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$63+ Cheap flights from Washington, D.C. (WAS) 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Aug 8 — Aug 151
Sat 8/8
Sat 8/15
1 adult, Economy
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Cheap flight deals from Washington, D.C. to Illinois

Cheapest flights from Washington, D.C. to Illinois
Explore the most affordable flight options available from Washington, D.C. to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 9, 2026.

This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Thu 8/68:35 am
BWI
-
STL
1 stop10h 02m
Frontier
Sun 8/96:34 pm
STL
-
BWI
1 stop11h 52m
Frontier
Deal found 7/8$122
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Fri 8/79:32 pm
BWI
-
STL
1 stop12h 25m
Frontier
Mon 8/104:57 pm
STL
-
BWI
1 stop5h 20m
Frontier
Deal found 7/8$123
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Sat 8/157:21 pm
BWI
-
STL
1 stop23h 16m
Frontier
Mon 8/174:57 pm
STL
-
BWI
1 stop5h 20m
Frontier
Deal found 7/8$124
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Thu 9/109:20 pm
BWI
-
STL
1 stop13h 20m
Frontier
Sun 9/1310:35 am
STL
-
BWI
1 stop20h 54m
Frontier
Deal found 7/8$125
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Fri 9/46:45 am
BWI
-
STL
1 stop11h 37m
Frontier
Sun 9/1310:35 am
STL
-
BWI
1 stop12h 36m
Frontier
Deal found 7/8$130
This Kiwi.com deal was found by Cheapflights users on 7/7. 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.
Fri 8/78:35 am
BWI
-
STL
1 stop25h 22m
Frontier
Fri 8/144:57 pm
STL
-
BWI
1 stop13h 29m
Frontier
Deal found 7/7$135
This Kiwi.com deal was found by Cheapflights users on 7/8. 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 9/239:20 pm
BWI
-
STL
1 stop13h 20m
Frontier
Fri 10/210:35 am
STL
-
BWI
1 stop7h 01m
Frontier
Deal found 7/8$137
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Fri 9/258:00 am
BWI
-
STL
1 stop26h 40m
Frontier
Thu 10/110:35 am
STL
-
BWI
1 stop20h 54m
Frontier
Deal found 7/8$138
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Fri 8/218:45 am
BWI
-
STL
1 stop9h 37m
Frontier
Sun 8/236:17 pm
STL
-
BWI
1 stop12h 09m
Frontier
Deal found 7/8$139
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Mon 8/39:32 pm
BWI
-
STL
1 stop21h 05m
Frontier
Sat 8/84:57 pm
STL
-
BWI
1 stop13h 29m
Frontier
Deal found 7/8$141
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Fri 7/319:37 pm
BWI
-
STL
1 stop12h 20m
Frontier
Sun 8/96:34 pm
STL
-
BWI
1 stop11h 52m
Frontier
Deal found 7/8$142
This Kiwi.com deal was found by Cheapflights users on 7/9. 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.
Thu 8/139:32 pm
BWI
-
STL
1 stop12h 25m
Frontier
Sun 8/166:34 pm
STL
-
BWI
1 stop11h 52m
Frontier
Deal found 7/9$146

Find flight deals from Washington, D.C. to Illinois

Keep the following information in mind while searching for Washington, D.C. to Illinois flight deals. Data was last updated July 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$122
(Kiwi.com)

One-way from

$63
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$315

Good round-trip deal

$296 or less

Good one-way deal

$179 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Chicago (CHI) flights.
Search Deals
From Washington, D.C. (WAS) to Illinois
Search Deals
One-way flight from Washington, D.C. (WAS) to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($54 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 July 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. (WAS) to Illinois.
Search Deals
Price to beat on a one-way flight from Washington, D.C. (WAS) to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. 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 July 9, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Sat 8/8

