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 35m 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 54m.

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

As of June 2026, 700 flights take off from State of Washington and land in Illinois each week. The most common flight departure day for this route is Sun, with 17% of weekly flights taking off on this day.

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

100 flights are operational daily from State of Washington to Illinois as of June 2026. The most popular departure time for this route is 10:00AM, with 59% of flights per day taking off at noon.

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

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

What airlines fly to Illinois?

American Airlines, Alaska Airlines and United Airlines 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 31% 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.

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 7 as of June 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.

$126 Cheap Flights from Washington to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Washington to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:34 pm - 11:51 am

PDX

STL

12h 17m

1 stop

12:46 pm - 8:39 pm

STL

PDX

9h 53m

1 stop

$240Frontier

Fri, Sep 11 - Sun, Sep 13

5:16 pm - 7:23 pm

PDX

STL

24h 07m

1 stop

7:10 pm - 4:54 pm

STL

PDX

23h 44m

1 stop

$250Frontier

Tue, Jul 14 - Thu, Jul 16

2:27 pm - 8:28 pm

GEG

ORD

4h 01mnonstop

11:30 am - 1:37 pm

ORD

GEG

4h 07mnonstop

$297American Airlines

Wed, Aug 12 - Wed, Sep 2

7:16 am - 6:53 pm

GEG

ORD

9h 37m

1 stop

2:21 pm - 9:40 pm

ORD

GEG

9h 19m

1 stop

$301Alaska Airlines

Tue, Oct 27 - Sat, Oct 31

2:27 pm - 8:28 pm

GEG

ORD

4h 01mnonstop

5:00 am - 11:54 am

ORD

GEG

8h 54m

1 stop

$307American Airlines

Wed, Aug 12 - Wed, Sep 2

8:15 am - 6:57 pm

GEG

ORD

8h 42m

1 stop

2:20 pm - 11:07 pm

ORD

GEG

10h 47m

1 stop

$315Alaska Airlines

Wed, Aug 5 - Wed, Aug 12

1:00 pm - 11:29 pm

GEG

ORD

8h 29m

1 stop

8:28 am - 12:57 pm

ORD

GEG

6h 29m

1 stop

$317Delta

Wed, Aug 12 - Wed, Sep 2

6:16 am - 5:40 pm

GEG

ORD

9h 24m

1 stop

7:48 am - 7:14 pm

ORD

GEG

13h 26m

2 stops

$322Delta

Wed, Aug 12 - Wed, Sep 2

10:40 pm - 4:45 am

PDX

ORD

4h 05mnonstop

5:00 am - 9:47 am

ORD

PDX

6h 47m

1 stop

$325United Airlines

Wed, Jul 29 - Wed, Aug 5

10:40 pm - 4:45 am

PDX

ORD

4h 05mnonstop

7:00 am - 9:34 am

ORD

PDX

4h 34mnonstop

$326United Airlines

Wed, Jul 15 - Wed, Jul 22

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

United Airlines flights from State of Washington to Illinois

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

United Airlines

Jul 1

GEG11:09 amSpokane

3h 51m

ORD5:00 pmChicago O'Hare Intl

Jul 7

ORD6:00 amChicago O'Hare Intl

8h 37m

1 stop

GEG12:37 pmSpokane

$326

United Airlines

Jul 15

PDX11:40 pmPortland

4h 05m

ORD5:45 amChicago O'Hare Intl

Jul 22

ORD5:00 amChicago O'Hare Intl

6h 47m

1 stop

PDX9:47 amPortland

$336

United Airlines

Jul 30

PDX11:40 pmPortland

4h 05m

ORD5:45 amChicago O'Hare Intl

Aug 9

ORD7:00 amChicago O'Hare Intl

4h 34m

PDX9:34 amPortland

$337

American Airlines flights from State of Washington to Illinois

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

American Airlines

Aug 12

GEG2:27 pmSpokane

4h 01m

ORD8:28 pmChicago O'Hare Intl

Sep 2

ORD11:30 amChicago O'Hare Intl

4h 07m

GEG1:37 pmSpokane

$297

American Airlines

Aug 12

GEG2:27 pmSpokane

4h 01m

ORD8:28 pmChicago O'Hare Intl

Sep 2

ORD5:00 amChicago O'Hare Intl

8h 54m

1 stop

GEG11:54 amSpokane

$307

American Airlines

Aug 8

GEG2:27 pmSpokane

4h 01m

ORD8:28 pmChicago O'Hare Intl

Aug 25

ORD11:30 amChicago O'Hare Intl

4h 07m

GEG1:37 pmSpokane

$309

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 9/11

9:34 pm-11:51 am

1 stop12h 17m

Lambert-St Louis

Sun 9/13

12:46 pm-8:39 pm

1 stop9h 53m

$240

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 7/14

5:16 pm-7:23 pm

1 stop24h 07m

Lambert-St Louis

Thu 7/16

7:10 pm-4:54 pm

1 stop23h 44m

$250

Quickest round-trip

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Wed 8/12

2:27 pm-8:28 pm

Nonstop4h 01m

Chicago O'Hare Intl

Wed 9/2

11:30 am-1:37 pm

Nonstop4h 07m

$297

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Tue 10/27

7:16 am-6:53 pm

1 stop9h 37m

Chicago O'Hare Intl

Sat 10/31

2:21 pm-9:40 pm

1 stop9h 19m

$301

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Wed 8/12

2:27 pm-8:28 pm

Nonstop4h 01m

Chicago O'Hare Intl

Wed 9/2

5:00 am-11:54 am

1 stop8h 54m

$307

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Wed 8/5

8:15 am-6:57 pm

1 stop8h 42m

Chicago O'Hare Intl

Wed 8/12

2:20 pm-11:07 pm

1 stop10h 47m

$315

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Wed 8/12

1:00 pm-11:29 pm

1 stop8h 29m

Chicago O'Hare Intl

Wed 9/2

8:28 am-12:57 pm

1 stop6h 29m

$317

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Wed 8/12

6:16 am-5:40 pm

