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 Moline, and flying into State of Washington, then you can expect flight times to average 4h 27m and 7h 09m, respectively.

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

Delta, Southwest, and United 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 April 2026, there are 66 flights per day flying from Illinois to State of Washington. The most common time of day flights depart is 7:00PM, with 48% of flights taking off in the evening.

What airlines fly to State of Washington?

Alaska Airlines, American Airlines and United Airlines 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 31% 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 many flights depart from Illinois to State of Washington on average per week?

As of April 2026, 465 flights take off from Illinois and land in State of Washington each week. The most common flight departure day for this route is Mon, with 18% of weekly flights taking off on this day.

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 April 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.

$85 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.

9:55 pm - 8:59 am

STL

PDX

13h 04m

1 stop

11:15 am - 7:21 pm

PDX

STL

6h 06m

1 stop

$226Frontier

Thu, Apr 30 - Sun, May 3

8:08 pm - 10:06 am

STL

SEA

15h 58m

1 stop

7:50 pm - 7:23 pm

SEA

STL

21h 33m

1 stop

$230Frontier

Tue, May 26 - Thu, May 28

5:20 am - 10:48 am

STL

SEA

7h 28m

1 stop

2:10 pm - 10:59 pm

SEA

STL

6h 49m

1 stop

$236American Airlines

Thu, May 7 - Mon, May 11

7:52 pm - 11:59 pm

STL

SEA

6h 07m

1 stop

6:05 am - 4:52 pm

SEA

STL

8h 47m

1 stop

$238Delta

Tue, Jun 9 - Wed, Jun 17

12:47 pm - 3:20 pm

ORD

SEA

4h 33mnonstop

10:59 am - 5:13 pm

SEA

ORD

4h 14mnonstop

$240Delta

Tue, May 12 - Sat, May 16

7:00 am - 12:50 pm

ORD

SEA

7h 50m

1 stop

5:48 pm - 11:59 pm

SEA

ORD

4h 11mnonstop

$241Alaska Airlines

Wed, Sep 2 - Wed, Sep 9

8:00 pm - 10:35 pm

ORD

PDX

4h 35mnonstop

7:45 pm - 5:40 am

PDX

ORD

7h 55m

1 stop

$245United Airlines

Tue, May 12 - Sat, May 16

8:00 pm - 10:35 pm

ORD

PDX

4h 35mnonstop

10:55 pm - 5:02 am

PDX

ORD

4h 07mnonstop

$251United Airlines

Sat, May 9 - Wed, May 13

6:11 pm - 11:54 pm

STL

PDX

7h 43m

1 stop

1:52 pm - 10:59 pm

PDX

STL

7h 07m

1 stop

$271American Airlines

Fri, May 15 - Tue, May 19

5:33 pm - 7:50 pm

STL

PDX

4h 17mnonstop

10:37 am - 4:37 pm

PDX

STL

4h 00mnonstop

$277Alaska Airlines

Wed, May 27 - Sat, May 30

Frontier flights from Illinois to State of Washington

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

Frontier

Apr 30

STL9:55 pmLambert-St Louis

13h 04m

1 stop

PDX8:59 amPortland

May 3

PDX11:15 amPortland

6h 06m

1 stop

STL7:21 pmLambert-St Louis

$226

Frontier

May 26

STL8:08 pmLambert-St Louis

15h 58m

1 stop

SEA10:06 amSeattle/Tacoma Intl

May 28

SEA7:50 pmSeattle/Tacoma Intl

21h 33m

1 stop

STL7:23 pmLambert-St Louis

$230

Frontier

May 7

STL8:08 pmLambert-St Louis

15h 41m

1 stop

SEA9:49 amSeattle/Tacoma Intl

May 11

SEA7:50 pmSeattle/Tacoma Intl

35h 05m

2 stops

STL8:55 amLambert-St Louis

$234

Delta flights from Illinois to State of Washington

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

Delta

Jun 9

STL7:52 pmLambert-St Louis

6h 07m

1 stop

SEA11:59 pmSeattle/Tacoma Intl

Jun 17

SEA6:05 amSeattle/Tacoma Intl

8h 47m

1 stop

STL4:52 pmLambert-St Louis

$238

Delta

May 12

ORD12:47 pmChicago O'Hare Intl

4h 33m

SEA3:20 pmSeattle/Tacoma Intl

May 16

SEA10:59 amSeattle/Tacoma Intl

4h 14m

ORD5:13 pmChicago O'Hare Intl

$240

Delta

May 28

STL11:25 amLambert-St Louis

7h 50m

1 stop

PDX5:15 pmPortland

Jun 1

PDX11:12 pmPortland

8h 17m

1 stop

STL9:29 amLambert-St Louis

$243

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 4/30

9:55 pm-8:59 am

1 stop13h 04m

Portland

Sun 5/3

11:15 am-7:21 pm

1 stop6h 06m

$226

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 5/26

8:08 pm-10:06 am

1 stop15h 58m

Seattle/Tacoma Intl

