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

As of March 2026, 390 flights take off from Illinois and land in State of Washington each week. The most common flight departure day for this route is Fri, with 18% of weekly flights taking off on this day.

What airlines fly to State of Washington?

Alaska Airlines, American Airlines and Delta are the top three most popular airlines that fly to State of Washington from Illinois according to our data. Alaska Airlines is the first choice among our users, with 32% of people opting to fly with this airline when traveling to State of Washington. Keep in mind that there are 7 different airlines that fly to State of Washington on a routine basis, so you have a few additional options to choose from.

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

If you’re flying from a popular airport in Illinois, such as Chicago or Peoria, and flying into State of Washington, then you can expect flight times to average 4h 30m and 6h 54m, respectively.

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

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

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

As of March 2026, there are 55 flights per day flying from Illinois to State of Washington. The most common time of day flights depart is 8:00PM, with 38% of flights taking off in the evening.

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

Prices for flights from Illinois to Washington were last updated today.

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

As of March 2026, there are 8 operators available to choose from for flights from Illinois to Washington.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Washington.

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

The travel and health documents you'll need for your trip to Washington may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$66 Cheap Flights from Illinois to Washington in 2026

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Find the cheapest flights from Illinois to Washington

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:19 pm - 1:02 pm

STL

PDX

18h 43m

1 stop

11:48 am - 7:32 pm

PDX

STL

29h 44m

1 stop

$147Frontier

Mon, Apr 13 - Fri, Apr 17

5:21 pm - 12:36 am

STL

SEA

9h 15m

1 stop

1:19 pm - 11:46 pm

SEA

STL

8h 27m

1 stop

$176American Airlines

Tue, Apr 21 - Fri, Apr 24

6:45 pm - 11:59 pm

STL

SEA

7h 14m

1 stop

1:30 pm - 9:31 pm

SEA

STL

6h 01m

1 stop

$177Delta

Tue, Apr 21 - Sat, Apr 25

6:15 am - 5:55 pm

MDW

SEA

13h 40m

1 stop

11:55 pm - 5:55 am

SEA

MDW

4h 00mnonstop

$179Southwest

Sat, May 2 - Sat, May 9

8:17 pm - 10:20 am

STL

PDX

16h 03m

1 stop

12:27 pm - 6:50 am

PDX

STL

40h 23m

2 stops

$179Frontier

Sat, Apr 18 - Sat, Apr 25

5:45 am - 1:50 pm

MDW

SEA

10h 05m

1 stop

8:25 pm - 5:45 am

SEA

MDW

7h 20m

1 stop

$181Southwest

Wed, Mar 11 - Wed, Mar 18

7:20 am - 2:54 pm

ORD

SEA

9h 34m

1 stop

5:55 pm - 11:52 pm

SEA

ORD

3h 57mnonstop

$182Delta

Wed, Mar 18 - Mon, Mar 23

9:10 am - 11:46 am

ORD

PDX

4h 36mnonstop

11:59 pm - 10:05 am

PDX

ORD

8h 06m

1 stop

$205United Airlines

Tue, Apr 28 - Tue, May 5

6:00 am - 12:30 pm

ORD

GEG

8h 30m

1 stop

12:36 pm - 11:41 pm

GEG

ORD

9h 05m

1 stop

$235Alaska Airlines

Sat, Aug 22 - Sat, Aug 29

5:33 pm - 11:53 pm

PIA

PDX

8h 20m

1 stop

11:40 pm - 10:10 am

PDX

PIA

8h 30m

1 stop

$309United Airlines

Fri, May 22 - Mon, May 25

American Airlines flights from Illinois to State of Washington

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

American Airlines

Apr 21

STL5:21 pmLambert-St Louis

9h 15m

1 stop

SEA12:36 amSeattle/Tacoma Intl

Apr 24

SEA1:19 pmSeattle/Tacoma Intl

8h 27m

1 stop

STL11:46 pmLambert-St Louis

$176

American Airlines

Apr 14

STL4:30 pmLambert-St Louis

8h 26m

1 stop

PDX10:56 pmPortland

Apr 21

PDX6:00 amPortland

9h 21m

1 stop

STL5:21 pmLambert-St Louis

$181

American Airlines

Apr 21

STL5:21 pmLambert-St Louis

7h 17m

1 stop

SEA10:38 pmSeattle/Tacoma Intl

May 2

SEA11:55 pmSeattle/Tacoma Intl

6h 59m

1 stop

STL8:54 amLambert-St Louis

$197

Delta flights from Illinois to State of Washington

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

Delta

Apr 21

STL2:20 pmLambert-St Louis

6h 10m

1 stop

SEA6:30 pmSeattle/Tacoma Intl

Apr 28

SEA9:50 amSeattle/Tacoma Intl

5h 36m

1 stop

STL5:26 pmLambert-St Louis

$177

Delta

Mar 18

ORD7:20 amChicago O'Hare Intl

9h 34m

1 stop

SEA2:54 pmSeattle/Tacoma Intl

Mar 23

SEA5:55 pmSeattle/Tacoma Intl

3h 57m

ORD11:52 pmChicago O'Hare Intl

$182

Delta

Apr 24

STL6:45 pmLambert-St Louis

7h 14m

1 stop

SEA11:59 pmSeattle/Tacoma Intl

Apr 29

SEA11:14 pmSeattle/Tacoma Intl

8h 28m

1 stop

STL9:42 amLambert-St Louis

$185

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 4/13

8:19 pm-1:02 pm

1 stop18h 43m

Portland

Fri 4/17

11:48 am-7:32 pm

1 stop29h 44m

$147

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 4/21

5:21 pm-12:36 am

1 stop9h 15m

Seattle/Tacoma Intl

Fri 4/24

1:19 pm-11:46 pm

1 stop8h 27m

$176

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 4/21

6:45 pm-11:59 pm

1 stop7h 14m

Seattle/Tacoma Intl

Sat 4/25

1:30 pm-9:31 pm

1 stop6h 01m

$177

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Sat 5/2

6:15 am-5:55 pm

1 stop13h 40m

Seattle/Tacoma Intl

Sat 5/9

11:55 pm-5:55 am

Nonstop4h 00m

$179

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Sat 4/18

8:17 pm-10:20 am

1 stop16h 03m

Portland

Sat 4/25

12:27 pm-6:50 am

2 stops40h 23m

$179

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Wed 3/11

5:45 am-1:50 pm

1 stop10h 05m

Seattle/Tacoma Intl

Wed 3/18

8:25 pm-5:45 am

1 stop7h 20m

$181

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 3/18

7:20 am-2:54 pm

1 stop9h 34m

Seattle/Tacoma Intl

Mon 3/23

5:55 pm-11:52 pm

Nonstop3h 57m

$182

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Tue 4/28

9:10 am-11:46 am

Nonstop4h 36m

Portland

Tue 5/5

11:59 pm-10:05 am

1 stop8h 06m

$205

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Sat 8/22

6:00 am-12:30 pm

1 stop8h 30m

Spokane

Sat 8/29

12:36 pm-11:41 pm

1 stop9h 05m

$235

PeoriaPortland

PIA - PDX

PIAPDX

Greater Peoria

Fri 5/22

5:33 pm-11:53 pm

1 stop8h 20m

Portland

Mon 5/25

11:40 pm-10:10 am

1 stop8h 30m

$309

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 Illinois to State of Washington

