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 28m and 6h 45m, 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 week?

As of June 2026, 529 flights take off from Illinois and land in State of Washington each week. The most common flight departure day for this route is Tue, with 21% of weekly flights taking off on this day.

What airlines fly to State of Washington?

American Airlines, Alaska Airlines and United Airlines are the top three most popular airlines that fly to State of Washington from Illinois 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 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 day?

As of June 2026, there are 75 flights per day flying from Illinois to State of Washington. The most common time of day flights depart is 9:00PM, with 36% 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 June 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.

$106 Cheap Flights from Illinois to Washington in 2026

Discover deals from 900+ travel sites with momondo.

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.

6:48 pm - 11:59 pm

PIA

SEA

7h 11m

1 stop

6:15 am - 4:58 pm

SEA

PIA

8h 43m

1 stop

$271American Airlines

Wed, Sep 2 - Wed, Sep 9

8:25 am - 1:55 pm

STL

PDX

7h 30m

1 stop

11:35 am - 10:45 pm

PDX

STL

9h 10m

1 stop

$285Southwest

Mon, Oct 12 - Sat, Oct 17

8:08 pm - 4:51 pm

STL

PDX

22h 43m

1 stop

5:42 pm - 2:48 pm

PDX

STL

19h 06m

2 stops

$295Frontier

Wed, Aug 12 - Tue, Aug 18

8:00 am - 12:15 pm

STL

PDX

6h 15m

1 stop

5:10 pm - 12:34 am

PDX

STL

5h 24m

1 stop

$305Delta

Thu, Sep 17 - Mon, Sep 21

7:20 am - 9:45 am

ORD

PDX

4h 25mnonstop

10:59 pm - 5:00 am

PDX

ORD

4h 01mnonstop

$310Alaska Airlines

Wed, Jul 1 - Wed, Jul 8

7:10 pm - 11:08 am

STL

SEA

17h 58m

1 stop

8:13 pm - 7:36 pm

SEA

STL

21h 23m

1 stop

$310Frontier

Sun, Aug 9 - Thu, Aug 20

8:12 pm - 10:52 pm

ORD

PDX

4h 40mnonstop

8:25 am - 6:37 pm

PDX

ORD

8h 12m

1 stop

$311United Airlines

Tue, Sep 8 - Tue, Sep 15

7:17 pm - 11:35 pm

ORD

PDX

6h 18m

1 stop

10:59 pm - 5:00 am

PDX

ORD

4h 01mnonstop

$313Alaska Airlines

Sat, Jul 11 - Sat, Jul 18

3:55 pm - 8:17 pm

ORD

PDX

6h 22m

1 stop

5:30 am - 1:28 pm

PDX

ORD

5h 58m

1 stop

$314Delta

Sat, Jun 27 - Tue, Jul 7

5:30 pm - 10:43 pm

STL

SEA

7h 13m

1 stop

7:00 am - 3:38 pm

SEA

STL

6h 38m

1 stop

$318United Airlines

Mon, Aug 17 - Wed, Aug 26

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Frontier flights from Illinois to State of Washington

