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

Frontier, Southwest, and Hawaiian 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 September 2025, there are 100 flights per day flying from Illinois to State of Washington. The most common time of day flights depart is 5:00PM, with 48% of flights taking off in the afternoon.

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 31% of people opting to fly with this airline when traveling to State of Washington. Keep in mind that there are 8 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 38m, respectively.

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

As of September 2025, 706 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 16% 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 September 2025, 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.

$79 Cheap Flights from Illinois to Washington in 2025/26

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Find the cheapest flights from Illinois to Washington

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

12:11 pm - 12:07 pmMDW-SEA

25h 56m1 stop

10:16 am - 11:20 pmSEA-MDW

11h 04m1 stop

$166Frontier

Find Deal

Fri, Oct 24 - Mon, Oct 27

7:15 am - 12:07 pmORD-SEA

6h 52m1 stop

9:58 pm - 12:58 pmSEA-ORD

13h 00m1 stop

$166Frontier

Find Deal

Wed, Oct 15 - Sun, Oct 19

10:05 am - 12:45 pmORD-SEA

4h 40mnonstop

3:31 pm - 9:40 pmSEA-ORD

4h 09mnonstop

$191Alaska Airlines

Find Deal

Tue, Oct 21 - Tue, Oct 28

7:47 pm - 10:30 pmORD-SEA

4h 43mnonstop

11:59 pm - 5:58 amSEA-ORD

3h 59mnonstop

$194United Airlines

Find Deal

Sat, Oct 25 - Fri, Oct 31

3:50 pm - 10:41 pmORD-GEG

8h 51m1 stop

7:00 am - 6:59 pmGEG-ORD

9h 59m1 stop

$196Alaska Airlines

Find Deal

Tue, Oct 21 - Tue, Oct 28

9:20 am - 4:51 pmMDW-PDX

9h 31m1 stop

12:55 am - 8:54 amPDX-MDW

5h 59m1 stop

$207Delta

Find Deal

Wed, Feb 18 - Fri, Feb 20

7:37 am - 10:15 amORD-SEA

4h 38mnonstop

5:55 pm - 11:50 pmSEA-ORD

3h 55mnonstop

$209Delta

Find Deal

Wed, Oct 15 - Wed, Nov 5

9:30 am - 11:42 amORD-GEG

4h 12mnonstop

11:25 am - 5:02 pmGEG-ORD

3h 37mnonstop

$215United Airlines

Find Deal

Tue, Oct 21 - Tue, Oct 28

8:32 pm - 11:06 pmORD-PDX

4h 34mnonstop

11:58 pm - 5:53 amPDX-ORD

3h 55mnonstop

$222American Airlines

Find Deal

Fri, Oct 24 - Fri, Oct 31

10:30 am - 12:20 pmORD-GEG

3h 50mnonstop

1:12 pm - 7:04 pmGEG-ORD

3h 52mnonstop

$246American Airlines

Find Deal

Tue, Oct 14 - Sat, Oct 18

United Airlines flights from Illinois to State of Washington

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

United Airlines

Oct 25

ORD7:47 pmChicago O'Hare Intl

4h 43m

SEA10:30 pmSeattle/Tacoma Intl

Oct 31

SEA11:59 pmSeattle/Tacoma Intl

3h 59m

ORD5:58 amChicago O'Hare Intl

$194

Find similar

United Airlines

Oct 21

ORD9:30 amChicago O'Hare Intl

4h 12m

GEG11:42 amSpokane

Oct 28

GEG11:25 amSpokane

3h 37m

ORD5:02 pmChicago O'Hare Intl

$215

Find similar

United Airlines

Oct 22

ORD2:53 pmChicago O'Hare Intl

8h 41m

1 stop

SEA9:34 pmSeattle/Tacoma Intl

Oct 29

SEA1:30 pmSeattle/Tacoma Intl

4h 12m

ORD7:42 pmChicago O'Hare Intl

$219

Find similar

Frontier flights from Illinois to State of Washington

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

Frontier

Oct 24

MDW12:11 pmChicago Midway

25h 56m

1 stop

SEA12:07 pmSeattle/Tacoma Intl

Oct 27

SEA10:16 amSeattle/Tacoma Intl

11h 04m

1 stop

MDW11:20 pmChicago Midway

$166

Find similar

Frontier

Oct 22

ORD7:15 amChicago O'Hare Intl

6h 52m

1 stop

SEA12:07 pmSeattle/Tacoma Intl

Oct 27

SEA10:16 amSeattle/Tacoma Intl

13h 15m

1 stop

ORD1:31 amChicago O'Hare Intl

$172

Find similar

Frontier

Oct 20

ORD6:50 amChicago O'Hare Intl

7h 17m

1 stop

SEA12:07 pmSeattle/Tacoma Intl

Oct 23

SEA1:02 pmSeattle/Tacoma Intl

8h 51m

1 stop

ORD11:53 pmChicago O'Hare Intl

$174

Find similar

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Fri 10/24

12:11 pm-12:07 pm

1 stop25h 56m

Seattle/Tacoma Intl

Mon 10/27

10:16 am-11:20 pm

1 stop11h 04m

$166

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 10/15

7:15 am-12:07 pm

1 stop6h 52m

Seattle/Tacoma Intl

Sun 10/19

9:58 pm-12:58 pm

1 stop13h 00m

$166

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 10/21

10:05 am-12:45 pm

Nonstop4h 40m

Seattle/Tacoma Intl

Tue 10/28

3:31 pm-9:40 pm

Nonstop4h 09m

$191

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 10/25

7:47 pm-10:30 pm

Nonstop4h 43m

Seattle/Tacoma Intl

Fri 10/31

11:59 pm-5:58 am

Nonstop3h 59m

$194

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Tue 10/21

3:50 pm-10:41 pm

1 stop8h 51m

Spokane

Tue 10/28

7:00 am-6:59 pm

1 stop9h 59m

$196

ChicagoPortland

MDW - PDX

MDWPDX

Chicago Midway

Wed 2/18

9:20 am-4:51 pm

1 stop9h 31m

Portland

Fri 2/20

12:55 am-8:54 am

1 stop5h 59m

$207

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 10/15

7:37 am-10:15 am

Nonstop4h 38m

Seattle/Tacoma Intl

Wed 11/5

5:55 pm-11:50 pm

Nonstop3h 55m

$209

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Tue 10/21

9:30 am-11:42 am

Nonstop4h 12m

Spokane

Tue 10/28