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 State of Washington?

The month of January is, on average, the cheapest month to fly to State of Washington from Illinois, with most prices found around $209. If you aren’t able to travel to State of Washington during the month of January, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $238.

What is the cheapest day to depart on your flight to State of Washington?

The cheapest day to depart from Illinois to State of Washington is on a Wednesday. Travelers who choose to depart for State of Washington on a Wednesday will often find tickets for as low as $319. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to State of Washington for around $435.

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

The cheapest time of day to fly to State of Washington is in the evening when flights can be purchased for as low as $321. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $354 on average. Flights to State of Washington from Illinois in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Illinois to Washington flight route?

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

How far in advance should I book a flight to State of Washington?

You are more likely to see cheaper flights to State of Washington from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to State of Washington for around $277 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to State of Washington from Illinois for as low as $241 on momondo.

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

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

No. A direct flight is the cheapest option for a flight between Illinois to State of Washington.

Cheap Illinois to State of Washington flight deals and tips

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

Best Price Found	$117
Fastest flight time	3h 45m
Direct flights	Every day
Airports in State of Washington	96 airports

The best one-way flight to State of Washington from Illinois in the past 72 hours is $117. The best round-trip flight deal from Illinois to State of Washington found on momondo in the last 72 hours is $217.

The fastest flight from Illinois to State of Washington takes 3h 45m

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

There are 96 airports in State of Washington. From Illinois there are direct flights to Portland (PDX), Spokane (GEG).

Search flight deals

When did momondo last update prices for flights from Illinois to Washington?
Prices for flights from Illinois to Washington were last updated today.
How many operators does momondo search for flights from Illinois to Washington?
As of March 2026, there are 8 operators available to choose from for flights from Illinois to Washington.
How old do you have to be to fly from Illinois to Washington?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to Washington.
What documentation or ID do you need to fly to Washington?
The travel and health documents you'll need for your trip to Washington may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Illinois to State of Washington?
momondo data reveals that the most frequently booked plane model on the route from Illinois to State of Washington is Boeing 737-800, representing 22.42% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 17.13%, Airbus A321neo at 15.25%, and Boeing 737 MAX 9 at 13.54%.

Best airlines flying from Illinois to State of Washington

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

Airline	Rating	Free Cancellation	Price
Hawaiian Airlines	PriceFrom $84	Free Cancellation	Rating 7.8 2,837 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $109	Free Cancellation	Rating 7.9 8,240 reviews	Search Delta flights
Frontier	PriceFrom $153	Free Cancellation	Rating 5.7 3,040 reviews	Search Frontier flights
American Airlines	PriceFrom $163	Free Cancellation	Rating 7.1 11,370 reviews	Search American Airlines flights
United Airlines	PriceFrom $166	Free Cancellation	Rating 7.4 9,371 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $169	Free Cancellation	Rating 8.0 11,973 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $194	Free Cancellation	Rating 8.0 4,303 reviews	Search Southwest flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to Washington. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Illinois to Washington flights to just show those with flexible booking policies.

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

Once you have performed a search for Illinois to Washington flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

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

An easier way to manage your State of Washington trip

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Cheap flights from Illinois to Washington from $66

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Washington departing on 4/25. 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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American Airlines flights from Illinois to State of Washington

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

Delta flights from Illinois to State of Washington

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

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

What is the cheapest month to fly to State of Washington?

What is the cheapest day to depart on your flight to State of Washington?

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

What is the cheapest Illinois to Washington flight route?

How far in advance should I book a flight to State of Washington?

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

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

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

What airlines fly to State of Washington?

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

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

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

Cheap Illinois to State of Washington flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in State of Washington

Best airlines flying from Illinois to State of Washington

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

Why use momondo?

An easier way to manage your State of Washington 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 Washington

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