HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$50+ 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 8/22. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$109
(Priceline)

One-way from

$50
(Priceline)

Popular in

April

Cheapest in

September

Average price

$263

Good round-trip deal

$157 or less

Good one-way deal

$84 or less
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. 6% potential increase in price ($17 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 3, 2025.

This Priceline deal was found by Cheapflights users on 7/2. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/76:25 amBWI - STL
1 stop9h 39mFrontier
Mon 9/224:00 pmSTL - BWI
1 stop7h 17mFrontier
Deal found 7/2$109
This Mytrip deal was found by Cheapflights users on 7/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/185:45 pmBWI - MDW
Nonstop2h 03mFrontier
Sun 9/211:59 pmMDW - BWI
Nonstop2h 01mFrontier
Deal found 7/1$114
This FlightHub deal was found by Cheapflights users on 7/3. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1111:36 amBWI - ORD
Nonstop2h 22mMultiple Airlines
Sun 8/176:20 amORD - BWI
Nonstop1h 49mMultiple Airlines
Deal found 7/3$114
This Priceline deal was found by Cheapflights users on 7/2. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1111:36 amBWI - ORD
Nonstop2h 22mFrontier
Wed 8/135:34 pmORD - BWI
1 stop5h 51mFrontier
Deal found 7/2$115
This FlightHub deal was found by Cheapflights users on 7/3. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/412:12 pmBWI - ORD
1 stop11h 36mSpirit Airlines
Sun 9/75:05 amORD - BWI
1 stop12h 25mSpirit Airlines
Deal found 7/3$134
This Southwest deal was found by Cheapflights users on 7/3. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/33:25 pmBWI - MDW
Nonstop2h 00mSouthwest
Sat 9/611:40 amMDW - BWI
Nonstop1h 50mSouthwest
Deal found 7/3$139
This Southwest deal was found by Cheapflights users on 7/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/310:35 amBWI - ORD
Nonstop2h 15mSouthwest
Wed 9/171:50 pmORD - BWI
Nonstop2h 05mSouthwest
Deal found 7/1$139
This Priceline deal was found by Cheapflights users on 6/30. 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.
Thu 8/147:15 amBWI - STL
1 stop7h 19mMultiple Airlines
Mon 8/182:30 pmSTL - BWI
1 stop6h 39mMultiple Airlines
Deal found 6/30$143
This Priceline deal was found by Cheapflights users on 7/1. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/71:29 pmIAD - MDW
1 stop7h 53mFrontier
Sat 8/96:20 amMDW - IAD
1 stop7h 52mFrontier
Deal found 7/1$150
This FlightHub deal was found by Cheapflights users on 7/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/162:30 pmBWI - STL
1 stop24h 02mSpirit Airlines
Mon 8/182:30 pmSTL - BWI
1 stop6h 39mSpirit Airlines
Deal found 7/1$150
This Priceline deal was found by Cheapflights users on 7/1. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/264:17 pmIAD - ORD
1 stop8h 12mFrontier
Sat 8/25:01 amORD - IAD
1 stop9h 11mFrontier
Deal found 7/1$151
This United Airlines deal was found by Cheapflights users on 7/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/266:25 amDCA - ORD
Nonstop2h 14mUnited Airlines
Thu 8/2812:50 pmORD - DCA
Nonstop2h 01mUnited Airlines
Deal found 7/2$157

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 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