11:25 am-5:02 pm

Nonstop3h 37m

$215

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Fri 10/24

8:32 pm-11:06 pm

Nonstop4h 34m

Portland

Fri 10/31

11:58 pm-5:53 am

Nonstop3h 55m

$222

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Tue 10/14

10:30 am-12:20 pm

Nonstop3h 50m

Spokane

Sat 10/18

1:12 pm-7:04 pm

Nonstop3h 52m

$246

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 February is, on average, the cheapest month to fly to State of Washington from Illinois, with most prices found around $218. If you aren’t able to travel to State of Washington during the month of February, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $229.

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 $339. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to State of Washington for around $451.

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 $330. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $376 on average. Flights to State of Washington from Illinois in the morning 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 $285 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?

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	$150
Fastest flight time	3h 50m
Direct flights	Every day
Airports in State of Washington	1 airport

The best one-way flight to State of Washington from Illinois in the past 72 hours is $150. The best round-trip flight deal from Illinois to State of Washington found on momondo in the last 72 hours is $189.

The fastest flight from Illinois to State of Washington takes 3h 50m

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

There is 1 airport near State of Washington: 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 September 2025, 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 Passenger/BBJ3 (winglets), representing 18.60% of all bookings. The subsequent popular models are Boeing 737-800 at 14.01%, Boeing 737 MAX 9 at 12.14%, and Airbus A321neo at 10.55%.

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 $91	Free Cancellation	Rating 7.8 2,743 reviews	Search Hawaiian Airlines flights
Spirit Airlines	PriceFrom $97	Free Cancellation	Rating 6.3 8,031 reviews	Search Spirit Airlines flights
Delta	PriceFrom $121	Free Cancellation	Rating 7.9 7,971 reviews	Search Delta flights
Frontier	PriceFrom $127	Free Cancellation	Rating 5.8 3,166 reviews	Search Frontier flights
Alaska Airlines	PriceFrom $169	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $169	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
United Airlines	PriceFrom $175	Free Cancellation	Rating 7.4 8,922 reviews	Search United Airlines flights
Southwest	PriceFrom $194	Free Cancellation	Rating 8.0 4,244 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

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.

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Cheap flights from Illinois to Washington from $79

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 11/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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

Find the cheapest flights from Illinois to Washington

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

United Airlines flights from Illinois to State of Washington

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

Frontier flights from Illinois to State of Washington

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

momondo Fare Finder

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

See travel insights to Washington from

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

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?

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?

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.

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

Frontier, Southwest, and Hawaiian Airlines are the most popular carriers operating 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?

As of September 2025, there are 100 flights per day flying from Illinois to State of Washington. The most common time of day flights depart is 5:00PM, with 48% of flights taking off in the afternoon.

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

As of September 2025, 706 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 16% of weekly flights taking off on this day.

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 38m, respectively.

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

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

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

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

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

What is the most popular plane model from Illinois to 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?

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

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

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

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

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

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