How many flights depart from State of Washington to Illinois on average per day?

52 flights are operational daily from State of Washington to Illinois as of March 2026. The most popular departure time for this route is 7:00AM, with 54% of flights per day taking off at noon.

What airlines fly to Illinois?

American Airlines, Alaska Airlines and Delta are the top three most popular airlines that fly to Illinois from State of Washington according to our data. American Airlines is the first choice among our users, with 30% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 7 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

How long is the flight from State of Washington to Illinois?

The flight from State of Washington to Illinois depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from Spokane (a popular airport in State of Washington) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 3h 39m on average. If you fly from Seattle (another popular airport in State of Washington) to Chicago O'Hare Intl Airport, then the average flight time is 3h 57m.

How many flights depart from State of Washington to Illinois on average per week?

As of March 2026, 368 flights take off from State of Washington and land in Illinois each week. The most common flight departure day for this route is Tue, with 20% of weekly flights taking off on this day.

What is the cheapest airline that flies from Washington to Illinois?

Southwest, Delta, and United Airlines are the most popular carriers operating from Washington to Illinois

When did momondo last update prices for flights from Washington to Illinois?

Prices for flights from Washington to Illinois are refreshed on a daily basis.

How many operators does momondo search for flights from Washington to Illinois?

The number of operators available for flights from Washington to Illinois is 8 as of March 2026.

How old do you have to be to fly from Washington to Illinois?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington to Illinois.

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

The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$80 Cheap Flights from Washington to Illinois in 2026

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Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:57 am - 11:27 pm

