HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$54+ 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
Nov 11 — Nov 181
Tue 11/11
Tue 11/18
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 October 12, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$108
(Gotogate)

One-way from

$54
(Frontier)

Popular in

April

Cheapest in

September

Average price

$248

Good round-trip deal

$149 or less

Good one-way deal

$84 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. 8% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 12, 2025.

This Gotogate deal was found by Cheapflights users on 10/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/134:15 pmBWI - MDW
1 stop6h 48mFrontier
Mon 11/171:37 pmMDW - BWI
1 stop9h 36mFrontier
Deal found 10/10$108
This Mytrip deal was found by Cheapflights users on 10/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/134:15 pmBWI - ORD
1 stop8h 56mFrontier
Mon 11/175:15 amORD - BWI
1 stop28h 05mFrontier
Deal found 10/11$108
This Frontier deal was found by Cheapflights users on 10/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/303:09 pmBWI - ORD
Nonstop2h 16mFrontier
Mon 11/312:11 pmORD - BWI
Nonstop2h 03mFrontier
Deal found 10/12$109
This Booking.com deal was found by Cheapflights users on 10/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/303:09 pmBWI - ORD
Nonstop2h 16mFrontier
Thu 11/612:00 pmORD - BWI
Nonstop2h 03mFrontier
Deal found 10/10$110
This Trip.com deal was found by Cheapflights users on 10/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/254:37 pmBWI - MDW
1 stop7h 10mFrontier
Fri 11/73:47 pmMDW - BWI
Nonstop1h 55mFrontier
Deal found 10/11$111
This Flightnetwork deal was found by Cheapflights users on 10/9. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/89:12 amBWI - ORD
Nonstop2h 24mMultiple Airlines
Thu 12/117:56 pmORD - BWI
Nonstop1h 58mMultiple Airlines
Deal found 10/9$111
This Frontier deal was found by Cheapflights users on 10/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/247:54 pmBWI - MDW
Nonstop2h 06mFrontier
Mon 10/274:12 pmMDW - BWI
Nonstop1h 56mFrontier
Deal found 10/11$113
This Frontier deal was found by Cheapflights users on 10/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/244:46 pmBWI - ORD
Nonstop2h 29mFrontier
Thu 11/612:00 pmORD - BWI
Nonstop2h 03mFrontier
Deal found 10/11$113
This Mytrip deal was found by Cheapflights users on 10/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/147:25 pmBWI - MDW
Nonstop2h 06mFrontier
Sun 11/1610:12 amMDW - BWI
1 stop21h 22mFrontier
Deal found 10/10$114
This Frontier deal was found by Cheapflights users on 10/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/63:58 pmBWI - ORD
Nonstop2h 16mFrontier
Tue 11/1112:37 pmORD - BWI
1 stop4h 52mFrontier
Deal found 10/12$114
This Frontier deal was found by Cheapflights users on 10/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:25 pmBWI - MDW
Nonstop2h 06mFrontier
Sun 11/95:40 amMDW - BWI
Nonstop1h 56mFrontier
Deal found 10/12$115
This Frontier deal was found by Cheapflights users on 10/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/104:07 pmBWI - ORD
Nonstop2h 16mFrontier
Fri 11/1412:04 pmORD - BWI
Nonstop2h 03mFrontier
Deal found 10/10$115

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 October 12, 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

