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$58+ 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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Mar 11 — Mar 181
Wed 3/11
Wed 3/18
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 February 9, 2026.

This Frontier deal was found by Cheapflights users on 2/6. 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 5/14:25 pm
BWI
-
ORD
Nonstop2h 26m
Frontier
Mon 5/412:25 pm
ORD
-
BWI
Nonstop2h 05m
Frontier
Deal found 2/6$107
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Thu 5/74:25 pm
BWI
-
ORD
Nonstop2h 26m
Multiple Airlines
Tue 5/128:25 am
ORD
-
BWI
1 stop24h 32m
Multiple Airlines
Deal found 2/8$111
This Kiwi.com deal was found by Cheapflights users on 2/6. 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.
Thu 2/269:19 am
BWI
-
ORD
Nonstop2h 27m
Frontier
Thu 3/55:15 am
ORD
-
BWI
Nonstop2h 09m
Frontier
Deal found 2/6$112
This Frontier deal was found by Cheapflights users on 2/8. 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 5/74:25 pm
BWI
-
ORD
Nonstop2h 26m
Frontier
Sun 5/104:28 pm
ORD
-
BWI
1 stop7h 21m
Frontier
Deal found 2/8$113
This Frontier deal was found by Cheapflights users on 2/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:19 am
BWI
-
ORD
Nonstop2h 27m
Frontier
Mon 3/24:42 pm
ORD
-
BWI
1 stop6h 49m
Frontier
Deal found 2/7$114
This Gotogate deal was found by Cheapflights users on 2/5. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:19 am
BWI
-
ORD
Nonstop2h 27m
Multiple Airlines
Sun 3/18:16 pm
ORD
-
BWI
1 stop11h 50m
Multiple Airlines
Deal found 2/5$115
This Travelocity deal was found by Cheapflights users on 2/7. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/304:25 pm
BWI
-
ORD
Nonstop2h 26m
Frontier
Sun 5/312:25 pm
ORD
-
BWI
Nonstop2h 05m
Frontier
Deal found 2/7$116
This Kiwi.com deal was found by Cheapflights users on 2/7. 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.
Fri 3/64:28 pm
BWI
-
ORD
Nonstop2h 27m
Frontier
Mon 3/912:38 pm
ORD
-
BWI
Nonstop2h 09m
Frontier
Deal found 2/7$117
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Sat 3/74:53 pm
BWI
-
MDW
1 stop6h 31m
Frontier
Tue 3/106:00 am
MDW
-
BWI
1 stop7h 24m
Frontier
Deal found 2/8$119
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 2/2411:30 am
BWI
-
ORD
1 stop7h 16m
Multiple Airlines
Thu 2/265:15 am
ORD
-
BWI
Nonstop2h 09m
Multiple Airlines
Deal found 2/7$119
This Frontier deal was found by Cheapflights users on 2/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/197:19 pm
BWI
-
ORD
Nonstop2h 27m
Frontier
Fri 2/278:39 am
ORD
-
BWI
1 stop8h 32m
Frontier
Deal found 2/7$120
This Kiwi.com deal was found by Cheapflights users on 2/6. 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.
Thu 2/197:19 pm
BWI
-
ORD
Nonstop2h 27m
Multiple Airlines
Fri 2/2012:44 pm
ORD
-
BWI
1 stop9h 09m
Multiple Airlines
Deal found 2/6$121

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 February 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$107
(Frontier)

One-way from

$58
(CheapOair)

Popular in

December

Cheapest in

September

Average price

$237

Good round-trip deal

$220 or less

Good one-way deal

$118 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. 4% potential increase in price ($12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 9, 2026.
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 - ORD

BWIORD

Baltimore/Washington

Fri 5/8

4:25 pm-5:51 pm

Nonstop2h 26m

Chicago O'Hare Intl

Sun 5/10

12:25 pm-3:30 pm

Nonstop2h 05m

$132

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 4/30

6:15 am-7:36 am

Nonstop2h 21m

Chicago O'Hare Intl

Sat 5/2

6:00 pm-9:02 pm

Nonstop2h 02m

$150

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sat 2/28

5:20 pm-6:43 pm

Nonstop2h 23m

Chicago O'Hare Intl

Mon 3/2

6:15 pm-9:17 pm

Nonstop2h 02m

$159

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Sat 4/18

8:09 am-4:13 pm

1 stop9h 04m

Chicago Midway

Sat 4/25

2:20 pm-12:36 am

1 stop9h 16m

$160

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 4/23

9:51 am-7:31 pm

1 stop10h 40m

Chicago Midway

Sun 4/26

9:14 am-7:27 am

1 stop21h 13m

$160

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Fri 4/10

10:00 pm-7:51 am

1 stop10h 51m

Lambert-St Louis

Mon 4/13

4:54 pm-4:40 pm

1 stop22h 46m

$160

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Tue 3/10

12:30 pm-9:13 pm

1 stop9h 43m

Chicago O'Hare Intl

Tue 3/17

12:45 pm-11:59 pm

1 stop10h 14m

$161

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 3/11

8:09 am-9:32 am

Nonstop2h 23m

Chicago O'Hare Intl

Sat 3/14

6:40 pm-9:42 pm

Nonstop2h 02m

$170

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Thu 4/16

9:07 am-7:31 pm

1 stop11h 24m

Chicago Midway

Tue 4/21

2:20 pm-12:49 am

1 stop9h 29m

$176

Washington, D.C.Chicago

DCA - ORD

DCAORD

Washington, D.C. Reagan-National

Wed 3/4

3:30 pm-4:51 pm

Nonstop2h 21m

Chicago O'Hare Intl

Sat 3/7

7:00 am-9:54 am

Nonstop1h 54m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/8

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, March is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $49). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $133). 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 February 9, 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 25% 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 February 7, 2026.

Travelers seeking maximum savings on their Washington, D.C. to Illinois flight should consider departing on Monday afternoons 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.

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 February 9, 2026.
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
4,282 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,282 reviews
Southwest
8.0
Very good
4,282 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,259 reviews
Southwest
8.0
Very good
4,282 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,258 reviews
Southwest
8.0
Very good
4,282 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Spirit Airlines
6.3
Okay
8,430 reviews
Southwest
8.0
Very good
4,282 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.7
Fair
3,051 reviews
Southwest
8.0
Very good
4,282 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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. Frontier provides one of the quickest options available for as low as $150. 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?

    $16 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. 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 Ethiopian Air (88%), Air China (83%) and Egyptair (81%).

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

    On average you can expect to pay $1,076 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $158 while the most popular route, (Baltimore/Washington - Chicago O'Hare Intl) is currently priced at $119.

  • 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 $49). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $133). 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.
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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 February 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$41Average$110FlexibilityNo cancel feeOn-time65%
FrontierCheapest$57Average$168FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$131Average$348FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$148Average$298FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$154Average$407FlexibilityNo cancel feeOn-time71%
DeltaCheapest$194Average$404FlexibilityNo cancel feeOn-timeN/A

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