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$68+ Cheap flights from Washington to Illinois

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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ORD
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap flight deals from Washington to Illinois

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

This Alaska Airlines deal was found by Cheapflights users on 12/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:49 pmSEA - ORD
Nonstop4h 10mAlaska Airlines
Sat 1/173:35 pmORD - SEA
Nonstop4h 47mAlaska Airlines
Deal found 12/13$177
This Alaska Airlines deal was found by Cheapflights users on 12/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:49 pmSEA - ORD
Nonstop4h 10mAlaska Airlines
Mon 1/56:00 amORD - SEA
Nonstop4h 45mAlaska Airlines
Deal found 12/15$217
This Alaska Airlines deal was found by Cheapflights users on 12/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/254:59 pmSEA - ORD
1 stop10h 03mAlaska Airlines
Mon 1/56:00 amORD - SEA
Nonstop4h 45mAlaska Airlines
Deal found 12/12$237
This Kiwi.com deal was found by Cheapflights users on 12/14. 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.
Wed 12/243:59 pmPDX - ORD
2 stops20h 18mFrontier
Thu 1/152:30 pmORD - PDX
1 stop22h 34mFrontier
Deal found 12/14$246
This United Airlines deal was found by Cheapflights users on 12/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/313:50 pmSEA - ORD
1 stop6h 09mUnited Airlines
Sat 1/172:40 pmORD - SEA
1 stop8h 32mUnited Airlines
Deal found 12/13$247
This Alaska Airlines deal was found by Cheapflights users on 12/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2912:25 amSEA - ORD
Nonstop4h 04mAlaska Airlines
Tue 1/63:37 pmORD - SEA
1 stop9h 58mAlaska Airlines
Deal found 12/14$257
This Expedia deal was found by Cheapflights users on 12/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2812:25 amSEA - ORD
Nonstop4h 04mMultiple Airlines
Mon 1/57:00 amORD - SEA
1 stop7h 30mMultiple Airlines
Deal found 12/14$261
This United Airlines deal was found by Cheapflights users on 12/12. 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.
Wed 12/314:00 pmGEG - ORD
1 stop5h 59mUnited Airlines
Sat 1/38:08 pmORD - GEG
Nonstop4h 22mUnited Airlines
Deal found 12/12$262
This Alaska Airlines deal was found by Cheapflights users on 12/12. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:50 pmSEA - ORD
1 stop15h 26mAlaska Airlines
Tue 1/206:06 pmORD - SEA
Nonstop4h 50mAlaska Airlines
Deal found 12/12$267
This Frontier deal was found by Cheapflights users on 12/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:25 pmSEA - ORD
1 stop8h 47mFrontier
Sun 1/410:49 pmORD - SEA
1 stop13h 22mFrontier
Deal found 12/12$268
This Expedia deal was found by Cheapflights users on 12/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:49 pmSEA - ORD
Nonstop4h 10mMultiple Airlines
Sun 1/410:49 pmORD - SEA
1 stop13h 22mMultiple Airlines
Deal found 12/13$270
This American Airlines deal was found by Cheapflights users on 12/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:07 amGEG - ORD
Nonstop3h 50mAmerican Airlines
Sat 1/37:19 pmORD - GEG
Nonstop4h 09mAmerican Airlines
Deal found 12/15$270

Find flight deals from Washington to Illinois

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

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$176
(Kiwi.com)

One-way from

$68
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$382

Good round-trip deal

$315 or less

Good one-way deal

$170 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Chicago (CHI) flights.
Search Deals
From Washington to Illinois
Search Deals
One-way flight from Washington to Illinois
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Washington to Illinois.
Search Deals
Price to beat on a one-way flight from Washington to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to Illinois 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 December 15, 2025.
Use the filters below to find and compare flights from Washington to Illinois that are best for you.

Fly from

Washington

Fly to

Illinois

Route

Depart

Return

Price

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 1/17

5:50 pm-11:50 pm

Nonstop4h 00m

Chicago O'Hare Intl

Sun 1/18

6:06 pm-8:56 pm

Nonstop4h 50m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 1/16

2:10 pm-8:17 pm

Nonstop4h 07m

Chicago O'Hare Intl

Mon 1/19

7:54 pm-10:43 pm

Nonstop4h 49m

$177

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Fri 1/16

6:35 am-12:35 pm

Nonstop4h 00m

Chicago Midway

Mon 1/19

8:05 am-10:50 am

Nonstop4h 45m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 1/15

2:10 pm-8:17 pm

Nonstop4h 07m

Chicago O'Hare Intl

Sun 1/18

1:20 pm-4:01 pm

Nonstop4h 41m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 1/15

11:00 am-5:10 pm

Nonstop4h 10m

Chicago O'Hare Intl

Tue 1/20

6:06 pm-8:56 pm

Nonstop4h 50m

$177

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Tue 1/6

6:45 am-12:40 pm

Nonstop3h 55m

Chicago Midway

Thu 1/29

10:35 am-1:15 pm

Nonstop4h 40m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 2/17

11:59 pm-5:56 am

Nonstop3h 57m

Chicago O'Hare Intl

Mon 2/23

7:59 pm-10:43 pm

Nonstop4h 44m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 3/5

6:00 am-12:01 pm

Nonstop4h 01m

Chicago O'Hare Intl

Mon 3/9

7:00 am-9:51 am

Nonstop4h 51m

$177

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Sat 1/24

10:45 am-4:45 pm

Nonstop4h 00m

Chicago Midway

Tue 1/27

10:35 am-1:15 pm

Nonstop4h 40m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Mon 1/12

2:10 pm-8:17 pm

Nonstop4h 07m

Chicago O'Hare Intl

Mon 1/19

1:20 pm-4:01 pm

Nonstop4h 41m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

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

Have a flexible travel schedule? Discover the best time to fly to Illinois from Washington 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 Washington to Illinois

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

Currently, February is the cheapest month in which you can book a flight from State of Washington to Illinois (average of $116). Flying from State of Washington to Illinois in July is currently the most expensive (average of $169). 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 WA to IL?

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

When flying from State of Washington to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 24% versus a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Washington to Illinois. Price data was last updated on December 16, 2024.

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

Weekly flight availability from State of Washington to Illinois

Explore weekly flight availability from Washington to Illinois. 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 December 15, 2025.

The most flights from USWA to USIL are scheduled on a Monday (49 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated December 15, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Washington to Illinois by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,451 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,451 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Southwest
7.9
Good
4,250 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
8,007 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
9,092 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
American Airlines
7.2
Good
11,052 reviews
Alaska Airlines
8.0
Very good
11,451 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

Related info for your journey

Find useful and relevant information for your journey from Washington to Illinois. 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 State of Washington to Illinois?

    For as low as $177, Alaska Airlines can have you in Illinois from State of Washington in 4h. The distance between State of Washington and Illinois is about 1715 mi. All flights are typically nonstop.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington to Illinois 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 State of Washington to Illinois?

    Currently, February is the cheapest month in which you can book a flight from State of Washington to Illinois (average of $116). Flying from State of Washington to Illinois in July is currently the most expensive (average of $169). 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 Washington to Illinois

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

Discover the top 8 airlines that operate flights from Washington to Illinois. 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 December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$107Average$189FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$121Average$288FlexibilityNo cancel feeOn-time85%
DeltaCheapest$123Average$333FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$137Average$273FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$167Average$465FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$169Average$455FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$184Average$353FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$186Average$411FlexibilityNo cancel feeOn-time71%

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