HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Washington, D.C.

$93+ Cheap flights from Illinois to Washington, D.C. (WAS)

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 6/8. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — WAS
Jun 25 — Jul 21
Thu 6/25
Thu 7/2
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Washington, D.C. 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 Illinois to Washington, D.C.

Cheapest flights from Illinois to Washington, D.C.
Explore the most affordable flight options available from Illinois to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 26, 2026.

This Kiwi.com deal was found by Cheapflights users on 5/21. 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 7/26:31 pm
STL
-
BWI
1 stop27h 29m
Frontier
Tue 7/79:37 pm
BWI
-
STL
1 stop12h 20m
Frontier
Deal found 5/21$192
This Kiwi.com deal was found by Cheapflights users on 5/21. 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.
Mon 6/155:06 pm
STL
-
BWI
1 stop13h 29m
Frontier
Tue 6/308:31 am
BWI
-
STL
1 stop9h 59m
Frontier
Deal found 5/21$213
This Expedia deal was found by Cheapflights users on 5/21. 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.
Thu 11/56:30 am
ORD
-
BWI
1 stop11h 06m
Frontier
Mon 11/912:02 pm
BWI
-
ORD
Nonstop2h 24m
Frontier
Deal found 5/21$219
This American Airlines deal was found by Cheapflights users on 5/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/234:49 pm
ORD
-
BWI
1 stop6h 18m
American Airlines
Tue 6/308:00 pm
BWI
-
ORD
Nonstop2h 32m
American Airlines
Deal found 5/25$220
This Southwest deal was found by Cheapflights users on 5/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:00 am
MDW
-
BWI
1 stop4h 30m
Southwest
Tue 8/115:45 pm
BWI
-
MDW
Nonstop2h 00m
Southwest
Deal found 5/26$221
This American Airlines deal was found by Cheapflights users on 5/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:52 pm
ORD
-
BWI
Nonstop2h 07m
American Airlines
Thu 8/138:19 pm
BWI
-
ORD
1 stop4h 40m
American Airlines
Deal found 5/22$221
This Southwest deal was found by Cheapflights users on 5/25. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/127:45 am
MDW
-
BWI
1 stop3h 50m
Southwest
Tue 9/1511:20 am
BWI
-
MDW
1 stop3h 30m
Southwest
Deal found 5/25$222
This Frontier deal was found by Cheapflights users on 5/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/109:33 pm
ORD
-
BWI
1 stop10h 24m
Frontier
Thu 10/1511:09 am
BWI
-
ORD
Nonstop2h 23m
Frontier
Deal found 5/25$223
This Southwest deal was found by Cheapflights users on 5/21. 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.
Tue 8/46:30 am
MDW
-
BWI
Nonstop1h 45m
Southwest
Mon 8/106:30 am
BWI
-
MDW
Nonstop2h 00m
Southwest
Deal found 5/21$224
This Frontier deal was found by Cheapflights users on 5/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/247:00 am
ORD
-
BWI
Nonstop2h 14m
Frontier
Sun 10/2511:09 am
BWI
-
ORD
Nonstop2h 23m
Frontier
Deal found 5/25$224
This Southwest deal was found by Cheapflights users on 5/22. 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 7/18:10 am
MDW
-
BWI
Nonstop2h 00m
Southwest
Tue 7/74:50 pm
BWI
-
MDW
Nonstop2h 05m
Southwest
Deal found 5/22$225
This Southwest deal was found by Cheapflights users on 5/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1212:35 pm
MDW
-
BWI
1 stop3h 05m
Southwest
Mon 8/174:20 pm
BWI
-
MDW
1 stop4h 55m
Southwest
Deal found 5/26$226

Find flight deals from Illinois to Washington, D.C.

Keep the following information in mind while searching for Illinois to Washington, D.C. flight deals. Data was last updated May 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$192
(Kiwi.com)

One-way from

$93
(Kissandfly.com)

Popular in

March

Cheapest in

August

Average price

$303

Good round-trip deal

$276 or less

Good one-way deal

$144 or less
Provider with most accurate pricing for Chicago (CHI)-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Washington, D.C. (WAS) flights.
Search Deals
From Illinois to Washington, D.C. (WAS)
Search Deals
One-way flight from Illinois to Washington, D.C. (WAS)
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($55 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from Illinois to Washington, D.C. (WAS).
Search Deals
Price to beat on a one-way flight from Illinois to Washington, D.C. (WAS).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Washington, D.C. 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 May 26, 2026.
Use the filters below to find and compare flights from Illinois to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoBaltimore

MDW - BWI

MDWBWI

Chicago Midway

Wed 7/1

7:35 pm-10:25 pm

Nonstop1h 50m

Baltimore/Washington

Wed 7/8

2:30 pm-5:00 pm

1 stop3h 30m

$231

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Tue 8/11

6:50 am-9:49 am

Nonstop1h 59m

Baltimore/Washington

Thu 8/13

9:05 am-10:25 am

Nonstop2h 20m

$233
Quickest round-trip

ChicagoWashington, D.C.

