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$67+ 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 12/16. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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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 September 11, 2025.

Round-trip from

$107
(Cheapflightsfares)

One-way from

$67
(United Airlines)

Popular in

April

Cheapest in

September

Average price

$201

Good round-trip deal

$139 or less

Good one-way deal

$87 or less
From Washington, D.C. (WAS) to Illinois
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One-way flight from Washington, D.C. (WAS) to Illinois
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Highest demand for flights based on searches. 7% potential increase in price ($21 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Washington, D.C. (WAS) to Illinois.
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Price to beat on a one-way flight from Washington, D.C. (WAS) to Illinois.
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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 September 11, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/224:06 pmBWI - MDW
Nonstop2h 09mFrontier
Sun 11/2312:25 pmMDW - BWI
Nonstop1h 56mFrontier
Deal found 9/11$107
This Priceline deal was found by Cheapflights users on 9/11. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/148:45 amBWI - MDW
1 stop5h 53mFrontier
Sat 10/1812:30 pmMDW - BWI
Nonstop1h 57mFrontier
Deal found 9/11$108
This Priceline deal was found by Cheapflights users on 9/8. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/229:59 pmBWI - ORD
Nonstop2h 21mFrontier
Thu 9/256:11 pmORD - BWI
Nonstop2h 03mFrontier
Deal found 9/8$108
This Mytrip deal was found by Cheapflights users on 9/10. 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.
Thu 10/25:40 pmBWI - MDW
Nonstop2h 03mFrontier
Mon 10/65:33 pmMDW - BWI
1 stop6h 20mFrontier
Deal found 9/10$109
This Frontier deal was found by Cheapflights users on 9/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/29:59 pmBWI - ORD
Nonstop2h 21mFrontier
Sat 10/45:40 pmORD - BWI
1 stop5h 26mFrontier
Deal found 9/8$111
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3111:08 amBWI - MDW
1 stop7h 07mFrontier
Sun 11/25:40 amMDW - BWI
Nonstop1h 56mFrontier
Deal found 9/10$113
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/269:59 pmBWI - ORD
Nonstop2h 21mMultiple Airlines
Sun 9/286:10 amORD - BWI
Nonstop1h 52mMultiple Airlines
Deal found 9/11$113
This Frontier deal was found by Cheapflights users on 9/10. 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.
Wed 10/18:12 amBWI - MDW
1 stop8h 46mFrontier
Mon 10/61:49 pmMDW - BWI
Nonstop2h 01mFrontier
Deal found 9/10$114
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/255:40 pmBWI - MDW
Nonstop2h 03mFrontier
Fri 9/265:15 pmMDW - BWI
1 stop6h 02mFrontier
Deal found 9/10$115
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/29:59 pmBWI - ORD
Nonstop2h 21mFrontier
Fri 10/35:50 pmORD - BWI
1 stop5h 27mFrontier
Deal found 9/10$115
This Frontier deal was found by Cheapflights users on 9/11. 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.
Wed 9/248:12 amBWI - MDW
1 stop8h 46mFrontier
Thu 9/251:49 pmMDW - BWI
Nonstop2h 01mFrontier
Deal found 9/11$116
This Frontier deal was found by Cheapflights users on 9/11. 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.
Thu 11/64:15 pmBWI - ORD
1 stop8h 56mFrontier
Fri 11/72:45 pmORD - BWI
Nonstop2h 03mFrontier
Deal found 9/11$116

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 September 11, 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

Tue 11/4

8:55 am-10:10 am

Nonstop2h 15m

Chicago Midway

Wed 12/3

6:55 pm-9:45 pm

Nonstop1h 50m

$129

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 10/1

10:51 am-12:05 pm

Nonstop2h 14m

Chicago O'Hare Intl

Fri 10/3

6:15 pm-9:22 pm

Nonstop2h 07m

$133

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Wed 10/1

10:45 am-11:45 am

Nonstop2h 00m

Chicago Midway

Thu 10/2

8:05 pm-10:55 pm

Nonstop1h 50m

$133

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Sat 11/15

11:20 am-12:25 pm

Nonstop2h 05m

Chicago Midway

Sun 11/16

5:05 am-7:55 am

Nonstop1h 50m

$133

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Mon 10/6

7:30 pm-8:35 pm

Nonstop2h 05m

Chicago Midway

Tue 10/7

7:55 am-10:45 am

Nonstop1h 50m

$133

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Tue 11/11

6:15 am-7:31 am

Nonstop2h 16m

Chicago O'Hare Intl

Wed 12/10

2:30 pm-5:25 pm

Nonstop1h 55m

$139

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Wed 9/24

9:15 am-3:58 pm

1 stop7h 43m

Chicago Midway

Sat 9/27

10:51 am-6:24 pm

1 stop6h 33m

$143

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Sat 11/1

5:00 pm-6:23 pm

Nonstop2h 23m

Chicago O'Hare Intl

Tue 11/4

1:36 pm-7:35 pm

1 stop4h 59m

$143

Washington, D.C.Chicago

DCA - MDW

DCAMDW

Washington, D.C. Reagan-National

Thu 10/30

3:10 pm-4:10 pm

Nonstop2h 00m

Chicago Midway

Tue 11/4

8:10 am-4:05 pm

1 stop6h 55m

$143

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sat 11/8

6:15 am-7:32 am

Nonstop2h 17m

Chicago O'Hare Intl

Sun 11/9

7:05 am-9:59 am

Nonstop1h 54m

$144

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 60 results
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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 September 11, 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 September 11, 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 (34 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 September 11, 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
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
8,023 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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 14m. Southwest provides one of the quickest options available for as low as $133. The distance from Washington, D.C. to Illinois is about 620 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 United Airlines. You may also be able to find cheap deals on Frontier and Southwest, with prices starting from $72 and $74, respectively.

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

    While some choose either Washington, D.C. Dulles Intl - Chicago O'Hare Intl or Baltimore/Washington - 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 (92%), Air China (91%) and Ethiopian Air (74%).

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

    On average you can expect to pay $973 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $128 while the most popular route, (Washington, D.C. Reagan-National - Chicago O'Hare Intl) is currently priced at $117.

  • 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

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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.
Dulles Intl to Dallas/Fort Worth flights
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Dulles Intl to Ontario 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$46Average$125FlexibilityNo cancel feeOn-time65%
FrontierCheapest$61Average$187FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$400FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$154Average$407FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$157Average$296FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$158Average$380FlexibilityNo cancel feeOn-time69%

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