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Illinois

$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 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ORD
May 4 — May 111
Sun 5/4
Sun 5/11
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 April 29, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$179
(Hawaiian Airlines)

One-way from

$85
(Delta)

Popular in

December

Cheapest in

January

Average price

$284

Good round-trip deal

$288 or less

Good one-way deal

$163 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. 3% potential increase in price ($10 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 April 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 April 29, 2025.

This Hawaiian Airlines deal was found by Cheapflights users on 4/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/711:48 amSEA - ORD
Nonstop4h 13mHawaiian Airlines
Sun 5/116:00 amORD - SEA
Nonstop4h 30mHawaiian Airlines
Deal found 4/28$179
This Southwest deal was found by Cheapflights users on 4/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/1610:40 pmSEA - MDW
1 stop9h 05mSouthwest
Wed 8/138:55 pmMDW - SEA
Nonstop4h 30mSouthwest
Deal found 4/28$179
This Cheapflightsfares deal was found by Cheapflights users on 4/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/283:20 pmSEA - ORD
1 stop12h 05mSpirit Airlines
Wed 6/411:50 amORD - SEA
1 stop14h 20mSpirit Airlines
Deal found 4/28$184
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Tue 5/610:55 amSEA - ORD
Nonstop4h 09mUnited Airlines
Sat 5/107:00 amORD - SEA
1 stop9h 00mUnited Airlines
Deal found 4/28$185
This Orbitz deal was found by Cheapflights users on 4/29. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/135:58 pmSEA - ORD
Nonstop4h 01mMultiple Airlines
Fri 5/1611:50 amORD - SEA
1 stop14h 20mMultiple Airlines
Deal found 4/29$188
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/68:00 pmSEA - ORD
1 stop15h 07mAlaska Airlines
Tue 5/139:00 amORD - SEA
Nonstop4h 32mAlaska Airlines
Deal found 4/29$189
This Frontier deal was found by Cheapflights users on 4/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/246:25 amSEA - MDW
1 stop12h 28mFrontier
Sat 5/312:44 pmMDW - SEA
1 stop11h 53mFrontier
Deal found 4/29$198
This Delta deal was found by Cheapflights users on 4/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/75:50 pmSEA - ORD
Nonstop4h 09mDelta
Sun 6/157:09 amORD - SEA
Nonstop4h 36mDelta
Deal found 4/29$199
This American Airlines deal was found by Cheapflights users on 4/29. 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.
Mon 8/2512:34 amSEA - ORD
Nonstop4h 06mAmerican Airlines
Sat 8/3010:05 amORD - SEA
Nonstop4h 37mAmerican Airlines
Deal found 4/29$200
This Southwest deal was found by Cheapflights users on 4/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/87:30 amGEG - MDW
1 stop11h 30mSouthwest
Wed 9/108:25 amMDW - GEG
1 stop8h 45mSouthwest
Deal found 4/28$202
This Delta deal was found by Cheapflights users on 4/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/85:05 amGEG - ORD
1 stop6h 18mDelta
Tue 6/103:52 pmORD - GEG
2 stops9h 50mDelta
Deal found 4/28$202
This Delta deal was found by Cheapflights users on 4/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/137:30 pmGEG - MDW
2 stops11h 14mDelta
Sun 6/159:21 amMDW - GEG
1 stop5h 56mDelta
Deal found 4/29$204

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 April 29, 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 5/7

11:48 am-6:01 pm

Nonstop4h 13m

Chicago O'Hare Intl

Sun 5/11

6:00 am-8:30 am

Nonstop4h 30m

$179

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Wed 7/16

10:40 pm-9:45 am

1 stop9h 05m

Chicago Midway

Wed 8/13

8:55 pm-11:25 pm

Nonstop4h 30m

$179

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 5/28

3:20 pm-5:25 am

1 stop12h 05m

Chicago O'Hare Intl

Wed 6/4

11:50 am-12:10 am

1 stop14h 20m

$184

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 5/6

10:55 am-5:04 pm

Nonstop4h 09m

Chicago O'Hare Intl

Sat 5/10

7:00 am-2:00 pm

1 stop9h 00m

$185

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 5/13

5:58 pm-11:59 pm

Nonstop4h 01m

Chicago O'Hare Intl

Fri 5/16

11:50 am-12:10 am

1 stop14h 20m

$188

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 5/6

8:00 pm-1:07 pm

1 stop15h 07m

Chicago O'Hare Intl

Tue 5/13

9:00 am-11:32 am

Nonstop4h 32m

$189

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Sat 5/24

6:25 am-8:53 pm

1 stop12h 28m

Chicago Midway

Sat 5/31

2:44 pm-12:37 am

1 stop11h 53m

$198

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 6/7

5:50 pm-11:59 pm

Nonstop4h 09m

Chicago O'Hare Intl

Sun 6/15

7:09 am-9:45 am

Nonstop4h 36m

$199

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 6/6

12:05 am-6:05 am

Nonstop4h 00m

Chicago O'Hare Intl

Tue 6/10

7:25 am-10:04 am

Nonstop4h 39m

$200

SpokaneChicago

GEG - MDW

GEGMDW

Spokane

Mon 9/8

7:30 am-9:00 pm

1 stop11h 30m

Chicago Midway

Wed 9/10

8:25 am-3:10 pm

1 stop8h 45m

$202

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

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 $321). 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 April 29, 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 April 29, 2025.

The most flights from USWA to USIL are scheduled on a Tuesday (62 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 April 29, 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
9,961 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,295 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,402 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Comfort

7.9

Boarding

8.2

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 Delta. Other airlines that offer cheap prices include Southwest from $85 and Spirit Airlines from $87 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 $321). 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 April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$107Average$213FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$114Average$285FlexibilityNo cancel feeOn-time85%
DeltaCheapest$129Average$400FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$131Average$268FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$158Average$484FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$160Average$489FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$166Average$524FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$194Average$393FlexibilityNo cancel feeOn-time63%

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