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$69+ 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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Apr 29 — May 61
Wed 4/29
Wed 5/6
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 March 30, 2026.

This Expedia deal was found by Cheapflights users on 3/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:35 pm
BWI
-
STL
1 stop6h 44m
Frontier
Wed 4/298:23 pm
STL
-
BWI
1 stop10h 39m
Frontier
Deal found 3/28$140
This CheapOair deal was found by Cheapflights users on 3/28. 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.
Mon 4/207:04 pm
BWI
-
STL
1 stop29h 15m
Frontier
Fri 4/244:59 pm
STL
-
BWI
1 stop26h 52m
Frontier
Deal found 3/28$151
This Frontier deal was found by Cheapflights users on 3/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/272:23 pm
BWI
-
STL
1 stop9h 56m
Frontier
Mon 5/48:23 pm
STL
-
BWI
1 stop10h 20m
Frontier
Deal found 3/30$160
This Kiwi.com deal was found by Cheapflights users on 3/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/59:25 pm
BWI
-
STL
1 stop12h 30m
Frontier
Mon 5/115:27 pm
STL
-
BWI
1 stop13h 16m
Frontier
Deal found 3/30$170
This CheapOair deal was found by Cheapflights users on 3/26. 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.
Sat 5/25:45 pm
BWI
-
STL
1 stop6h 34m
Frontier
Sat 5/164:19 pm
STL
-
BWI
1 stop15h 56m
Frontier
Deal found 3/26$171
This Kiwi.com deal was found by Cheapflights users on 3/25. 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 4/2212:17 pm
BWI
-
MDW
1 stop8h 14m
Frontier
Sun 4/262:00 pm
MDW
-
BWI
2 stops17h 02m
Frontier
Deal found 3/25$171
This CheapOair deal was found by Cheapflights users on 3/25. 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.
Sun 4/129:18 am
BWI
-
ORD
1 stop23h 59m
Frontier
Wed 4/156:08 pm
ORD
-
BWI
1 stop5h 36m
Frontier
Deal found 3/25$171
This Booking.com deal was found by Cheapflights users on 3/26. 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.
Mon 4/279:38 am
BWI
-
STL
1 stop14h 41m
Frontier
Tue 4/284:59 pm
STL
-
BWI
1 stop22h 41m
Frontier
Deal found 3/26$172
This Kiwi.com deal was found by Cheapflights users on 3/26. 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.
Tue 4/710:19 am
BWI
-
ORD
1 stop7h 56m
Spirit Airlines
Wed 4/812:45 pm
ORD
-
BWI
1 stop5h 59m
Spirit Airlines
Deal found 3/26$172
This Kiwi.com deal was found by Cheapflights users on 3/29. 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.
Tue 5/129:25 pm
BWI
-
STL
1 stop12h 30m
Frontier
Mon 6/15:27 pm
STL
-
BWI
1 stop13h 16m
Frontier
Deal found 3/29$173
This Trip.com deal was found by Cheapflights users on 3/28. 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.
Thu 4/2310:00 pm
BWI
-
MDW
1 stop20h 54m
Frontier
Mon 4/272:15 pm
MDW
-
BWI
1 stop9h 29m
Frontier
Deal found 3/28$173
This Kiwi.com deal was found by Cheapflights users on 3/29. 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.
Tue 4/1412:17 pm
BWI
-
ORD
1 stop5h 43m
Multiple Airlines
Fri 4/177:15 pm
ORD
-
BWI
1 stop13h 00m
Multiple Airlines
Deal found 3/29$173

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 March 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$140
(Expedia)

One-way from

$69
(Super.com)

Popular in

March

Cheapest in

September

Average price

$309

Good round-trip deal

$295 or less

Good one-way deal

$175 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 ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 30, 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