SEA

ORD

10h 30m

1 stop

9:42 pm - 9:49 am

ORD

SEA

14h 07m

1 stop

$208Multiple Airlines

Mi, Apr 22 - Di, Mai 5

7:12 pm - 9:45 am

SEA

ORD

12h 33m

1 stop

9:42 pm - 9:49 am

ORD

SEA

14h 07m

1 stop

$210Frontier

Sa, Mai 2 - Di, Mai 5

11:40 pm - 8:54 am

PDX

STL

7h 14m

1 stop

5:21 pm - 11:57 pm

STL

PDX

8h 36m

1 stop

$224American Airlines

Di, Apr 21 - Sa, Apr 25

11:59 pm - 6:03 am

PDX

ORD

4h 04mnonstop

8:00 pm - 10:34 pm

ORD

PDX

4h 34mnonstop

$235United Airlines

Do, Apr 16 - Mo, Apr 20

1:45 pm - 8:11 pm

PDX

ORD

4h 26mnonstop

7:29 am - 9:59 am

ORD

PDX

4h 30mnonstop

$236American Airlines

Do, Jun 4 - Mi, Jun 10

9:30 am - 9:09 pm

SEA

STL

9h 39m

1 stop

7:59 pm - 12:12 am

STL

SEA

6h 13m

1 stop

$268Delta

Mi, Mai 20 - Di, Mai 26

1:07 pm - 11:58 pm

GEG

ORD

8h 51m

1 stop

5:15 am - 11:41 am

ORD

GEG

8h 26m

1 stop

$271Delta

Di, Apr 14 - Mi, Apr 22

6:02 pm - 11:59 pm

SEA

STL

3h 57mnonstop

7:00 am - 9:35 am

STL

SEA

4h 35mnonstop

$277Alaska Airlines

Di, Apr 14 - Mi, Apr 15

7:19 am - 6:40 pm

GEG

ORD

9h 21m

1 stop

8:50 am - 10:20 pm

ORD

GEG

15h 30m

1 stop

$277Alaska Airlines

Di, Apr 14 - Mi, Apr 22

6:51 pm - 8:57 am

SEA

BMI

12h 06m

2 stops

6:00 am - 11:17 am

BMI

SEA

7h 17m

1 stop

$391United Airlines

Di, Aug 18 - Di, Sep 1

Alaska Airlines flights from State of Washington to Illinois

Our best Alaska Airlines deals on State of Washington to Illinois flight tickets

Alaska Airlines

Apr 18

SEA5:49 pmSeattle/Tacoma Intl

4h 10m

ORD11:59 pmChicago O'Hare Intl

Apr 24

ORD8:48 pmChicago O'Hare Intl

4h 41m

SEA11:29 pmSeattle/Tacoma Intl

$220

Alaska Airlines

Apr 13

SEA12:35 amSeattle/Tacoma Intl

4h 04m

ORD6:39 amChicago O'Hare Intl

Apr 22

ORD8:48 pmChicago O'Hare Intl

4h 41m

SEA11:29 pmSeattle/Tacoma Intl

$231

Alaska Airlines

Apr 13

SEA1:19 pmSeattle/Tacoma Intl

4h 30m

ORD7:49 pmChicago O'Hare Intl

Apr 21

ORD6:00 amChicago O'Hare Intl

4h 37m

SEA8:37 amSeattle/Tacoma Intl

$254

Frontier flights from State of Washington to Illinois

Our best Frontier deals on State of Washington to Illinois flight tickets

Frontier

May 2

SEA7:12 pmSeattle/Tacoma Intl

12h 33m

1 stop

ORD9:45 amChicago O'Hare Intl

May 5

ORD9:42 pmChicago O'Hare Intl

14h 07m

1 stop

SEA9:49 amSeattle/Tacoma Intl

$210

Frontier

May 9

SEA11:06 amSeattle/Tacoma Intl

17h 33m

1 stop

ORD6:39 amChicago O'Hare Intl

May 23

ORD9:42 pmChicago O'Hare Intl

14h 24m

1 stop

SEA10:06 amSeattle/Tacoma Intl

$212

Frontier

Apr 15

SEA8:07 pmSeattle/Tacoma Intl

11h 43m

1 stop

ORD9:50 amChicago O'Hare Intl

Apr 20

ORD7:56 pmChicago O'Hare Intl

23h 46m

1 stop

SEA5:42 pmSeattle/Tacoma Intl

$216

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Mi 4/22

10:57 am-11:27 pm

1 stop10h 30m

Chicago O'Hare Intl

Di 5/5

9:42 pm-9:49 am

1 stop14h 07m

$208

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sa 5/2

7:12 pm-9:45 am

1 stop12h 33m

Chicago O'Hare Intl

Di 5/5

9:42 pm-9:49 am

1 stop14h 07m

$210

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Di 4/21

11:40 pm-8:54 am

1 stop7h 14m

Lambert-St Louis

Sa 4/25

5:21 pm-11:57 pm

1 stop8h 36m

$224

PortlandChicago

PDX - ORD

PDXORD

Portland

Do 4/16

11:59 pm-6:03 am

Nonstop4h 04m

Chicago O'Hare Intl

Mo 4/20

8:00 pm-10:34 pm

Nonstop4h 34m

$235

PortlandChicago

PDX - ORD

PDXORD

Portland

Do 6/4

1:45 pm-8:11 pm

Nonstop4h 26m

Chicago O'Hare Intl

Mi 6/10

7:29 am-9:59 am

Nonstop4h 30m

$236

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mi 5/20

9:30 am-9:09 pm

1 stop9h 39m

Lambert-St Louis

Di 5/26

7:59 pm-12:12 am

1 stop6h 13m

$268

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Di 4/14

1:07 pm-11:58 pm

1 stop8h 51m

Chicago O'Hare Intl

Mi 4/22

5:15 am-11:41 am

1 stop8h 26m

$271

Quickest round-trip

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Di 4/14

6:02 pm-11:59 pm

Nonstop3h 57m

Lambert-St Louis

Mi 4/15

7:00 am-9:35 am

Nonstop4h 35m

$277

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Di 4/14

7:19 am-6:40 pm

1 stop9h 21m

Chicago O'Hare Intl

Mi 4/22

8:50 am-10:20 pm

1 stop15h 30m

$277

SeattleBloomington

SEA - BMI

SEABMI

Seattle/Tacoma Intl

Di 8/18

6:51 pm-8:57 am

2 stops12h 06m

Bloomington-Normal

Di 9/1

6:00 am-11:17 am

1 stop7h 17m

$391

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from State of Washington 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

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from State of Washington is in February. Flight prices, which tend to average around $217, 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 February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $267.