6:35 am-7:35 am

Nonstop2h 00m

Chicago Midway

Mon 8/10

7:55 pm-10:45 pm

Nonstop1h 50m

$240

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Fri 8/14

4:55 pm-7:50 pm

1 stop3h 55m

Chicago Midway

Mon 8/17

8:00 am-1:30 pm

1 stop4h 30m

$241

Washington, D.C.Chicago

DCA - MDW

DCAMDW

Washington, D.C. Reagan-National

Thu 9/3

9:15 pm-10:10 pm

Nonstop1h 55m

Chicago Midway

Sat 9/5

5:10 pm-8:05 pm

Nonstop1h 55m

$241

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Thu 9/3

6:30 am-7:30 am

Nonstop2h 00m

Chicago Midway

Sun 9/6

1:45 pm-6:15 pm

1 stop3h 30m

$245

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 9/3

10:16 am-2:09 pm

1 stop4h 53m

Chicago O'Hare Intl

Sat 9/5

6:59 am-11:48 am

1 stop3h 49m

$261

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 9/16

6:01 am-7:30 am

Nonstop2h 29m

Chicago O'Hare Intl

Sun 9/20

6:58 am-10:07 am

Nonstop2h 09m

$264

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Fri 8/14

12:30 pm-4:15 pm

1 stop4h 45m

Chicago Midway

Mon 8/17

6:42 pm-11:26 pm

1 stop3h 44m

$265

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Fri 8/14

7:45 pm-11:57 pm

1 stop5h 12m

Chicago O'Hare Intl

Thu 8/20

1:50 pm-8:33 pm

1 stop5h 43m

$267

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Sat 8/8

8:30 am-2:10 pm

2 stops6h 40m

Chicago Midway

Sat 8/15

9:20 am-4:35 pm

1 stop6h 15m

$269

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 9/3

6:15 am-7:30 am

Nonstop2h 15m

Chicago O'Hare Intl

Sun 9/6

12:55 pm-4:01 pm

Nonstop2h 06m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/7

Showing 1-10 of 60 resultsSorted by cheapest first
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6

Best time to book a flight from Washington, D.C. to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Washington, D.C. 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, D.C. to Illinois

What is the cheapest month to book a flight from Washington, D.C. to Illinois?

Currently, September is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $225). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $416). 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 WAS to IL?

Find hourly flight availability from Washington, D.C. 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 July 9, 2026.

One of the essential ways to save on airfare from Washington, D.C. to Illinois is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 12% on airfare.

Weekly flight availability from Washington, D.C. to Illinois

Explore weekly flight availability from Washington, D.C. 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 July 9, 2026.

The most flights from WAS to USIL are scheduled on a Thursday (96 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (47 on average).

How much does it cost to fly round-trip from Washington, D.C. to Illinois?

How far ahead should I book a flight from Washington, D.C. to Illinois?

The best time to book flights from Washington, D.C. to Illinois is 54 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from Washington, D.C. to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Illinois. Price data was last updated on July 4, 2026.

Travelers seeking maximum savings on their Washington, D.C. to Illinois flight should consider departing on Friday at noon 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.

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 July 9, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited Airlines from Washington, D.C. to Illinois to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,248 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

7.9

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Reza,Jun 2026

TPA - MDW

The seats were super cramped and couldn’t move without hitting other passengers
Southwest
7.9
Good
4,248 reviews
Southwest
7.9
Good
4,248 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

7.9

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Reza,Jun 2026

TPA - MDW

The seats were super cramped and couldn’t move without hitting other passengers
Delta
7.8
Good
8,453 reviews
Southwest
7.9
Good
4,248 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

7.9

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Reza,Jun 2026

TPA - MDW

The seats were super cramped and couldn’t move without hitting other passengers
United Airlines
7.4
Good
9,955 reviews
Southwest
7.9
Good
4,248 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

7.9

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Reza,Jun 2026

TPA - MDW

The seats were super cramped and couldn’t move without hitting other passengers
American Airlines
7.1
Good
11,790 reviews
Southwest
7.9
Good
4,248 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

7.9

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Reza,Jun 2026

TPA - MDW

The seats were super cramped and couldn’t move without hitting other passengers
Frontier
5.6
Fair
2,835 reviews
Southwest
7.9
Good
4,248 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

7.9

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Reza,Jun 2026

TPA - MDW

The seats were super cramped and couldn’t move without hitting other passengers

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. 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 Washington, D.C. to Illinois?

    A quick flight from Washington, D.C. to Illinois can take about 2h. Southwest provides one of the quickest options available for as low as $240. The distance from Washington, D.C. to Illinois is about 609 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Washington, D.C. to Illinois one-way?

    $26 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on American Airlines and Southwest, with prices starting from $78 and $85, respectively.

  • What are the most popular routes from Washington, D.C. to Illinois?

    While some choose either Washington, D.C. Reagan-National - Chicago O'Hare Intl or Washington, D.C. Dulles Intl - Chicago O'Hare Intl, Baltimore/Washington - Chicago O'Hare Intl is the most popular route from Washington, D.C. to Illinois.

  • What are the most reliable airlines from Washington, D.C. to Illinois?

    The top 3 most reliable airlines when flying from Washington, D.C. to Illinois are Egyptair (92%), Air China (91%) and ANA (80%).

  • What are the cheapest flights from Washington, D.C. to Illinois?

    On average you can expect to pay $835 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $140 while the most popular route, (Baltimore/Washington - Chicago O'Hare Intl) is currently priced at $98.

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

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

  • How can I find direct flights from Washington, D.C. to Illinois?

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

  • Can I find deals for business class flights from Washington, D.C. to Illinois?

    Yes. Cheapflights offers flight deals from Washington, D.C. 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 Washington, D.C. to Illinois?

    Currently, September is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $225). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $416). 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.

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Alternative routes for Washington, D.C. to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Washington, D.C. to Illinois

Discover the top 5 airlines that operate flights from Washington, D.C. 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 July 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$29Average$173FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$117Average$309FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$131Average$379FlexibilityNo cancel feeOn-time69%
DeltaCheapest$149Average$342FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$154Average$376FlexibilityNo cancel feeOn-time71%

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