HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$55+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington, D.C. to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap 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 November 3, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$119
(Frontier)

One-way from

$55
(Priceline)

Popular in

April

Cheapest in

September

Average price

$264

Good round-trip deal

$151 or less

Good one-way deal

$93 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. 7% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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

Find 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 November 3, 2025.

This Frontier deal was found by Cheapflights users on 10/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/147:25 pmBWI - MDW
Nonstop2h 06mFrontier
Mon 11/171:37 pmMDW - BWI
1 stop9h 36mFrontier
Deal found 10/31$119
This CheapOair deal was found by Cheapflights users on 11/1. 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.
Fri 11/144:02 pmBWI - ORD
Nonstop2h 16mFrontier
Mon 11/1711:24 amORD - BWI
1 stop11h 49mFrontier
Deal found 11/1$119
This Trip.com deal was found by Cheapflights users on 11/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/154:30 pmBWI - ORD
1 stop7h 59mFrontier
Mon 11/1711:24 amORD - BWI
1 stop11h 49mFrontier
Deal found 11/2$120
This Trip.com deal was found by Cheapflights users on 11/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/154:30 pmBWI - MDW
1 stop6h 05mFrontier
Mon 11/171:37 pmMDW - BWI
1 stop9h 36mFrontier
Deal found 11/2$121
This Frontier deal was found by Cheapflights users on 11/2. 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.
Tue 12/239:37 amBWI - ORD
Nonstop2h 18mFrontier
Tue 12/305:35 amORD - BWI
Nonstop2h 07mFrontier
Deal found 11/2$122
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 12/16:29 pmBWI - ORD
1 stop25h 17mMultiple Airlines
Sun 12/75:11 amORD - BWI
Nonstop2h 07mMultiple Airlines
Deal found 11/2$123
This CheapOair deal was found by Cheapflights users on 11/2. 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.
Thu 12/411:48 amBWI - MDW
1 stop11h 24mFrontier
Fri 12/53:52 pmMDW - BWI
1 stop14h 50mFrontier
Deal found 11/2$124
This Priceline deal was found by Cheapflights users on 11/3. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/38:00 amBWI - ORD
1 stop7h 31mFrontier
Sun 12/79:47 amORD - BWI
1 stop9h 05mFrontier
Deal found 11/3$124
This Kiwi.com deal was found by Cheapflights users on 11/3. 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 11/175:50 amBWI - ORD
1 stop5h 51mFrontier
Mon 11/2412:29 pmORD - BWI
1 stop6h 21mFrontier
Deal found 11/3$126
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 11/206:38 pmBWI - ORD
1 stop6h 30mFrontier
Mon 11/2412:29 pmORD - BWI
1 stop6h 21mFrontier
Deal found 11/2$127
This Frontier deal was found by Cheapflights users on 10/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/144:30 pmBWI - MDW
1 stop6h 38mFrontier
Sat 11/151:37 pmMDW - BWI
1 stop9h 25mFrontier
Deal found 10/31$128
This CheapOair deal was found by Cheapflights users on 11/3. 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.
Thu 12/115:55 amBWI - ORD
1 stop12h 32mFrontier
Sat 12/131:24 pmORD - BWI
1 stop10h 00mFrontier
Deal found 11/3$128

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 November 3, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Illinois that are best for you.

Fly from

Washington, D.C.