1 stop9h 24m

Chicago O'Hare Intl

Wed 9/2

7:48 am-7:14 pm

2 stops13h 26m

$322

PortlandChicago

PDX - ORD

PDXORD

Portland

Wed 7/29

10:40 pm-4:45 am

Nonstop4h 05m

Chicago O'Hare Intl

Wed 8/5

5:00 am-9:47 am

1 stop6h 47m

$325

PortlandChicago

PDX - ORD

PDXORD

Portland

Wed 7/15

10:40 pm-4:45 am

Nonstop4h 05m

Chicago O'Hare Intl

Wed 7/22

7:00 am-9:34 am

Nonstop4h 34m

$326

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 January. Flight prices, which tend to average around $47, 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 $93.

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 Thursday when prices can be found for as low as $414. Flights from State of Washington to Illinois on a Sunday will generally be more expensive and average around $506. 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 $354. Flights in the morning are often more expensive with an average ticket price of $454.

What is the cheapest Washington to Illinois flight route?

Fly from Spokane to Chicago O'Hare Intl for the best Washington - Illinois flight prices

How far in advance should I book a flight from Washington 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 $328 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 $285 on momondo.

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

There are 4 cabin classes available to choose from on State of 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 38% 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	$204
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 $204. The best round-trip flight deal from State of Washington to Illinois found on momondo in the last 72 hours is $379.

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 Midway (MDW), Lambert-St Louis (STL).

Search flight deals

Frequently asked questions about flying 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 7 as of June 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 20.76% of all bookings. The subsequent popular models are Boeing 737-900 at 15.89%, Airbus A321-100/200 at 14.00%, and Airbus A321neo at 12.08%.

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 $123	Free Cancellation	Rating 7.8 8,423 reviews	Search Delta flights
Hawaiian Airlines	PriceFrom $124	Free Cancellation	Rating 7.8 2,827 reviews	Search Hawaiian Airlines flights
Alaska Airlines	PriceFrom $177	Free Cancellation	Rating 7.9 12,553 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $177	Free Cancellation	Rating 7.4 9,868 reviews	Search United Airlines flights
American Airlines	PriceFrom $180	Free Cancellation	Rating 7.1 11,724 reviews	Search American Airlines flights
Frontier	PriceFrom $193	Free Cancellation	Rating 5.6 2,877 reviews	Search Frontier flights
Southwest	PriceFrom $219	Free Cancellation	Rating 7.9 4,243 reviews	Search Southwest 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

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.

Start using Trips

Find my bookings

Get notified when prices go down

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

1 adult

Tue 7/21

Tue 7/28

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Illinois

Popular cities

Other flights from Washington

Other flights to Illinois

Airlines

Complete your trip

Feeling lucky

Popular cities in Illinois

Flights to New Yorkfrom $62

Flights to Los Angelesfrom $64

Flights to Orlandofrom $63

Flights to Miamifrom $50

Flights to Chicagofrom $74

Flights to San Franciscofrom $55

Flights to Las Vegasfrom $56

Flights to Washington, D.C.from $55

Flights to Bostonfrom $54

Flights to Atlantafrom $58

Flights to Fort Lauderdalefrom $59

Flights to Dallasfrom $72

Cheap flights from Washington to Illinois from $126

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 9/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Washington to Illinois

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

United Airlines flights from State of Washington to Illinois

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

American Airlines flights from State of Washington to Illinois

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

momondo Fare Finder

Use the filters below to find and compare flights from Washington to Illinois that are best for you.

See travel insights to Illinois from

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 from Washington to Illinois?

What cabin class options are available on State of 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

Frequently asked questions about flying from Washington to 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

Popular cities in Illinois

Popular flights according to clicks in the last 7 days on momondo

State of Washington flight routes

According to popular flight searches on momondo this year

Illinois flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Illinois

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Complete your trip to Illinois

Explore popular destinations other users love

According to popular flight searches on momondo this year