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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$62 CHEAP FLIGHTS from Illinois to Seattle

SEA

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41,299,237 searches in the past 7 days on KAYAK

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Cheapest round-trip

$177

Overall average: $470

Southwest

Thu 11/6Sun 11/9

MDW - SEA • Non-stop

Cheapest one-way

$62

Typical prices: $121-$258

Frontier

Tue 11/11

STL - SEA • 1 stop

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We hope you love your trip to Seattle!

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.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to Seattle

Thu, Nov 6 - Sun, Nov 9

5:25 pm - 8:00 pmMDW-SEA

4h 35mnonstop

6:35 am - 12:30 pmSEA-MDW

3h 55mnonstop

$177Southwest

Find Deal

Wed, Dec 3 - Wed, Dec 10

9:02 am - 11:47 amORD-SEA

4h 45mnonstop

1:40 pm - 7:53 pmSEA-ORD

4h 13mnonstop

$177United Airlines

Find Deal

Wed, Oct 29 - Mon, Nov 10

7:20 am - 12:13 pmORD-SEA

6h 53m1 stop

12:20 am - 6:22 amSEA-ORD

4h 02mnonstop

$178Multiple Airlines

Find Deal

Mon, Nov 3 - Sun, Nov 9

6:00 am - 1:03 pmORD-SEA

9h 03m1 stop

8:22 pm - 4:56 pmSEA-ORD

18h 34m2 stops

$179Frontier

Find Deal

Fri, Oct 31 - Sat, Nov 8

7:00 am - 2:46 pmORD-SEA

9h 46m1 stop

6:15 pm - 12:24 amSEA-ORD

4h 09mnonstop

$180Hawaiian Airlines

Find Deal

Tue, Nov 18 - Sat, Nov 22

10:00 am - 12:39 pmORD-SEA

4h 39mnonstop

12:25 am - 6:28 amSEA-ORD

4h 03mnonstop

$181Alaska Airlines

Find Deal

Wed, Oct 29 - Mon, Nov 10

7:20 am - 12:13 pmORD-SEA

6h 53m1 stop

2:22 pm - 3:39 pmSEA-ORD

23h 17m1 stop

$182Frontier

Find Deal

Thu, Mar 5 - Mon, Mar 9

8:55 am - 4:14 pmORD-SEA

9h 19m1 stop

11:59 pm - 5:56 amSEA-ORD

3h 57mnonstop

$183United Airlines

Find Deal

Fri, Nov 14 - Tue, Nov 18

2:05 pm - 6:48 pmORD-SEA

6h 43m1 stop

10:15 am - 4:30 pmSEA-ORD

4h 15mnonstop

$185Alaska Airlines

Find Deal

Tue, Nov 11 - Sat, Nov 15

6:05 pm - 12:07 pmORD-SEA

20h 02m1 stop

6:15 pm - 12:24 amSEA-ORD

4h 09mnonstop

$186Multiple Airlines

Find Deal

Useful Info

Low season	January
High season	July
Cheapest flight	$62

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

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.

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.

Lynnwood

Centralia

Fife

Westport

Mukilteo

Lakewood

Lacey

Woodinville

Aberdeen

Poulsbo

Edmonds

Shoreline

DuPont

Monroe

Castle Rock

Edgewood

Everything you need to know for your flight to Seattle

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in Seattle

Seattle (SEA)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

SEA

$62 Find Cheap Flights from Illinois to Seattle

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

Everything you should know

Cheap Flights from Illinois to Seattle

Recent round-trip flight deals from Illinois to Seattle

Recent one-way flight deals from Illinois to Seattle

Recent last minute flight deals from Illinois to Seattle

Recent direct flight deals from Illinois to Seattle

Good to know

Flights from Illinois to Seattle: the best tips from KAYAK users

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?

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Cabin class types available on flights to Illinois

Complete your trip to Seattle with a hotel stay or car rental

Find direct flights for Seattle

Flights to other popular destinations

Flights from domestic origins to Seattle

Choose which airport to fly into in Seattle

Find deals for your return flight