Fly to

Illinois

Route

Depart

Return

Price

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Sat 2/14

5:40 pm-6:50 pm

Nonstop2h 10m

Chicago Midway

Sat 2/21

6:15 pm-9:05 pm

Nonstop1h 50m

$139

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Fri 12/5

5:19 pm-10:12 pm

1 stop5h 53m

Chicago Midway

Sun 12/7

6:15 am-4:24 pm

1 stop9h 09m

$142

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Fri 1/16

5:18 pm-6:38 pm

Nonstop2h 20m

Chicago O'Hare Intl

Mon 1/19

11:05 am-2:11 pm

Nonstop2h 06m

$148

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Tue 1/20

7:45 am-9:05 am

Nonstop2h 20m

Chicago Midway

Fri 1/23

5:15 pm-8:10 pm

Nonstop1h 55m

$148

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sat 2/14

5:14 pm-6:37 pm

Nonstop2h 23m

Chicago O'Hare Intl

Sat 2/21

6:25 pm-9:27 pm

Nonstop2h 02m

$148

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Fri 1/23

10:05 am-11:25 am

Nonstop2h 20m

Chicago O'Hare Intl

Wed 1/28

6:35 pm-9:41 pm

Nonstop2h 06m

$148

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Tue 1/20

10:05 am-11:25 am

Nonstop2h 20m

Chicago O'Hare Intl

Fri 1/23

6:35 pm-9:41 pm

Nonstop2h 06m

$148

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Fri 1/9

1:45 pm-2:55 pm

Nonstop2h 10m

Chicago Midway

Sun 1/11

7:05 pm-9:55 pm

Nonstop1h 50m

$157

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Fri 1/16

5:18 pm-6:38 pm

Nonstop2h 20m

Chicago O'Hare Intl

Fri 1/23

11:05 am-2:11 pm

Nonstop2h 06m

$157

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sat 1/17

6:15 am-12:15 pm

1 stop7h 00m

Chicago O'Hare Intl

Tue 1/20

11:55 am-8:35 pm

1 stop7h 40m

$159

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 60 results
1
2
3
...
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, March is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $50). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $132). 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 November 3, 2025.

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 at noon tend to be the most expensive. A flight in the evening could potentially save you up to 36% on airfare.

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 November 3, 2024.

Travelers seeking maximum savings on their Washington, D.C. to Illinois flight should consider departing on Saturday evenings 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.

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 November 3, 2025.

The most flights from WAS to USIL are scheduled on a Monday (69 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (25 on average).

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 November 3, 2025.
Peruse reviews from past customers who have flown with Southwest, United Airlines, and American 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
8.0
Very good
4,238 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,997 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,038 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Spirit Airlines
6.3
Okay
8,115 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,117 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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 10m. Southwest provides one of the quickest options available for as low as $139. 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?

    $61 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Spirit Airlines and Southwest, with prices starting from $67 and $70, respectively.

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

    While some choose either Baltimore/Washington - Chicago O'Hare Intl or Washington, D.C. Reagan-National - Chicago O'Hare Intl, Washington, D.C. Dulles Intl - 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 Air China (94%), Egyptair (93%) and Ethiopian Air (80%).

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

    On average you can expect to pay $940 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $118 while the most popular route, (Washington, D.C. Dulles Intl - Chicago O'Hare Intl) is currently priced at $150.

  • 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, March is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $50). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $132). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Washington, D.C. to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Miami flights
Dulles Intl to Dallas/Fort Worth flights
Dulles Intl to Las Vegas flights
Reagan-National to Miami flights
Dulles Intl to Atlanta flights
Reagan-National to Dallas/Fort Worth flights
Reagan-National to Orlando flights
Reagan-National to Los Angeles flights
Dulles Intl to Los Angeles flights
Dulles Intl to Orlando flights
Reagan-National to Las Vegas flights
Dulles Intl to Hobby flights
Dulles Intl to O'Hare Intl flights
Reagan-National to Hobby flights
Dulles Intl to Fort Lauderdale flights
Reagan-National to O'Hare Intl flights
Dulles Intl to John F Kennedy Intl flights
Dulles Intl to Sky Harbor Intl flights
Reagan-National to San Francisco flights
Dulles Intl to Seattle flights
Reagan-National to Fort Lauderdale flights
Dulles Intl to George Bush Intcntl flights
Dulles Intl to Tampa flights
Reagan-National to Seattle flights
Reagan-National to Atlanta flights
Dulles Intl to San Francisco flights
Dulles Intl to New Orleans flights
Dulles Intl to Denver flights
Reagan-National to George Bush Intcntl flights
Reagan-National to Tampa flights
Reagan-National to Boston flights
Dulles Intl to Boston flights
Reagan-National to Sky Harbor Intl flights
Reagan-National to Nashville flights
Dulles Intl to San Diego flights
Dulles Intl to Nashville flights
Dulles Intl to Austin flights
Dulles Intl to Midway flights
Dulles Intl to LaGuardia flights
Dulles Intl to Newark flights
Reagan-National to New Orleans flights
Dulles Intl to Honolulu flights
Dulles Intl to Minneapolis flights
Reagan-National to LaGuardia flights
Reagan-National to West Palm Beach flights
Dulles Intl to Salt Lake City flights
Dulles Intl to Detroit flights
Reagan-National to Minneapolis flights
Reagan-National to San Diego flights
Reagan-National to John F Kennedy Intl flights

Top 6 airlines flying from Washington, D.C. to Illinois

Discover the top 6 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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$52Average$124FlexibilityNo cancel feeOn-time65%
FrontierCheapest$68Average$182FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$366FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$154Average$408FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$157Average$298FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$158Average$368FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.