Thu 5/28

7:50 pm-7:23 pm

1 stop21h 33m

$230

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Thu 5/7

5:20 am-10:48 am

1 stop7h 28m

Seattle/Tacoma Intl

Mon 5/11

2:10 pm-10:59 pm

1 stop6h 49m

$236

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Tue 6/9

7:52 pm-11:59 pm

1 stop6h 07m

Seattle/Tacoma Intl

Wed 6/17

6:05 am-4:52 pm

1 stop8h 47m

$238

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 5/12

12:47 pm-3:20 pm

Nonstop4h 33m

Seattle/Tacoma Intl

Sat 5/16

10:59 am-5:13 pm

Nonstop4h 14m

$240

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 9/2

7:00 am-12:50 pm

1 stop7h 50m

Seattle/Tacoma Intl

Wed 9/9

5:48 pm-11:59 pm

Nonstop4h 11m

$241

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Tue 5/12

8:00 pm-10:35 pm

Nonstop4h 35m

Portland

Sat 5/16

7:45 pm-5:40 am

1 stop7h 55m

$245

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Sat 5/9

8:00 pm-10:35 pm

Nonstop4h 35m

Portland

Wed 5/13

10:55 pm-5:02 am

Nonstop4h 07m

$251

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Fri 5/15

6:11 pm-11:54 pm

1 stop7h 43m

Portland

Tue 5/19

1:52 pm-10:59 pm

1 stop7h 07m

$271

Quickest round-trip

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 5/27

5:33 pm-7:50 pm

Nonstop4h 17m

Portland

Sat 5/30

10:37 am-4:37 pm

Nonstop4h 00m

$277

Flights are sorted by cheapest round-trip flights first.

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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 February is also cheap. Prices for this month can be found on momondo for an average of $235.

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 $332. 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 $452.

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 at noon when flights can be purchased for as low as $337. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $381 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 $286 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 $249 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?

You could potentially save up to 30% on your flight if you consider stops on a Illinois to State of Washington flight.

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	$196
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 $196. The best round-trip flight deal from Illinois to State of Washington found on momondo in the last 72 hours is $276.

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 Spokane (GEG).

Search flight deals

Frequently asked questions about flying from Illinois to Washington

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 April 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 16.81% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 15.55%, Airbus A321neo at 15.55%, and Boeing 737 MAX 9 at 14.48%.

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 $111	Free Cancellation	Rating 7.9 8,434 reviews	Search Delta flights
Frontier	PriceFrom $153	Free Cancellation	Rating 5.6 2,981 reviews	Search Frontier flights
Alaska Airlines	PriceFrom $168	Free Cancellation	Rating 7.9 12,269 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $174	Free Cancellation	Rating 7.1 11,645 reviews	Search American Airlines flights
United Airlines	PriceFrom $177	Free Cancellation	Rating 7.4 9,613 reviews	Search United Airlines flights
Southwest	PriceFrom $194	Free Cancellation	Rating 8.0 4,331 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 $85

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 5/12. 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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Frontier flights from Illinois to State of Washington

Our best Frontier 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

Frequently asked questions about flying from Illinois to 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

Popular cities in Washington

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According to popular flight searches on momondo this year

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