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$62+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ORD
feb. 25 — mar. 41
mar. 2/25
mar. 3/4
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 febrero 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$160
(CheapOair)

One-way from

$62
(Mytrip)

Popular in

December

Cheapest in

January

Average price

$269

Good round-trip deal

$323 or less

Good one-way deal

$185 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 ($9 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 February 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 febrero 20, 2025.

This Mytrip deal was found by Cheapflights users on 2/19. 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.
mar. 3/1810:06 amPDX - STL
1 stop21h 10mFrontier
jue. 3/206:38 pmSTL - PDX
1 stop16h 02mFrontier
Deal found 2/19$160
This Mytrip deal was found by Cheapflights users on 2/19. 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.
mié. 3/198:04 pmSEA - ORD
1 stop7h 42mSpirit Airlines
mié. 3/2612:14 pmORD - SEA
2 stops22h 29mSpirit Airlines
Deal found 2/19$172
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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.
mié. 4/211:36 pmSEA - ORD
Nonstop4h 04mAlaska Airlines
lun. 4/77:16 pmORD - SEA
Nonstop4h 44mAlaska Airlines
Deal found 2/20$173
This FlightHub deal was found by Cheapflights users on 2/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 3/15:38 pmSEA - ORD
1 stop9h 50mMultiple Airlines
lun. 3/107:59 pmORD - SEA
1 stop15h 31mMultiple Airlines
Deal found 2/20$174
This United Airlines deal was found by Cheapflights users on 2/19. 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.
mié. 5/75:18 pmSEA - ORD
Nonstop4h 05mUnited Airlines
sáb. 5/107:00 amORD - SEA
1 stop9h 00mUnited Airlines
Deal found 2/19$176
This Delta deal was found by Cheapflights users on 2/20. 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.
lun. 4/1412:40 amSEA - ORD
1 stop5h 55mDelta
mar. 4/221:45 pmORD - SEA
1 stop6h 54mDelta
Deal found 2/20$177
This Delta deal was found by Cheapflights users on 2/19. 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.
vie. 3/2110:00 pmSEA - MDW
1 stop8h 45mDelta
vie. 3/287:09 pmMDW - SEA
1 stop6h 23mDelta
Deal found 2/19$177
This CheapOair deal was found by Cheapflights users on 2/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 3/72:02 pmSEA - ORD
1 stop21h 18mFrontier
lun. 3/107:59 pmORD - SEA
1 stop15h 31mFrontier
Deal found 2/20$180
This CheapOair deal was found by Cheapflights users on 2/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 3/1311:38 amSEA - MDW
1 stop15h 53mFrontier
dom. 3/168:44 pmMDW - SEA
1 stop16h 08mFrontier
Deal found 2/19$180
This Hawaiian Airlines deal was found by Cheapflights users on 2/20. 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.
mar. 8/266:00 amSEA - ORD
Nonstop4h 04mHawaiian Airlines
sáb. 8/302:00 pmORD - SEA
Nonstop4h 48mHawaiian Airlines
Deal found 2/20$189
This Southwest deal was found by Cheapflights users on 2/18. 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.
mar. 3/119:10 amSEA - MDW
Nonstop3h 55mSouthwest
jue. 3/134:55 pmMDW - SEA
Nonstop4h 35mSouthwest
Deal found 2/18$199
This American Airlines deal was found by Cheapflights users on 2/19. 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.
lun. 3/3111:59 pmSEA - ORD
1 stop7h 29mAmerican Airlines
mar. 4/18:25 pmORD - SEA
Nonstop4h 42mAmerican Airlines
Deal found 2/19$203

Find flights from Washington to Illinois within your budget

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 febrero 20, 2025.

Fly from

Washington

Fly to

Illinois

Route

Depart

Return

Price

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

mar. 3/18

10:06 am-9:16 am

1 stop21h 10m

Lambert-St Louis

jue. 3/20

6:38 pm-8:40 am

1 stop16h 02m

$160

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

mié. 3/19

8:04 pm-5:46 am

1 stop7h 42m

Chicago O'Hare Intl

mié. 3/26

12:14 pm-8:43 am

2 stops22h 29m

$172

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

mié. 4/2

11:36 pm-5:40 am

Nonstop4h 04m

Chicago O'Hare Intl

mar. 4/8

5:53 pm-8:34 pm

Nonstop4h 41m

$173

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

mié. 5/7

5:18 pm-11:23 pm

Nonstop4h 05m

Chicago O'Hare Intl

sáb. 5/10

7:00 am-2:00 pm

1 stop9h 00m

$176

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

lun. 4/14

12:40 am-8:35 am

1 stop5h 55m

Chicago O'Hare Intl

mar. 4/22

1:45 pm-6:39 pm

1 stop6h 54m

$177

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

vie. 3/21

10:00 pm-8:45 am

1 stop8h 45m

Chicago Midway

vie. 3/28

7:09 pm-11:32 pm

1 stop6h 23m

$177

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

mié. 4/9

12:30 pm-6:33 am

1 stop16h 03m

Chicago O'Hare Intl

lun. 4/14

8:01 pm-9:35 am

1 stop15h 34m

$179

SeattleChicago

SEA - ORD

SEAORD

Seattle/Tacoma Intl

vie. 3/7

2:02 pm-1:20 pm

1 stop21h 18m

Chicago O'Hare Intl

lun. 3/10

7:59 pm-9:30 am

1 stop15h 31m

$180

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

jue. 3/13

11:38 am-5:31 am

1 stop15h 53m

Chicago Midway

dom. 3/16

8:44 pm-10:52 am

1 stop16h 08m

$180

SeattleChicago

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

mar. 3/11

9:10 am-3:05 pm

Nonstop3h 55m

Chicago Midway

jue. 3/13

4:55 pm-7:30 pm

Nonstop4h 35m

$199

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

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.

Travel insights for flights from Washington to Illinois

Get recent, data-driven insights about flights from Washington to Illinois including ideal travel times, pricing trends, and more.

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 febrero 20, 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 febrero 20, 2025.

The most flights from USWA to USIL are scheduled on a Thursday (39 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 febrero 20, 2025.
Read through reviews of airlines operating flights from Washington to Illinois, such as Southwest, Alaska Airlines and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,697 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,219 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Hawaiian Airlines
7.9
Good
2,317 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,765 reviews
Southwest
8.1
Very good
4,411 reviews

Boarding

8.2

Entertainment

7.6

Comfort

8.1

Crew

8.7

Food

7.1

Overall

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 $62 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $82 and Delta from $85 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 7 airlines flying from Washington to Illinois

Discover the top 7 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 febrero 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$107Average$235FlexibilityNo cancel feeOn-time65%
DeltaCheapest$108Average$402FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$135Average$246FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$146Average$513FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$147Average$507FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$157Average$501FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$188Average$446FlexibilityNo cancel feeOn-time63%
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