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$85+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ORD
Apr 5 — Apr 121
Sat 4/5
Sat 4/12
1 adult, Economy
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Cheap flight deals from Washington to Illinois

Keep the following information in mind while searching for Washington to Illinois flight deals. Data was last updated March 31, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$169
(Hawaiian Airlines)

One-way from

$85
(Hawaiian Airlines)

Popular in

December

Cheapest in

January

Average price

$323

Good round-trip deal

$298 or less

Good one-way deal

$167 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Chicago (CHI) flights.
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From Washington to Illinois
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One-way flight from Washington to Illinois
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Highest demand for flights based on searches. 2% potential increase in price ($7 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 March 2025
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Price to beat on a round-trip flight from Washington to Illinois.
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Price to beat on a one-way flight from Washington to Illinois.
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Find 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 March 31, 2025.

This Hawaiian Airlines deal was found by Cheapflights users on 3/30. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/233:58 pmSEA - ORD
Nonstop4h 01mHawaiian Airlines
Tue 4/296:00 amORD - SEA
Nonstop4h 30mHawaiian Airlines
Deal found 3/30$169
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/267:10 amSEA - ORD
Nonstop4h 09mDelta
Sat 5/32:15 pmORD - SEA
Nonstop4h 42mDelta
Deal found 3/30$171
This Alaska Airlines deal was found by Cheapflights users on 3/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/2011:36 pmSEA - ORD
Nonstop4h 04mAlaska Airlines
Wed 4/2312:00 pmORD - SEA
Nonstop4h 33mAlaska Airlines
Deal found 3/31$174
This United Airlines deal was found by Cheapflights users on 3/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/37:00 amSEA - ORD
Nonstop4h 07mUnited Airlines
Tue 5/67:00 amORD - SEA
1 stop9h 00mUnited Airlines
Deal found 3/30$175
This Mytrip deal was found by Cheapflights users on 3/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/86:00 amSEA - ORD
1 stop21h 25mSpirit Airlines
Mon 5/129:02 pmORD - SEA
1 stop29h 08mSpirit Airlines
Deal found 3/30$177
This Travelocity deal was found by Cheapflights users on 3/31. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/3012:30 pmSEA - ORD
1 stop16h 03mMultiple Airlines
Fri 5/27:19 pmORD - SEA
Nonstop4h 41mMultiple Airlines
Deal found 3/31$192
This Southwest deal was found by Cheapflights users on 3/30. 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.
Wed 4/232:50 pmSEA - ORD
1 stop6h 15mSouthwest
Wed 4/302:50 pmORD - SEA
1 stop11h 00mSouthwest
Deal found 3/30$194
This Southwest deal was found by Cheapflights users on 3/30. 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.
Wed 4/232:50 pmSEA - MDW
1 stop6h 00mSouthwest
Tue 4/292:20 pmMDW - SEA
1 stop11h 30mSouthwest
Deal found 3/30$194
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/27:25 pmGEG - MDW
2 stops12h 15mDelta
Tue 5/63:02 pmMDW - GEG
2 stops10h 42mDelta
Deal found 3/30$216
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/27:25 pmGEG - ORD
2 stops10h 54mDelta
Tue 5/612:15 pmORD - GEG
2 stops10h 29mDelta
Deal found 3/30$216
This United Airlines deal was found by Cheapflights users on 3/31. 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.
Mon 5/56:00 amPDX - STL
1 stop9h 07mUnited Airlines
Tue 5/68:48 amSTL - PDX
1 stop6h 24mUnited Airlines
Deal found 3/31$227
This Delta deal was found by Cheapflights users on 3/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/119:55 amSEA - STL
1 stop6h 02mDelta
Tue 10/216:59 pmSTL - SEA
1 stop7h 10mDelta
Deal found 3/30$229

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 March 31, 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

Wed 4/23

3:58 pm-9:59 pm

Nonstop4h 01m

Chicago O'Hare Intl

Tue 4/29

6:00 am-8:30 am

Nonstop4h 30m

$169

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 4/26

7:10 am-1:19 pm

Nonstop4h 09m

Chicago O'Hare Intl

Sat 5/3

2:15 pm-4:57 pm

Nonstop4h 42m

$171

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sun 4/20

11:36 pm-5:40 am

Nonstop4h 04m

Chicago O'Hare Intl

Wed 4/23

12:00 pm-2:33 pm

Nonstop4h 33m

$174

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 5/3

7:00 am-1:07 pm

Nonstop4h 07m

Chicago O'Hare Intl

Tue 5/6

7:00 am-2:00 pm

1 stop9h 00m

$175

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 5/8

6:00 am-5:25 am

1 stop21h 25m

Chicago O'Hare Intl

Mon 5/12

9:02 pm-12:10 am

1 stop29h 08m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 4/30

12:30 pm-6:33 am

1 stop16h 03m

Chicago O'Hare Intl

Fri 5/2

7:19 pm-10:00 pm

Nonstop4h 41m

$192

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 4/23

2:50 pm-11:05 pm

1 stop6h 15m

Chicago O'Hare Intl

Wed 4/30

2:50 pm-11:50 pm

1 stop11h 00m

$194

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Wed 4/23

2:50 pm-10:50 pm

1 stop6h 00m

Chicago Midway

Tue 4/29

2:20 pm-11:50 pm

1 stop11h 30m

$194

SpokaneChicago

GEG - MDW

GEGMDW

Spokane

Fri 5/2

7:25 pm-9:40 am

2 stops12h 15m

Chicago Midway

Tue 5/6

3:02 pm-11:44 pm

2 stops10h 42m

$216

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Fri 5/2

7:25 pm-8:19 am

2 stops10h 54m

Chicago O'Hare Intl

Tue 5/6

12:15 pm-8:44 pm

2 stops10h 29m

$216

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

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, August is the cheapest month in which you can book a flight from State of Washington to Illinois (average of $245). Flying from State of Washington to Illinois in March is currently the most expensive (average of $323). 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 March 31, 2025.

When flying from State of Washington to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 March 31, 2025.

The most flights from USWA to USIL are scheduled on a Monday (49 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 March 31, 2025.
Read through reviews of airlines operating flights from Washington to Illinois, such as Alaska Airlines, Southwest and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,818 reviews

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,818 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,275 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,899 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,344 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,614 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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.

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

    One-way options have recently been found by users for as low as $85 on Hawaiian Airlines. Other airlines that offer cheap prices include Southwest from $85 and Spirit Airlines from $86 one-way.

  • 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, August is the cheapest month in which you can book a flight from State of Washington to Illinois (average of $245). Flying from State of Washington to Illinois in March is currently the most expensive (average of $323). 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 March 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$107Average$230FlexibilityNo cancel feeOn-time65%
DeltaCheapest$118Average$398FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$124Average$278FlexibilityNo cancel feeOn-time85%
FrontierCheapest$138Average$243FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$157Average$495FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$157Average$492FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$160Average$514FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$200Average$415FlexibilityNo cancel feeOn-time63%
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