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

The cheapest day to depart from State of Washington to Illinois is on a Wednesday when prices can be found for as low as $388. Flights from State of Washington to Illinois on a Sunday will generally be more expensive and average around $483. 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 State of Washington to Illinois during this time can be as low as $292. Flights in the morning are often more expensive with an average ticket price of $438.

What is the cheapest Washington to Illinois flight route?

Fly from Seattle/Tacoma Intl to Chicago Midway for the best Washington - 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 State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $301 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from State of Washington for as low as $258 on momondo.

What cabin class options are available on Washington to Illinois flights?

There are 4 cabin classes available to choose from on Washington 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 State of Washington to Illinois flights?

You could potentially save up to 10% on your flight if you consider stops on a State of Washington to Illinois flight.

Cheap State of Washington to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Illinois

Best Price Found	$194
Fastest flight time	3h 30m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from State of Washington in the past 72 hours is $194. The best round-trip flight deal from State of Washington to Illinois found on momondo in the last 72 hours is $320.

The fastest flight from State of Washington to Illinois takes 3h 30m

Direct flights go from State of Washington to Illinois every day.

There are 98 airports in Illinois. From State of Washington 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 Washington to Illinois?
Prices for flights from Washington to Illinois are refreshed on a daily basis.
How many operators does momondo search for flights from Washington to Illinois?
The number of operators available for flights from Washington to Illinois is 8 as of March 2026.
How old do you have to be to fly from Washington to Illinois?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Washington to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from State of Washington to Illinois?
momondo data reveals that the most frequently booked plane model on the route from State of Washington to Illinois is Boeing 737-800, representing 20.88% of all bookings. The subsequent popular models are Airbus A321neo at 16.30%, Boeing 737-800 Passenger/BBJ2 (winglets) at 12.45%, and Boeing 737 MAX 9 at 11.53%.

Best airlines flying from State of Washington to Illinois

Compare and see reviews for airlines that fly from State of Washington to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $108	Free Cancellation	Rating 7.9 8,325 reviews	Search Delta flights
Hawaiian Airlines	PriceFrom $114	Free Cancellation	Rating 7.8 2,840 reviews	Search Hawaiian Airlines flights
Frontier	PriceFrom $162	Free Cancellation	Rating 5.7 3,017 reviews	Search Frontier flights
United Airlines	PriceFrom $163	Free Cancellation	Rating 7.4 9,474 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $169	Free Cancellation	Rating 7.9 12,105 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $177	Free Cancellation	Rating 8.0 4,331 reviews	Search Southwest flights
American Airlines	PriceFrom $177	Free Cancellation	Rating 7.1 11,491 reviews	Search American Airlines flights

Why use momondo?

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

It is quick and easy to find Washington to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

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

momondo does allow users to show only those flights to Illinois from Washington which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Washington.

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

If you are simply researching potential flights to Illinois, momondo offers a useful price alert feature which will track prices for flights to Illinois from Washington and alert you when they change.

An easier way to manage your Illinois trip

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Flights to Las Vegasfrom $41

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Flights to Seattlefrom $104

Cheap flights from Washington to Illinois from $80

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Illinois departing on 4/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Alaska Airlines flights from State of Washington to Illinois

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How to get the cheapest flight ticket from State of Washington to Illinois

What is the cheapest month to fly to Illinois?

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

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

What is the cheapest Washington to Illinois flight route?

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

What cabin class options are available on Washington to Illinois flights?

Can stopping save me money on State of Washington to Illinois flights?

What is the cheapest airline that flies from Washington to Illinois?

What airlines fly to Illinois?

How many flights depart from State of Washington to Illinois on average per day?

How many flights depart from State of Washington to Illinois on average per week?

How long is the flight from State of Washington to Illinois?

Cheap State of Washington to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Illinois

Best Price Found

Fastest flight time

Direct flights

Airports in Illinois

Best airlines flying from State of Washington to Illinois

Compare and see reviews for airlines that fly from State of Washington to Illinois with momondo

Why use momondo?

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Illinois

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