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Wed 4/22

6:30 am-7:35 am

Nonstop2h 05m

Chicago Midway

Sat 4/25

8:35 am-1:45 pm

1 stop4h 10m

$210

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sat 5/30

8:15 am-9:36 am

Nonstop2h 21m

Chicago O'Hare Intl

Mon 6/1

9:40 pm-12:45 am

Nonstop2h 05m

$223
Quickest round-trip

Washington, D.C.Chicago

DCA - MDW

DCAMDW

Washington, D.C. Reagan-National

Thu 4/16

9:35 pm-10:35 pm

Nonstop2h 00m

Chicago Midway

Mon 4/20

8:05 pm-10:55 pm

Nonstop1h 50m

$223

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Tue 4/28

6:00 am-10:19 am

1 stop5h 19m

Chicago O'Hare Intl

Thu 4/30

2:25 pm-9:05 pm

1 stop5h 40m

$224

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Wed 4/15

6:00 am-8:47 am

1 stop3h 47m

Chicago Midway

Sat 4/18

6:38 pm-11:03 pm

1 stop3h 25m

$224

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Wed 4/22

1:00 pm-6:25 pm

1 stop6h 25m

Chicago O'Hare Intl

Sat 4/25

1:55 pm-8:55 pm

1 stop6h 00m

$224

Washington, D.C.Chicago

DCA - MDW

DCAMDW

Washington, D.C. Reagan-National

Wed 4/22

4:55 pm-10:15 pm

1 stop6h 20m

Chicago Midway

Sat 4/25

9:10 am-6:55 pm

2 stops8h 45m

$229

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 5/21

6:10 am-7:25 am

Nonstop2h 15m

Chicago O'Hare Intl

Tue 5/26

9:25 pm-12:33 am

Nonstop2h 08m

$237

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 4/29

3:42 pm-5:00 pm

Nonstop2h 18m

Chicago O'Hare Intl

Wed 5/6

11:10 am-2:13 pm

Nonstop2h 03m

$239

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Tue 4/28

3:42 pm-5:00 pm

Nonstop2h 18m

Chicago O'Hare Intl

Tue 5/5

2:25 pm-5:28 pm

Nonstop2h 03m

$239

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

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, January is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $57). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $134). 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 March 30, 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 18% 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 March 28, 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.

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 March 30, 2026.

The most flights from WAS to USIL are scheduled on a Monday (86 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (41 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 March 30, 2026.
Peruse reviews from past customers who have flown with Southwest,United Airlines, andAmerican 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
4,332 reviews

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,332 reviews
Southwest
8.0
Very good
4,332 reviews

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,525 reviews
Southwest
8.0
Very good
4,332 reviews

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,543 reviews
Southwest
8.0
Very good
4,332 reviews

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Spirit Airlines
6.3
Okay
8,564 reviews
Southwest
8.0
Very good
4,332 reviews

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.7
Fair
3,008 reviews
Southwest
8.0
Very good
4,332 reviews

Overall

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 21m. Southwest provides one of the quickest options available for as low as $223. The distance from Washington, D.C. to Illinois is about 587 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?

    $55 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 $73 and $85, 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 Washington, D.C. Reagan-National - 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 CommutAir (100%), ITA Airways (100%) and Ethiopian Air (79%).

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

    On average you can expect to pay $656 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $135 while the most popular route, (Baltimore/Washington - Chicago O'Hare Intl) is currently priced at $148.

  • 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, January is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $57). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $134). 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 O'Hare Intl flights
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Reagan-National to San Francisco flights
Reagan-National to Hobby flights
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Dulles Intl to Sky Harbor Intl flights
Reagan-National to Tampa flights
Reagan-National to Fort Lauderdale flights
Dulles Intl to Midway flights
Reagan-National to Nashville flights
Dulles Intl to Austin flights
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Dulles Intl to Salt Lake City flights
Reagan-National to Sky Harbor Intl flights
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Dulles Intl to Portland flights
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Reagan-National to Salt Lake City flights
Reagan-National to Charleston flights
Reagan-National to Detroit flights
Reagan-National to Austin flights
Dulles Intl to Indianapolis flights
Dulles Intl to Minneapolis flights
Reagan-National to Midway 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 March 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$29Average$171FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$41Average$108FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$131Average$348FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$134Average$293FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$154Average$410FlexibilityNo cancel feeOn-time71%
DeltaCheapest$234Average$414FlexibilityNo cancel feeOn-timeN/A

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