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$63+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
May 10 — May 171
Sun 5/10
Sun 5/17
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 April 10, 2026.

This Kiwi.com deal was found by Cheapflights users on 4/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:49 pm
BWI
-
STL
1 stop14h 01m
Frontier
Wed 4/298:23 pm
STL
-
BWI
1 stop10h 39m
Frontier
Deal found 4/8$125
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 6/99:43 pm
BWI
-
STL
1 stop12h 09m
Frontier
Tue 6/166:31 pm
STL
-
BWI
1 stop12h 04m
Frontier
Deal found 4/7$126
This Kiwi.com deal was found by Cheapflights users on 4/5. 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 5/59:13 pm
BWI
-
STL
1 stop12h 42m
Frontier
Wed 5/135:27 pm
STL
-
BWI
1 stop13h 16m
Frontier
Deal found 4/5$127
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/69:13 pm
BWI
-
STL
1 stop20h 41m
Frontier
Wed 5/135:27 pm
STL
-
BWI
1 stop13h 16m
Frontier
Deal found 4/6$128
This Kiwi.com deal was found by Cheapflights users on 4/5. 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 5/59:13 pm
BWI
-
STL
1 stop12h 42m
Frontier
Mon 5/115:27 pm
STL
-
BWI
1 stop13h 16m
Frontier
Deal found 4/5$129
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 5/69:13 pm
BWI
-
STL
1 stop20h 41m
Frontier
Mon 5/115:27 pm
STL
-
BWI
1 stop13h 16m
Frontier
Deal found 4/7$133
This Frontier deal was found by Cheapflights users on 4/6. 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 5/15:35 pm
BWI
-
STL
1 stop6h 44m
Frontier
Mon 5/48:23 pm
STL
-
BWI
1 stop10h 20m
Frontier
Deal found 4/6$140
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 5/139:13 pm
BWI
-
STL
1 stop20h 41m
Frontier
Wed 5/205:27 pm
STL
-
BWI
1 stop13h 16m
Frontier
Deal found 4/7$141
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 4/306:05 am
BWI
-
STL
1 stop5h 21m
Frontier
Mon 5/48:23 pm
STL
-
BWI
1 stop10h 20m
Frontier
Deal found 4/7$148
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 5/199:13 pm
BWI
-
STL
1 stop12h 42m
Frontier
Tue 5/266:33 pm
STL
-
BWI
1 stop12h 10m
Frontier
Deal found 4/7$152
This Kiwi.com deal was found by Cheapflights users on 4/6. 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.
Sat 4/2511:46 am
BWI
-
ORD
1 stop13h 13m
Multiple Airlines
Wed 4/298:52 pm
ORD
-
BWI
2 stops19h 19m
Multiple Airlines
Deal found 4/6$191
This Southwest deal was found by Cheapflights users on 4/6. 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 5/2010:25 am
BWI
-
MDW
1 stop4h 25m
Southwest
Tue 5/267:40 am
MDW
-
BWI
1 stop4h 05m
Southwest
Deal found 4/6$192

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 April 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$125
(Kiwi.com)

One-way from

$63
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$310

Good round-trip deal

$296 or less

Good one-way deal

$178 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. 9% potential increase in price ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 10, 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 5/20

3:10 pm-4:15 pm

Nonstop2h 05m

Chicago Midway

Mon 5/25

9:25 pm-12:15 am

Nonstop1h 50m

$198

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Tue 5/5

2:18 pm-6:35 pm

1 stop5h 17m

Chicago O'Hare Intl

Sat 5/9

12:00 pm-6:51 pm

1 stop5h 51m

$218

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 4/30

6:15 am-7:36 am

Nonstop2h 21m

Chicago O'Hare Intl

Mon 5/4

6:00 pm-9:02 pm

Nonstop2h 02m

$219

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 4/30

6:15 am-7:36 am

Nonstop2h 21m

Chicago O'Hare Intl

Thu 4/30

6:00 pm-9:02 pm

Nonstop2h 02m

$219

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Wed 5/20

3:10 pm-4:15 pm

Nonstop2h 05m

Chicago Midway

Sun 5/24

9:20 am-12:10 pm

Nonstop1h 50m

$227

Washington, D.C.Chicago

DCA - MDW

DCAMDW

Washington, D.C. Reagan-National

Thu 5/14

9:35 pm-10:35 pm

Nonstop2h 00m

Chicago Midway

Sat 5/16

10:30 am-3:20 pm

1 stop3h 50m

$229

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 6/11

8:15 am-9:36 am

Nonstop2h 21m

Chicago O'Hare Intl

Tue 6/16

1:18 pm-4:26 pm

Nonstop2h 08m

$233

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Wed 5/6

9:05 am-12:50 pm

1 stop4h 45m

Chicago O'Hare Intl

Wed 5/13

11:55 am-8:45 pm

2 stops7h 50m

$233

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 6/17

6:15 am-7:30 am

Nonstop2h 15m

Chicago O'Hare Intl

Mon 6/22

9:25 pm-12:33 am

Nonstop2h 08m

$233
Quickest round-trip

Washington, D.C.Chicago

DCA - MDW

DCAMDW

Washington, D.C. Reagan-National

Sat 5/23

4:45 pm-5:45 pm

Nonstop2h 00m

Chicago Midway

Tue 5/26

6:05 am-8:55 am

Nonstop1h 50m

$233

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/5

Showing 1-10 of 60 resultsSorted by cheapest first
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2
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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 $139). 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 April 10, 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 April 4, 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. Thursday 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 April 10, 2026.

The most flights from WAS to USIL are scheduled on a Thursday (84 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (36 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 April 10, 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
4,334 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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
4,334 reviews
Southwest
8.0
Very good
4,334 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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
9,561 reviews
Southwest
8.0
Very good
4,334 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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
11,564 reviews
Southwest
8.0
Very good
4,334 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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
8,606 reviews
Southwest
8.0
Very good
4,334 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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
2,997 reviews
Southwest
8.0
Very good
4,334 reviews

Entertainment

7.5

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Food

7.0

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 05m. Southwest provides one of the quickest options available for as low as $198. 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?

    $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 $78 and $85, 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 CommutAir (100%), Egyptair (85%) and ANA (81%).

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

    On average you can expect to pay $629 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $135 while the most popular route, (Washington, D.C. Dulles Intl - Chicago O'Hare Intl) is currently priced at $145.

  • 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 $139). 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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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 April 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$29Average$170FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$41Average$108FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$131Average$349FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$134Average$293FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$154Average$394FlexibilityNo cancel feeOn-time71%
DeltaCheapest$234Average$410FlexibilityNo cancel feeOn-timeN/A

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