SEA

$62 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 1/31. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

Travelers love KAYAK
41 299 237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$177
Overall average: $203
Delta
Mon 1/12Sun 1/18
MDW - SEA • 1 stop
Cheapest non-stop
$177
Typical prices: $187-$373
Alaska Airlines
Tue 1/13Mon 1/19
ORD - SEA • Non-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
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

Mon, Jan 12 - Sun, Jan 18
Delta Logo
1:49 pm - 8:46 pmMDW-SEA
8h 57m1 stop
Delta Logo
6:05 am - 5:34 pmSEA-MDW
9h 29m1 stop
$177Delta
Find Deal
Fri, Mar 13 - Fri, Mar 13
Delta Logo
7:20 am - 9:58 amORD-SEA
4h 38mnonstop
Delta Logo
5:57 pm - 11:53 pmSEA-ORD
3h 56mnonstop
$177Delta
Find Deal
Tue, Feb 10 - Wed, Feb 18
Southwest Logo
7:15 am - 4:00 pmORD-SEA
10h 45m2 stops
Southwest Logo
8:45 am - 10:35 pmSEA-ORD
11h 50m1 stop
$179Southwest
Find Deal
Mon, Jan 5 - Wed, Jan 7
Southwest Logo
5:25 pm - 8:00 pmMDW-SEA
4h 35mnonstop
Southwest Logo
6:45 am - 12:40 pmSEA-MDW
3h 55mnonstop
$180Southwest
Find Deal
Mon, Jan 5 - Wed, Jan 7
American Airlines Logo
7:25 am - 10:02 amORD-SEA
4h 37mnonstop
American Airlines Logo
8:04 am - 2:15 pmSEA-ORD
4h 11mnonstop
$181American Airlines
Find Deal
Thu, Jan 15 - Sun, Jan 18
United Airlines Logo
7:54 pm - 10:43 pmORD-SEA
4h 49mnonstop
United Airlines Logo
5:00 am - 2:55 pmSEA-ORD
7h 55m1 stop
$185United Airlines
Find Deal
Thu, Jan 15 - Mon, Jan 19
American Airlines Logo
3:37 pm - 11:51 pmSTL-SEA
10h 14m1 stop
American Airlines Logo
9:45 pm - 9:40 amSEA-STL
9h 55m1 stop
$207American Airlines
Find Deal
Fri, Feb 6 - Sun, Feb 8
Frontier Logo
9:43 pm - 11:39 amSTL-SEA
15h 56m1 stop
Frontier Logo
12:34 pm - 12:50 pmSEA-STL
22h 16m1 stop
$211Frontier
Find Deal
Sun, Mar 8 - Thu, Mar 12
Frontier Logo
7:43 pm - 12:30 pmSTL-SEA
18h 47m1 stop
Frontier Logo
2:54 pm - 10:02 amSEA-STL
17h 08m1 stop
$218Frontier
Find Deal
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
6:00 pm - 10:59 pmSTL-SEA
6h 59m1 stop
United Airlines Logo
9:00 am - 9:00 pmSEA-STL
10h 00m2 stops
$224United Airlines
Find Deal
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$62
Best time to beat the crowds with an average 15% 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
Lakewood
Mukilteo
Lacey
Poulsbo
Edmonds
Aberdeen
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)