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sun 9/7

6:25 am-3:04 pm

1 stop9h 39m

Lambert-St Louis

Mon 9/22

4:00 pm-12:17 am

1 stop7h 17m

$109

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Mon 8/11

11:36 am-12:58 pm

Nonstop2h 22m

Chicago O'Hare Intl

Sun 8/17

6:20 am-9:09 am

Nonstop1h 49m

$114

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Thu 9/18

5:45 pm-6:48 pm

Nonstop2h 03m

Chicago Midway

Thu 9/25

6:20 am-7:10 pm

1 stop11h 50m

$114

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 8/21

6:37 am-7:07 pm

1 stop13h 30m

Chicago O'Hare Intl

Sun 8/24

6:20 am-9:09 am

Nonstop1h 49m

$116

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Mon 7/28

11:36 am-12:58 pm

Nonstop2h 22m

Chicago O'Hare Intl

Wed 8/6

5:34 pm-12:25 am

1 stop5h 51m

$118

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Wed 9/3

3:25 pm-4:25 pm

Nonstop2h 00m

Chicago Midway

Sat 9/6

11:40 am-2:30 pm

Nonstop1h 50m

$139

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 9/3

10:35 am-11:50 am

Nonstop2h 15m

Chicago O'Hare Intl

Wed 9/17

1:50 pm-4:55 pm

Nonstop2h 05m

$139

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Thu 8/14

7:15 am-1:34 pm

1 stop7h 19m

Lambert-St Louis

Mon 8/18

2:30 pm-10:09 pm

1 stop6h 39m

$143

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 8/16

2:30 pm-1:32 pm

1 stop24h 02m

Lambert-St Louis

Mon 8/18

2:30 pm-10:09 pm

1 stop6h 39m

$150

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 8/7

1:29 pm-8:22 pm

1 stop7h 53m

Chicago Midway

Sat 8/9

6:20 am-3:12 pm

1 stop7h 52m

$150

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

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, August is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $245). Flying from Washington, D.C. 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 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 3, 2025.

When flying from Washington, D.C. 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 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 3, 2025.

The most flights from WAS to USIL are scheduled on a Wednesday (79 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 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 July 3, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United 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
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,266 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,982 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,861 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
JetBlue
7.3
Good
2,916 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,266 reviews

Boarding

8.2

Entertainment

7.6

Crew

8.6

Food

7.0

Overall

8.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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.

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

    $50 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 $68 and $70, 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 (88%), Ethiopian Air (80%) and Air China (79%).

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

    On average you can expect to pay $1,464 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $114 while the most popular route, (Baltimore/Washington - Chicago O'Hare Intl) is currently priced at $82.

  • 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, August is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $245). Flying from Washington, D.C. 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

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 Atlanta flights
Dulles Intl to Dallas/Fort Worth flights
Reagan-National to Seattle flights
Dulles Intl to Los Angeles flights
Reagan-National to Los Angeles flights
Dulles Intl to Las Vegas flights
Dulles Intl to Miami flights
Reagan-National to Miami flights
Reagan-National to O'Hare Intl flights
Dulles Intl to Seattle flights
Reagan-National to Boston flights
Dulles Intl to O'Hare Intl flights
Reagan-National to Hobby flights
Dulles Intl to San Francisco flights
Dulles Intl to Boston flights
Reagan-National to San Francisco flights
Dulles Intl to Hobby flights
Reagan-National to Atlanta flights
Dulles Intl to Orlando flights
Dulles Intl to Fort Lauderdale flights
Reagan-National to Las Vegas flights
Dulles Intl to Midway flights
Dulles Intl to George Bush Intcntl flights
Dulles Intl to Tampa flights
Reagan-National to Orlando flights
Dulles Intl to Denver flights
Reagan-National to Denver flights
Reagan-National to Dallas/Fort Worth flights
Reagan-National to Fort Lauderdale flights
Dulles Intl to Minneapolis flights
Dulles Intl to Detroit flights
Reagan-National to George Bush Intcntl flights
Reagan-National to Minneapolis flights
Dulles Intl to San Diego flights
Reagan-National to Austin flights
Dulles Intl to Ontario flights
Dulles Intl to Honolulu flights
Dulles Intl to San Antonio flights
Reagan-National to San Diego flights
Dulles Intl to New Orleans flights
Reagan-National to Detroit flights
Reagan-National to Midway flights
Dulles Intl to Portland flights
Reagan-National to Tampa flights
Dulles Intl to Sky Harbor Intl flights
Reagan-National to Sky Harbor Intl flights
Dulles Intl to Nashville flights
Dulles Intl to Austin flights
Dulles Intl to Love Field flights
Dulles Intl to Portland 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$55Average$144FlexibilityNo cancel feeOn-time65%
FrontierCheapest$58Average$181FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$329FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$153Average$405FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$156Average$378FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$163Average$297FlexibilityNo cancel feeOn-time63%

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.