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Cheap flights from Seattle to Illinois from $67

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Illinois departing on 1/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:58 am - 5:05 pm
SEA
-
ORD
4h 07mnonstop
United Airlines Logo
7:54 pm - 10:43 pm
ORD
-
SEA
4h 49mnonstop
$177United Airlines
Mon, Jan 26 - Sun, Feb 8
Southwest Logo
10:45 am - 4:45 pm
SEA
-
MDW
4h 00mnonstop
Southwest Logo
10:35 am - 1:15 pm
MDW
-
SEA
4h 40mnonstop
$177Southwest
Sat, Jan 17 - Fri, Jan 23
Alaska Airlines Logo
5:55 pm - 11:56 pm
SEA
-
ORD
4h 01mnonstop
Alaska Airlines Logo
1:00 pm - 3:46 pm
ORD
-
SEA
4h 46mnonstop
$178Alaska Airlines
Fri, Feb 27 - Mon, Mar 2
American Airlines Logo
8:04 am - 2:15 pm
SEA
-
ORD
4h 11mnonstop
American Airlines Logo
7:36 pm - 10:20 pm
ORD
-
SEA
4h 44mnonstop
$179American Airlines
Mon, Jan 19 - Mon, Jan 26
Hawaiian Airlines Logo
5:50 pm - 11:50 pm
SEA
-
ORD
4h 00mnonstop
Hawaiian Airlines Logo
3:44 pm - 10:15 pm
ORD
-
SEA
8h 31m1 stop
$182Hawaiian Airlines
Sat, Jan 24 - Sat, Jan 31
Hawaiian Airlines Logo
12:41 pm - 11:37 pm
SEA
-
ORD
8h 56m1 stop
Hawaiian Airlines Logo
8:00 am - 10:46 am
ORD
-
SEA
4h 46mnonstop
$184Hawaiian Airlines
Sat, Jan 24 - Sat, Jan 31
Alaska Airlines Logo
9:45 pm - 1:10 pm
SEA
-
ORD
13h 25m1 stop
Alaska Airlines Logo
8:00 am - 10:46 am
ORD
-
SEA
4h 46mnonstop
$187Alaska Airlines
Wed, Jan 28 - Sat, Jan 31
Delta Logo
11:10 pm - 9:34 am
SEA
-
STL
8h 24m1 stop
Delta Logo
6:40 pm - 12:09 am
STL
-
SEA
7h 29m1 stop
$218Delta
Tue, Feb 10 - Thu, Feb 19
Delta Logo
5:25 am - 2:48 pm
SEA
-
STL
7h 23m1 stop
Delta Logo
5:00 pm - 11:22 pm
STL
-
SEA
8h 22m1 stop
$232Delta
Tue, Jan 13 - Fri, Jan 16
American Airlines Logo
6:00 am - 3:01 pm
SEA
-
CMI
7h 01m1 stop
American Airlines Logo
7:03 am - 3:34 pm
CMI
-
SEA
10h 31m1 stop
$367American Airlines
Tue, Jan 6 - Sat, Jan 10

Hawaiian Airlines flights from Seattle to Illinois

Our best Hawaiian Airlines deals on Seattle to Illinois flight tickets
Hawaiian Airlines
Jan 24
SEA5:50 pmSeattle/Tacoma Intl
4h 00m
ORD11:50 pmChicago O'Hare Intl
Jan 31
ORD3:44 pmChicago O'Hare Intl
8h 31m
1 stop
SEA10:15 pmSeattle/Tacoma Intl
$182
Find similar
Hawaiian Airlines
Jan 24
SEA12:41 pmSeattle/Tacoma Intl
8h 56m
1 stop
ORD11:37 pmChicago O'Hare Intl
Jan 31
ORD8:00 amChicago O'Hare Intl
4h 46m
SEA10:46 amSeattle/Tacoma Intl
$184
Find similar
Hawaiian Airlines
Jan 23
SEA11:00 amSeattle/Tacoma Intl
4h 10m
ORD5:10 pmChicago O'Hare Intl
Jan 30
ORD3:44 pmChicago O'Hare Intl
8h 31m
1 stop
SEA10:15 pmSeattle/Tacoma Intl
$186
Find similar

Delta flights from Seattle to Illinois

Our best Delta deals on Seattle to Illinois flight tickets
Delta
Jan 26
SEA5:55 pmSeattle/Tacoma Intl
3h 58m
ORD11:53 pmChicago O'Hare Intl
Mar 8
ORD7:25 amChicago O'Hare Intl
4h 38m
SEA10:03 amSeattle/Tacoma Intl
$177
Find similar
Delta
Jan 22
SEA5:55 pmSeattle/Tacoma Intl
3h 58m
ORD11:53 pmChicago O'Hare Intl
Jan 28
ORD6:40 pmChicago O'Hare Intl
7h 29m
1 stop
SEA12:09 amSeattle/Tacoma Intl
$197
Find similar
Delta
Mar 24
SEA7:15 amSeattle/Tacoma Intl
4h 10m
ORD1:25 pmChicago O'Hare Intl
Mar 30
ORD3:59 pmChicago O'Hare Intl
6h 51m
1 stop
SEA8:50 pmSeattle/Tacoma Intl
$207
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 28, 2025.
Use the filters below to find and compare flights from Seattle to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Mon 1/26

