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$62+ 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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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 October 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$123
(Kiwi.com)

One-way from

$62
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$257

Good round-trip deal

$248 or less

Good one-way deal

$136 or less
Provider with most accurate pricing for Chicago (CHI)-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Seattle/Tacoma Intl flights.
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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 ($16 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 October 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 October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/67:43 pmSTL - PDX
1 stop18h 13mFrontier
Fri 12/1212:55 pmPDX - STL
1 stop19h 19mFrontier
Deal found 10/29$123
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 12/37:43 pmSTL - PDX
1 stop18h 13mFrontier
Fri 12/512:55 pmPDX - STL
1 stop19h 19mFrontier
Deal found 10/28$124
This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/41:16 pmSTL - PDX
1 stop22h 18mFrontier
Thu 12/1112:51 pmPDX - STL
1 stop19h 23mFrontier
Deal found 10/28$151
This Mytrip deal was found by Cheapflights users on 10/28. 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.
Wed 11/126:05 pmORD - GEG
1 stop19h 03mFrontier
Sun 11/1612:03 pmGEG - ORD
1 stop10h 12mFrontier
Deal found 10/28$171
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/139:22 pmORD - SEA
2 stops23h 10mMultiple Airlines
Thu 11/271:01 pmSEA - ORD
1 stop9h 09mMultiple Airlines
Deal found 10/29$173
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Thu 11/136:00 amORD - SEA
2 stops14h 32mFrontier
Mon 11/172:22 pmSEA - ORD
1 stop27h 16mFrontier
Deal found 10/28$174
This WAYA deal was found by Cheapflights users on 10/29. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/68:00 amORD - SEA
Nonstop4h 52mMultiple Airlines
Sun 12/1412:48 pmSEA - ORD
1 stop9h 24mMultiple Airlines
Deal found 10/29$175
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 11/116:05 pmORD - SEA
1 stop20h 02mFrontier
Mon 11/1711:43 amSEA - ORD
2 stops29h 55mFrontier
Deal found 10/28$176
This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/87:45 pmSTL - PDX
1 stop18h 11mFrontier
Sat 11/1512:52 pmPDX - STL
1 stop18h 15mFrontier
Deal found 10/28$177
This United Airlines deal was found by Cheapflights users on 10/28. 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 12/127:45 pmORD - SEA
Nonstop4h 43mUnited Airlines
Sun 12/147:00 amSEA - ORD
Nonstop4h 09mUnited Airlines
Deal found 10/28$177
This Booking.com deal was found by Cheapflights users on 10/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/116:05 pmORD - SEA
1 stop20h 02mFrontier
Thu 11/1312:58 pmSEA - ORD
1 stop9h 17mFrontier
Deal found 10/29$178
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 12/207:43 pmSTL - PDX
1 stop18h 00mFrontier
Sun 1/412:47 pmPDX - STL
1 stop19h 15mFrontier
Deal found 10/27$179

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 October 30, 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

Wed 1/7

2:20 pm-5:00 pm

Nonstop4h 40m

Seattle/Tacoma Intl

Sun 1/11

5:55 pm-11:53 pm

Nonstop3h 58m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 1/6

8:50 am-11:32 am

Nonstop4h 42m

Seattle/Tacoma Intl

Sun 1/11

2:10 pm-8:17 pm

Nonstop4h 07m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 1/14

7:30 am-10:15 am

Nonstop4h 45m

Seattle/Tacoma Intl

Wed 1/21

7:10 am-1:22 pm

Nonstop4h 12m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 2/14

9:00 am-11:49 am

Nonstop4h 49m

Seattle/Tacoma Intl

Sat 2/28

7:00 am-1:06 pm

Nonstop4h 06m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 2/26

7:30 am-10:15 am

Nonstop4h 45m

Seattle/Tacoma Intl

Sun 3/8

7:20 am-1:25 pm

Nonstop4h 05m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 1/7

6:06 pm-9:00 pm

Nonstop4h 54m

Seattle/Tacoma Intl

Sun 1/11

9:45 pm-1:10 pm

1 stop13h 25m

$187

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sun 1/18

2:06 pm-6:46 pm

1 stop6h 40m

Seattle/Tacoma Intl

Tue 1/27

8:30 am-2:38 pm

Nonstop4h 08m

$187

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 1/5

8:00 am-10:47 am

Nonstop4h 47m

Seattle/Tacoma Intl

Tue 1/6

5:20 am-1:16 pm

1 stop5h 56m

$197

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 12/17

7:50 am-10:41 am

Nonstop4h 51m

Seattle/Tacoma Intl

Fri 1/16

5:55 pm-11:53 pm

Nonstop3h 58m

$197

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 12/30

7:55 pm-10:47 pm

Nonstop4h 52m

Seattle/Tacoma Intl

Fri 1/9

12:35 pm-11:14 pm

1 stop8h 39m

$203

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

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, September is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $113). Flying from Illinois to State of Washington in December is currently the most expensive (average of $177). 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 October 30, 2025.

It’s typically best to fly out from Illinois to State of Washington in the evening. Doing so could potentially save you 37% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Illinois to State of Washington?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Washington. Price data was last updated on November 18, 2024.

Travelers seeking maximum savings on their Illinois to State of Washington flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 30, 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
11,217 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

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
11,217 reviews
Alaska Airlines
8.0
Very good
11,217 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

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
7.9
Good
7,998 reviews
Alaska Airlines
8.0
Very good
11,217 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

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
2,797 reviews
Alaska Airlines
8.0
Very good
11,217 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

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
8,998 reviews
Alaska Airlines
8.0
Very good
11,217 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

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
11,035 reviews
Alaska Airlines
8.0
Very good
11,217 reviews

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Boarding

8.1

Entertainment

7.0

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 Delta, United Airlines, and Southwest fly from Illinois to State of Washington in about 4h 40m. The time it takes to get you to your destination is usually consistent. Illinois and State of Washington are separated by a distance of 1715 mi. Most flights are nonstop.

  • 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 $79. Alaska Airlines flights start at $98 while deals on Delta start at $119 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, September is the cheapest month in which you can book a flight from Illinois to State of Washington (average of $113). Flying from Illinois to State of Washington in December is currently the most expensive (average of $177). 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

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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$91Average$251FlexibilityNo cancel feeOn-time85%
Spirit AirlinesCheapest$105Average$202FlexibilityNo cancel feeOn-time65%
DeltaCheapest$122Average$339FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$142Average$264FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$169Average$476FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$172Average$462FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$176Average$466FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$189Average$454FlexibilityNo cancel feeOn-time63%

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