:45 am - 11:17 am
PIA
-
SEA
7h 32m
1 stop
United Airlines Logo
1:56 pm - 12:22 am
SEA
-
PIA
8h 26m
1 stop
$271United Airlines
Wed, Jun 10 - Sat, Jun 13
American Airlines Logo
7:03 pm - 12:16 am
PIA
-
SEA
7h 13m
1 stop
American Airlines Logo
5:10 am - 3:57 pm
SEA
-
PIA
8h 47m
1 stop
$316American Airlines
Fri, May 29 - Sat, Jun 6
American Airlines Logo
6:39 pm - 12:16 am
CMI
-
SEA
7h 37m
1 stop
American Airlines Logo
11:58 pm - 11:10 am
SEA
-
CMI
9h 12m
1 stop
$317American Airlines
Wed, Jun 3 - Mon, Jun 8
United Airlines Logo
5:33 pm - 11:59 pm
PIA
-
SEA
8h 26m
1 stop
United Airlines Logo
11:52 pm - 10:10 am
SEA
-
PIA
8h 18m
1 stop
$320United Airlines
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$88
Best time to beat the crowds with an average 17% 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 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
Aberdeen
Edmonds
Woodinville
Poulsbo
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)