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$84+ 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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
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 July 31, 2025.

Round-trip from

$176
(Kiwi.com)

One-way from

$84
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$329

Good round-trip deal

$247 or less

Good one-way deal

$117 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. 5% potential increase in price ($15 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 31, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/30. 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 8/237:00 amORD - PDX
Nonstop4h 25mHawaiian Airlines
Sat 8/305:50 pmPDX - ORD
Nonstop4h 09mHawaiian Airlines
Deal found 7/30$176
This CheapOair deal was found by Cheapflights users on 7/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:00 amORD - PDX
1 stop7h 12mSpirit Airlines
Wed 10/298:04 pmPDX - ORD
1 stop6h 45mSpirit Airlines
Deal found 7/29$177
This Southwest deal was found by Cheapflights users on 7/30. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/302:10 pmMDW - PDX
Nonstop4h 15mSouthwest
Sun 8/316:55 amPDX - MDW
Nonstop4h 00mSouthwest
Deal found 7/30$179
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/307:00 amORD - PDX
Nonstop4h 25mAlaska Airlines
Sun 8/317:00 amPDX - ORD
Nonstop4h 09mAlaska Airlines
Deal found 7/30$179
This lastminute.com deal was found by Cheapflights users on 7/30. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:00 amORD - SEA
1 stop9h 26mAlaska Airlines
Sat 9/208:05 amSEA - ORD
Nonstop4h 19mAlaska Airlines
Deal found 7/30$181
This Southwest deal was found by Cheapflights users on 7/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/259:15 amMDW - SEA
Nonstop4h 35mSouthwest
Fri 10/315:45 amSEA - MDW
Nonstop4h 00mSouthwest
Deal found 7/29$184
This Delta deal was found by Cheapflights users on 7/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/237:15 amORD - SEA
Nonstop4h 30mDelta
Sat 8/305:50 pmSEA - ORD
Nonstop4h 01mDelta
Deal found 7/31$184
This Trip.com deal was found by Cheapflights users on 7/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1310:00 amORD - SEA
Nonstop4h 34mHawaiian Airlines
Sat 9/205:55 pmSEA - ORD
Nonstop4h 08mHawaiian Airlines
Deal found 7/30$185
This Trip.com deal was found by Cheapflights users on 7/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/161:01 pmORD - SEA
Nonstop4h 34mMultiple Airlines
Tue 9/235:55 pmSEA - ORD
Nonstop4h 08mMultiple Airlines
Deal found 7/30$188
This American Airlines deal was found by Cheapflights users on 7/29. 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.
Sat 10/116:01 pmORD - SEA
Nonstop4h 45mAmerican Airlines
Fri 10/1712:34 amSEA - ORD
Nonstop4h 08mAmerican Airlines
Deal found 7/29$190
This United Airlines deal was found by Cheapflights users on 7/31. 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.
Sat 9/67:10 amORD - SEA
Nonstop4h 33mUnited Airlines
Tue 9/98:00 amSEA - ORD
1 stop8h 25mUnited Airlines
Deal found 7/31$195
This American Airlines deal was found by Cheapflights users on 7/29. 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.
Wed 10/17:25 amORD - PDX
Nonstop4h 22mAmerican Airlines
Sat 10/41:12 pmPDX - ORD
Nonstop4h 16mAmerican Airlines
Deal found 7/29$197

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 July 31, 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

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Sat 8/23

7:00 am-9:25 am

Nonstop4h 25m

Portland

Sat 8/30

5:50 pm-11:59 pm

Nonstop4h 09m

$176

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Wed 10/1

6:00 am-11:12 am

1 stop7h 12m

Portland

Tue 10/7

12:07 pm-9:01 pm

1 stop6h 54m

$177

ChicagoPortland

MDW - PDX

MDWPDX

Chicago Midway

Sat 8/30

2:10 pm-4:25 pm

Nonstop4h 15m

Portland

Sun 8/31

6:55 am-12:55 pm

Nonstop4h 00m

$179

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Sat 8/30

7:00 am-9:25 am

Nonstop4h 25m

Portland

Sun 8/31

7:00 am-1:09 pm

Nonstop4h 09m

$179

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 9/13

7:00 am-2:26 pm

1 stop9h 26m

Seattle/Tacoma Intl

Sat 9/20

8:05 am-2:24 pm

Nonstop4h 19m

$181

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

$184

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 8/23

6:20 am-8:50 am

Nonstop4h 30m

Seattle/Tacoma Intl

Sun 8/31

5:55 pm-11:59 pm

Nonstop4h 04m

$184

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Sun 8/31

1:05 pm-3:25 pm

Nonstop4h 20m

Portland

Wed 9/3

2:15 pm-8:25 pm

Nonstop4h 10m

$188

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 9/16

1:01 pm-3:35 pm

Nonstop4h 34m

Seattle/Tacoma Intl

Tue 9/23

5:55 pm-12:03 am

Nonstop4h 08m

$188

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 9/3

7:15 am-9:45 am

Nonstop4h 30m

Seattle/Tacoma Intl

Wed 9/10

5:50 pm-11:51 pm

Nonstop4h 01m

$189

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

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 $389). 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 July 31, 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 July 31, 2025.

The most flights from USIL to USWA are scheduled on a Thursday (73 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (30 on average).

How much does it cost to fly round-trip from Illinois to State of Washington?

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 July 31, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta 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

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,246 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Hawaiian Airlines
7.8
Good
2,611 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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.

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

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $84. Delta flights start at $89 while deals on Alaska 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 $389). 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.

See more FAQs

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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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$92Average$250FlexibilityNo cancel feeOn-time85%
Spirit AirlinesCheapest$98Average$198FlexibilityNo cancel feeOn-time65%
FrontierCheapest$118Average$240FlexibilityNo cancel feeOn-time62%
DeltaCheapest$122Average$332FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$156Average$482FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$167Average$483FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$168Average$477FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$194Average$449FlexibilityNo cancel feeOn-time63%

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