10:58 am-5:05 pm

Nonstop4h 07m

Chicago O'Hare Intl

Sun 2/8

7:54 pm-10:43 pm

Nonstop4h 49m

$177

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Sat 1/17

10:45 am-4:45 pm

Nonstop4h 00m

Chicago Midway

Fri 1/23

10:35 am-1:15 pm

Nonstop4h 40m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 2/27

5:55 pm-11:56 pm

Nonstop4h 01m

Chicago O'Hare Intl

Mon 3/2

1:00 pm-3:46 pm

Nonstop4h 46m

$178

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Mon 1/19

8:04 am-2:15 pm

Nonstop4h 11m

Chicago O'Hare Intl

Mon 1/26

7:36 pm-10:20 pm

Nonstop4h 44m

$179

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 1/24

5:50 pm-11:50 pm

Nonstop4h 00m

Chicago O'Hare Intl

Sat 1/31

3:44 pm-10:15 pm

1 stop8h 31m

$182

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 1/24

12:41 pm-11:37 pm

1 stop8h 56m

Chicago O'Hare Intl

Sat 1/31

8:00 am-10:46 am

Nonstop4h 46m

$184

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 1/28

9:45 pm-1:10 pm

1 stop13h 25m

Chicago O'Hare Intl

Sat 1/31

8:00 am-10:46 am

Nonstop4h 46m

$187

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 2/10

11:10 pm-9:34 am

1 stop8h 24m

Lambert-St Louis

Thu 2/19

6:40 pm-12:09 am

1 stop7h 29m

$218

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 1/13

5:25 am-2:48 pm

1 stop7h 23m

Lambert-St Louis

Fri 1/16

5:00 pm-11:22 pm

1 stop8h 22m

$232

SeattleChampaign

SEA - CMI

SEACMI

Seattle/Tacoma Intl

Tue 1/6

6:00 am-3:01 pm

1 stop7h 01m

Champaign University-Willard

Sat 1/10

7:03 am-3:34 pm

1 stop10h 31m

$367

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from Seattle to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Seattle is in January. Flight prices, which tend to average around $229, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $257.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Seattle to Illinois is on a Wednesday when prices can be found for as low as $389. Flights from Seattle to Illinois on a Sunday will generally be more expensive and average around $489. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Seattle to Illinois during this time can be as low as $293. Flights in the morning are often more expensive with an average ticket price of $446.

What is the cheapest Seattle/Tacoma Intl to Illinois flight route?

Fly from Seattle/Tacoma Intl to Chicago Midway for the best Seattle/Tacoma Intl - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $306 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Seattle for as low as $265 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to Illinois flights?

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seattle to Illinois flights?

No. A direct flight is the cheapest option for a flight between Seattle to Illinois.

Cheap Seattle to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Illinois

Best Price Found

$182

Fastest flight time

3h 52m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from Seattle in the past 72 hours is $182. The best round-trip flight deal from Seattle to Illinois found on momondo in the last 72 hours is $302.
The fastest flight from Seattle to Illinois takes 3h 52m
Direct flights go from Seattle to Illinois every day.
There are 98 airports in Illinois. From Seattle there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Lambert-St Louis (STL).
Search flight deals

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Illinois?

    Prices for flights from Seattle/Tacoma Intl Airport to Illinois are updated daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Illinois?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Illinois?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Seattle to Illinois?

Best airlines flying from Seattle to Illinois

Compare and see reviews for airlines that fly from Seattle to Illinois with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $107Free CancellationRating
6.3
8,211 reviews
Search Spirit Airlines flights
Hawaiian AirlinesPriceFrom $121Free CancellationRating
7.8
2,819 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $122Free CancellationRating
7.9
8,021 reviews
Search Delta flights
FrontierPriceFrom $137Free CancellationRating
5.8
3,070 reviews
Search Frontier flights
United AirlinesPriceFrom $166Free CancellationRating
7.4
9,116 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $170Free CancellationRating
8.0
11,548 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $186Free CancellationRating
7.2
11,069 reviews
Search American Airlines flights
SouthwestPriceFrom $199Free CancellationRating
8.0
4,256 reviews
Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Illinois?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Illinois. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Seattle to Illinois with flexible booking policies on momondo?

All flight searches from Seattle to Illinois on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Illinois?

Once all potential Seattle to Illinois flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Seattle to Illinois right now. Can momondo alert me if prices change?

Price alerts on flights to Illinois from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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