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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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$165
(Alaska Airlines)

One-way from

$87
(SmartFares)

Popular in

December

Cheapest in

January

Average price

$352

Good round-trip deal

$278 or less

Good one-way deal

$152 or less
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. 4% potential increase in price ($13 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 June 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 June 12, 2025.

This Alaska Airlines deal was found by Cheapflights users on 6/12. 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.
Mon 8/116:00 amSEA - ORD
Nonstop4h 07mAlaska Airlines
Mon 8/186:00 amORD - SEA
Nonstop4h 37mAlaska Airlines
Deal found 6/12$165
This Southwest deal was found by Cheapflights users on 6/11. 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.
Fri 9/195:00 amSEA - ORD
1 stop9h 45mSouthwest
Mon 9/222:55 pmORD - SEA
1 stop8h 50mSouthwest
Deal found 6/11$166
This Southwest deal was found by Cheapflights users on 6/11. 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.
Fri 11/145:35 amSEA - MDW
2 stops10h 55mSouthwest
Mon 11/178:45 amMDW - SEA
1 stop9h 45mSouthwest
Deal found 6/11$166
This American Airlines deal was found by Cheapflights users on 6/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1912:45 amSEA - ORD
Nonstop4h 06mAmerican Airlines
Wed 8/276:50 amORD - SEA
Nonstop4h 29mAmerican Airlines
Deal found 6/12$170
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Thu 10/307:28 pmSEA - ORD
1 stop8h 12mUnited Airlines
Mon 11/34:15 pmORD - SEA
Nonstop4h 42mUnited Airlines
Deal found 6/11$175
This Hawaiian Airlines deal was found by Cheapflights users on 6/10. 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.
Fri 8/154:25 pmSEA - ORD
Nonstop4h 05mHawaiian Airlines
Sun 8/178:42 pmORD - SEA
Nonstop4h 42mHawaiian Airlines
Deal found 6/10$177
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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.
Fri 8/15:30 pmSEA - ORD
1 stop10h 33mSpirit Airlines
Tue 8/57:08 amORD - SEA
1 stop11h 17mSpirit Airlines
Deal found 6/11$195
This Delta deal was found by Cheapflights users on 6/11. 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.
Tue 7/223:38 pmGEG - ORD
1 stop6h 18mDelta
Tue 8/127:15 amORD - GEG
1 stop9h 30mDelta
Deal found 6/11$198
This Delta deal was found by Cheapflights users on 6/10. 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 7/1111:09 pmGEG - MDW
1 stop8h 36mDelta
Mon 7/149:24 amMDW - GEG
1 stop5h 53mDelta
Deal found 6/10$205
This Delta deal was found by Cheapflights users on 6/11. 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 11/225:45 pmSEA - ORD
Nonstop4h 02mDelta
Sat 12/67:30 amORD - SEA
Nonstop4h 47mDelta
Deal found 6/11$209
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/256:39 pmPDX - ORD
1 stop14h 11mSpirit Airlines
Sun 6/2910:15 pmORD - PDX
1 stop15h 02mSpirit Airlines
Deal found 6/12$210
This Southwest deal was found by Cheapflights users on 6/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1011:45 amPDX - MDW
1 stop8h 05mSouthwest
Sun 9/1410:25 pmMDW - PDX
Nonstop4h 15mSouthwest
Deal found 6/12$211

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 June 12, 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

Mon 8/11

6:00 am-12:07 pm

Nonstop4h 07m

Chicago O'Hare Intl

Mon 8/18

6:00 am-8:37 am

Nonstop4h 37m

$165

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 9/19

5:00 am-4:45 pm

1 stop9h 45m

Chicago O'Hare Intl

Mon 9/22

2:55 pm-9:45 pm

1 stop8h 50m

$166

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Fri 11/14

5:35 am-6:30 pm

2 stops10h 55m

Chicago Midway

Mon 11/17

8:45 am-4:30 pm

1 stop9h 45m

$166

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 8/19

12:45 am-6:51 am

Nonstop4h 06m

Chicago O'Hare Intl

Wed 8/27

6:50 am-9:19 am

Nonstop4h 29m

$170

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 10/30

7:28 pm-5:40 am

1 stop8h 12m

Chicago O'Hare Intl

Mon 11/3

4:15 pm-6:57 pm

Nonstop4h 42m

$175

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 8/15

4:25 pm-10:30 pm

Nonstop4h 05m

Chicago O'Hare Intl

Sun 8/17

8:42 pm-11:24 pm

Nonstop4h 42m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 8/1

5:30 pm-6:03 am

1 stop10h 33m

Chicago O'Hare Intl

Tue 8/5

7:08 am-4:25 pm

1 stop11h 17m

$195

SpokaneChicago

GEG - ORD

GEGORD

Spokane

Tue 7/22

3:38 pm-11:56 pm

1 stop6h 18m

Chicago O'Hare Intl

Tue 8/12

7:15 am-2:45 pm

1 stop9h 30m

$198

SpokaneChicago

GEG - MDW

GEGMDW

Spokane

Fri 7/11

11:09 pm-9:45 am

1 stop8h 36m

Chicago Midway

Mon 7/14

9:24 am-1:17 pm

1 stop5h 53m

$205

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 11/22

5:45 pm-11:47 pm

Nonstop4h 02m

Chicago O'Hare Intl

Sat 12/6

7:30 am-10:17 am

Nonstop4h 47m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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 June 12, 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 June 12, 2025.

The most flights from USWA to USIL are scheduled on a Thursday (77 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (33 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 June 12, 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
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

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
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

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
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

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
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

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 $87 on Alaska Airlines. Other airlines that offer cheap prices include Southwest from $88 and Delta from $90 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$107Average$230FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$119Average$288FlexibilityNo cancel feeOn-time85%
DeltaCheapest$129Average$385FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$137Average$272FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$157Average$468FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$168Average$497FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$169Average$481FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$188Average$392FlexibilityNo cancel feeOn-time63%

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