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$72+ Cheap flights from Illinois to Washington

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Illinois to Washington

Keep the following information in mind while searching for Illinois to Washington flight deals. Data was last updated September 15, 2025.

Round-trip from

$176
(Kiwi.com)

One-way from

$72
(Southwest)

Popular in

December

Cheapest in

February

Average price

$249

Good round-trip deal

$189 or less

Good one-way deal

$157 or less
From Illinois to Washington
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One-way flight from Illinois to Washington
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Highest demand for flights based on searches. 6% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Illinois to Washington.
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Price to beat on a one-way flight from Illinois to Washington.
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Find flight deals from Illinois to Washington

Cheapest flights from Illinois to Washington
Explore the most affordable flight options available from Illinois to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/299:20 amORD - SEA
1 stop9h 45mAlaska Airlines
Sun 11/212:20 amSEA - ORD
Nonstop4h 02mAlaska Airlines
Deal found 9/13$176
This United Airlines deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:28 pmORD - SEA
1 stop7h 01mUnited Airlines
Mon 10/67:00 amSEA - ORD
Nonstop4h 15mUnited Airlines
Deal found 9/12$177
This Priceline deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:50 amORD - SEA
1 stop7h 17mFrontier
Tue 10/141:02 pmSEA - ORD
1 stop8h 51mFrontier
Deal found 9/13$178
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:05 amORD - SEA
1 stop7h 02mMultiple Airlines
Fri 10/316:15 pmSEA - ORD
Nonstop4h 09mMultiple Airlines
Deal found 9/14$179
This Booking.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/610:32 amORD - SEA
1 stop27h 35mFrontier
Mon 10/138:43 pmSEA - ORD
1 stop25h 10mFrontier
Deal found 9/13$180
This Priceline deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/34:48 pmMDW - SEA
1 stop9h 42mFrontier
Fri 10/1010:16 amSEA - MDW
1 stop11h 04mFrontier
Deal found 9/14$181
This Orbitz deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/315:53 pmORD - SEA
Nonstop4h 42mMultiple Airlines
Mon 11/33:01 pmSEA - ORD
1 stop7h 14mMultiple Airlines
Deal found 9/14$181
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3012:30 pmMDW - SEA
1 stop25h 43mFrontier
Thu 11/61:08 pmSEA - MDW
1 stop20h 22mFrontier
Deal found 9/15$182
This Kiwi.com deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/115:59 pmORD - SEA
Nonstop4h 36mMultiple Airlines
Sun 10/129:58 pmSEA - ORD
1 stop13h 00mMultiple Airlines
Deal found 9/12$182
This Booking.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/176:24 pmMDW - SEA
1 stop19h 43mFrontier
Sat 10/258:43 pmSEA - MDW
1 stop25h 53mFrontier
Deal found 9/13$183
This Kiwi.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/217:15 amORD - SEA
1 stop6h 52mMultiple Airlines
Fri 10/316:15 pmSEA - ORD
Nonstop4h 09mMultiple Airlines
Deal found 9/14$184
This American Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/35:35 pmORD - SEA
Nonstop4h 34mAmerican Airlines
Sun 10/512:34 amSEA - ORD
Nonstop4h 08mAmerican Airlines
Deal found 9/13$185

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from Illinois to Washington that are best for you.

Fly from

Illinois

Fly to

Washington

Route

Depart

Return

Price

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 10/14

4:10 pm-6:49 pm

Nonstop4h 39m

Seattle/Tacoma Intl

Fri 10/17

11:40 pm-5:40 am

Nonstop4h 00m

$185

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Sat 10/25

9:15 am-11:50 am

Nonstop4h 35m

Seattle/Tacoma Intl

Fri 10/31

5:45 am-11:45 am

Nonstop4h 00m

$194

ChicagoSpokane

ORD - GEG

ORDGEG

Chicago O'Hare Intl

Thu 11/6

6:00 am-12:26 pm

1 stop8h 26m

Spokane

Mon 11/10

7:39 pm-6:22 am

1 stop8h 43m

$195

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 10/25

7:00 am-2:35 pm

1 stop9h 35m

Seattle/Tacoma Intl

Fri 10/31

6:15 pm-12:24 am

Nonstop4h 09m

$204

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Tue 10/21

7:59 pm-9:44 am

1 stop15h 45m

Portland

Wed 10/29

11:00 pm-5:01 am

Nonstop4h 01m

$208

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Sat 10/25

7:00 am-9:32 am

Nonstop4h 32m

Portland

Fri 10/31

11:00 pm-5:01 am

Nonstop4h 01m

$209

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 10/21

2:25 pm-5:00 pm

Nonstop4h 35m

Seattle/Tacoma Intl

Tue 10/28

11:15 am-5:10 pm

Nonstop3h 55m

$209

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 11/19

3:25 pm-6:04 pm

Nonstop4h 39m

Seattle/Tacoma Intl

Fri 11/21

12:25 am-6:28 am

Nonstop4h 03m

$209

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 10/22

2:25 pm-5:00 pm

Nonstop4h 35m

Seattle/Tacoma Intl

Sat 10/25

5:55 pm-11:54 pm

Nonstop3h 59m

$209

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 11/1

8:00 am-10:44 am

Nonstop4h 44m

Seattle/Tacoma Intl

Wed 11/5

6:15 pm-12:24 am

Nonstop4h 09m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/12

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Illinois with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Washington

What is the cheapest month to book a flight from Illinois to State of Washington?

Currently, January is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $238). Flying from Illinois to State of Washington in June is currently the most expensive (average of $387). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to WA?

Find hourly flight availability from Illinois to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to State of Washington as you normally would.

Weekly flight availability from Illinois to State of Washington

Explore weekly flight availability from Illinois to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 15, 2025.

The most flights from USIL to USWA are scheduled on a Monday (58 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (41 on average).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated September 15, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines from Illinois to Washington have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Delta
8.0
Very good
7,954 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Hawaiian Airlines
7.8
Good
2,723 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
United Airlines
7.4
Good
8,929 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Comfort

7.8

Entertainment

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

Related info for your journey

Find useful and relevant information for your journey from Illinois to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    Airlines like United Airlines, Southwest, and Alaska Airlines fly from Illinois to State of Washington in about 4h 35m. The time it takes to get you to your destination can typically vary by up to 3h 51m. Illinois and State of Washington are separated by a distance of 1728 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Illinois to State of Washington one-way?

    To fly one-way, consider booking your trip with Southwest, which is currently one of the cheapest options available, starting at $72. Frontier flights start at $79 while deals on Hawaiian Airlines start at $97 one-way.

  • Can I find deals for flights from Illinois to Washington that include hotel bookings?

    Yes. In addition to deals on Illinois to Washington flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Washington.

  • Can I find deals for business class flights from Illinois to Washington?

    Yes. Cheapflights offers flight deals from Illinois to Washington by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to State of Washington?

    Currently, January is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $238). Flying from Illinois to State of Washington in June is currently the most expensive (average of $387). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Alternative routes for Illinois to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from Illinois to Washington

Discover the top 8 airlines that operate flights from Illinois to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$91Average$251FlexibilityNo cancel feeOn-time85%
Spirit AirlinesCheapest$97Average$207FlexibilityNo cancel feeOn-time65%
DeltaCheapest$122Average$332FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$127Average$265FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$169Average$496FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$171Average$473FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$178Average$478FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$194Average$451FlexibilityNo cancel feeOn-time63%

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