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

Frontier

Aug 12

STL8:08 pmLambert-St Louis

22h 43m

1 stop

PDX4:51 pmPortland

Aug 18

PDX5:42 pmPortland

19h 06m

2 stops

STL2:48 pmLambert-St Louis

$295

Frontier

Aug 9

STL7:10 pmLambert-St Louis

17h 58m

1 stop

SEA11:08 amSeattle/Tacoma Intl

Aug 20

SEA8:13 pmSeattle/Tacoma Intl

21h 23m

1 stop

STL7:36 pmLambert-St Louis

$310

Frontier

Aug 18

STL6:58 pmLambert-St Louis

17h 37m

1 stop

SEA10:35 amSeattle/Tacoma Intl

Aug 25

SEA8:13 pmSeattle/Tacoma Intl

21h 10m

2 stops

STL7:23 pmLambert-St Louis

$319

American Airlines flights from Illinois to State of Washington

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

American Airlines

Sep 2

PIA6:48 pmGreater Peoria

7h 11m

1 stop

SEA11:59 pmSeattle/Tacoma Intl

Sep 9

SEA6:15 amSeattle/Tacoma Intl

8h 43m

1 stop

PIA4:58 pmGreater Peoria

$271

American Airlines

Sep 12

MLI4:57 pmMoline Quad-City

9h 10m

1 stop

PDX12:07 amPortland

Sep 19

PDX7:00 amPortland

7h 03m

1 stop

MLI4:03 pmMoline Quad-City

$291

American Airlines

Jul 30

STL7:56 pmLambert-St Louis

6h 54m

1 stop

PDX12:50 amPortland

Aug 4

PDX3:31 pmPortland

6h 27m

1 stop

STL11:58 pmLambert-St Louis

$304

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PeoriaSeattle

PIA - SEA

PIASEA

Greater Peoria

Wed 9/2

6:48 pm-11:59 pm

1 stop7h 11m

Seattle/Tacoma Intl

Wed 9/9

6:15 am-4:58 pm

1 stop8h 43m

$271

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Mon 10/12

8:25 am-1:55 pm

1 stop7h 30m

Portland

Sat 10/17

11:35 am-10:45 pm

1 stop9h 10m

$285

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Wed 8/12

8:08 pm-4:51 pm

1 stop22h 43m

Portland

Tue 8/18

5:42 pm-2:48 pm

2 stops19h 06m

$295

St. LouisPortland

STL - PDX

STLPDX

Lambert-St Louis

Thu 9/17

8:00 am-12:15 pm

1 stop6h 15m

Portland

Mon 9/21

5:10 pm-12:34 am

1 stop5h 24m

$305

Quickest round-trip

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Wed 7/1

7:20 am-9:45 am

Nonstop4h 25m

Portland

Wed 7/8

10:59 pm-5:00 am

Nonstop4h 01m

$310

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Sun 8/9

7:10 pm-11:08 am

1 stop17h 58m

Seattle/Tacoma Intl

Thu 8/20

8:13 pm-7:36 pm

1 stop21h 23m

$310

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Tue 9/8

8:12 pm-10:52 pm

Nonstop4h 40m

Portland

Tue 9/15

8:25 am-6:37 pm

1 stop8h 12m

$311

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Sat 7/11

7:17 pm-11:35 pm

1 stop6h 18m

Portland

Sat 7/18

10:59 pm-5:00 am

Nonstop4h 01m

$313

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Sat 6/27

3:55 pm-8:17 pm

1 stop6h 22m

Portland

Tue 7/7

5:30 am-1:28 pm

1 stop5h 58m

$314

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Mon 8/17

5:30 pm-10:43 pm

1 stop7h 13m

Seattle/Tacoma Intl

Wed 8/26

7:00 am-3:38 pm

1 stop6h 38m

$318

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 August is, on average, the cheapest month to fly to State of Washington from Illinois, with most prices found around $286. If you aren’t able to travel to State of Washington during the month of August, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $289.

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 Friday. Travelers who choose to depart for State of Washington on a Friday will often find tickets for as low as $357. 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 $460.

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 $364. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $401 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 O'Hare Intl to Spokane for the best Illinois - Washington flight prices

How far in advance should I book a flight from Illinois to 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 $303 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 $276 on momondo.

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

There are 4 cabin classes available to choose from on Illinois to State of 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 44% 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	$177
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 $177. The best round-trip flight deal from Illinois to State of Washington found on momondo in the last 72 hours is $355.

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).

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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 June 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 737-900, representing 17.38% of all bookings. The subsequent popular models are Airbus A321neo at 14.58%, Airbus A321-100/200 at 14.53%, and Boeing 737-800 at 13.41%.

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 2,830 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $119	Free Cancellation	Rating 7.9 8,393 reviews	Search Delta flights
Frontier	PriceFrom $131	Free Cancellation	Rating 5.6 2,899 reviews	Search Frontier flights
Alaska Airlines	PriceFrom $169	Free Cancellation	Rating 7.9 12,480 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $177	Free Cancellation	Rating 7.1 11,640 reviews	Search American Airlines flights
United Airlines	PriceFrom $177	Free Cancellation	Rating 7.4 9,801 reviews	Search United Airlines flights
Southwest	PriceFrom $194	Free Cancellation	Rating 7.9 4,237 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 $106

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 9/2. 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

American Airlines flights from Illinois to State of Washington

Our best American Airlines 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 from Illinois to Washington?

What cabin class options are available on Illinois to State of 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

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Illinois flight routes

According to popular flight searches on momondo this year

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