Fri 10/31

9:11 pm-10:26 am

1 stop14h 15m

Chicago Midway

Sun 11/2

5:40 am-8:36 am

Nonstop1h 56m

$126

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Tue 11/11

4:45 pm-5:50 pm

Nonstop2h 05m

Chicago Midway

Tue 11/18

6:55 pm-9:45 pm

Nonstop1h 50m

$139

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sat 12/13

1:10 pm-2:19 pm

Nonstop2h 09m

Chicago O'Hare Intl

Sat 12/13

6:20 pm-9:19 pm

Nonstop1h 59m

$139

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Wed 12/10

12:40 pm-1:45 pm

Nonstop2h 05m

Chicago Midway

Tue 12/16

12:55 pm-3:40 pm

Nonstop1h 45m

$139

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Fri 11/7

7:30 pm-8:36 pm

Nonstop2h 06m

Chicago Midway

Sun 11/9

5:40 am-8:36 am

Nonstop1h 56m

$156

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sun 11/16

6:15 am-7:32 am

Nonstop2h 17m

Chicago O'Hare Intl

Wed 11/19

2:20 pm-5:14 pm

Nonstop1h 54m

$158

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Sun 11/16

7:45 am-8:50 am

Nonstop2h 05m

Chicago Midway

Wed 11/19

9:20 am-12:10 pm

Nonstop1h 50m

$158

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Mon 11/10

5:12 pm-6:20 pm

Nonstop2h 08m

Chicago O'Hare Intl

Wed 11/12

7:05 am-9:59 am

Nonstop1h 54m

$158

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Tue 11/4

4:45 pm-5:50 pm

Nonstop2h 05m

Chicago Midway

Wed 11/5

6:55 pm-9:45 pm

Nonstop1h 50m

$159

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sat 11/1

5:12 pm-6:20 pm

Nonstop2h 08m

Chicago O'Hare Intl

Tue 11/4

2:20 pm-5:14 pm

Nonstop1h 54m

$159

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/11

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 October 12, 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 37% 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 evenings 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 October 12, 2025.

The most flights from WAS to USIL are scheduled on a Sunday (78 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (54 on average).

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

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 October 12, 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
4,235 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Food

7.0

Comfort

8.0

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
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Food

7.0

Comfort

8.0

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
8,970 reviews
Southwest
8.0
Very good
4,235 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Food

7.0

Comfort

8.0

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
11,046 reviews
Southwest
8.0
Very good
4,235 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Food

7.0

Comfort

8.0

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
8,098 reviews
Southwest
8.0
Very good
4,235 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Food

7.0

Comfort

8.0

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
3,137 reviews
Southwest
8.0
Very good
4,235 reviews

Entertainment

7.5

Overall

8.0

Crew

8.6

Food

7.0

Comfort

8.0

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 05m. Frontier 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?

    $70 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on United Airlines and Frontier, with prices starting from $70 and $82, 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. Dulles Intl - Chicago O'Hare Intl, Washington, D.C. Reagan-National - 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 (100%), Air China (94%) and ANA (82%).

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

    On average you can expect to pay $905 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $120 while the most popular route, (Washington, D.C. Reagan-National - Chicago O'Hare Intl) is currently priced at $109.

  • 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 Dallas/Fort Worth flights
Reagan-National to Miami flights
Dulles Intl to Las Vegas flights
Dulles Intl to Orlando flights
Dulles Intl to Miami flights
Reagan-National to Orlando flights
Dulles Intl to Los Angeles flights
Reagan-National to Los Angeles flights
Dulles Intl to Atlanta flights
Reagan-National to O'Hare Intl flights
Reagan-National to Dallas/Fort Worth flights
Reagan-National to Las Vegas flights
Reagan-National to Atlanta flights
Dulles Intl to Hobby flights
Dulles Intl to O'Hare Intl flights
Reagan-National to Boston flights
Reagan-National to Seattle flights
Dulles Intl to Fort Lauderdale flights
Dulles Intl to New Orleans flights
Reagan-National to San Francisco flights
Dulles Intl to Seattle flights
Dulles Intl to George Bush Intcntl flights
Dulles Intl to Sky Harbor Intl flights
Reagan-National to Nashville flights
Dulles Intl to Tampa flights
Reagan-National to Hobby flights
Dulles Intl to Boston flights
Dulles Intl to San Francisco flights
Reagan-National to Fort Lauderdale flights
Dulles Intl to Austin flights
Reagan-National to George Bush Intcntl flights
Dulles Intl to John F Kennedy Intl flights
Reagan-National to New Orleans flights
Dulles Intl to Nashville flights
Dulles Intl to Midway flights
Dulles Intl to Detroit flights
Reagan-National to Minneapolis flights
Reagan-National to Sky Harbor Intl flights
Reagan-National to Tampa flights
Dulles Intl to Denver flights
Dulles Intl to Minneapolis flights
Reagan-National to Denver flights
Reagan-National to Detroit flights
Dulles Intl to San Diego flights
Dulles Intl to Salt Lake City flights
Reagan-National to Salt Lake City flights
Dulles Intl to Honolulu flights
Reagan-National to Austin flights
Reagan-National to John F Kennedy Intl flights
Dulles Intl to Charlotte 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 October 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$52Average$124FlexibilityNo cancel feeOn-time65%
FrontierCheapest$68Average$182FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$385FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$154Average$410FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$157Average$297FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$158Average$387FlexibilityNo 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.