MDW - DCA

MDWDCA

Chicago Midway

Tue 6/16

5:40 am-8:25 am

Nonstop1h 45m

Washington, D.C. Reagan-National

Wed 6/17

9:30 pm-10:30 pm

Nonstop2h 00m

$237

ChicagoWashington, D.C.

MDW - DCA

MDWDCA

Chicago Midway

Sat 6/20

8:00 am-11:00 am

Nonstop2h 00m

Washington, D.C. Reagan-National

Tue 6/23

7:55 pm-11:10 pm

1 stop4h 15m

$237

ChicagoWashington, D.C.

MDW - DCA

MDWDCA

Chicago Midway

Wed 10/21

1:05 pm-7:14 pm

1 stop5h 09m

Washington, D.C. Reagan-National

Sat 10/24

6:00 am-8:45 am

1 stop3h 45m

$238

ChicagoWashington, D.C.

ORD - DCA

ORDDCA

Chicago O'Hare Intl

Fri 7/10

6:00 am-8:54 am

Nonstop1h 54m

Washington, D.C. Reagan-National

Wed 7/15

11:57 am-1:15 pm

Nonstop2h 18m

$243

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Fri 7/10

1:30 pm-4:30 pm

Nonstop2h 00m

Washington, D.C. Dulles Intl

Wed 7/15

10:20 pm-11:31 pm

Nonstop2h 11m

$243

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Fri 7/24

1:30 pm-4:30 pm

Nonstop2h 00m

Washington, D.C. Dulles Intl

Wed 8/5

6:10 am-7:27 am

Nonstop2h 17m

$243

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Wed 7/15

5:18 pm-11:18 pm

1 stop5h 00m

Baltimore/Washington

Wed 7/22

5:40 am-10:10 am

1 stop5h 30m

$245

ChicagoWashington, D.C.

MDW - DCA

MDWDCA

Chicago Midway

Thu 7/9

5:05 pm-7:55 pm

Nonstop1h 50m

Washington, D.C. Reagan-National

Tue 7/14

11:45 am-5:05 pm

2 stops6h 20m

$252

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/25

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

Best time to book a flight from Illinois to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Illinois 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 Illinois to Washington, D.C.

What is the cheapest month to book a flight from Illinois to Washington, D.C.?

Currently, October is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $285). Flying from Illinois to Washington, D.C. in December is currently the most expensive (average of $676). 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 IL to WAS?

Find hourly flight availability from Illinois to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 26, 2026.

One of the essential ways to save on airfare from Illinois to Washington, D.C. is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 15% on airfare.

Weekly flight availability from Illinois to Washington, D.C.

Explore weekly flight availability from Illinois to Washington, D.C.. 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 May 26, 2026.

The most flights from USIL to WAS are scheduled on a Tuesday (92 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (31 on average).

How much does it cost to fly round-trip from Illinois to Washington, D.C.?

How far ahead should I book a flight from Illinois to Washington, D.C.?

The price you pay for your flight from Illinois to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 82 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest day to fly from Illinois to Washington, D.C.?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Washington, D.C.. Price data was last updated on May 23, 2026.

Travelers seeking maximum savings on their Illinois to Washington, D.C. flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Washington, D.C.. 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 Illinois to Washington, D.C.?

    Airlines like Southwest, United Airlines, and Delta fly from Illinois to Washington, D.C. in about 1h 50m. The time it takes to get you to your destination can typically vary by up to 3h 19m. The distance between Illinois and Washington, D.C. is about 609 mi. This flight may include one or multiple stops.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $55. However, be on the lookout for offers from American Airlines and Southwest, as they are both options that can get you from Illinois to Washington, D.C. for a low price.

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

    Most travelers choose Chicago O'Hare Intl - Baltimore/Washington, Chicago O'Hare Intl - Washington, D.C. Reagan-National or Chicago O'Hare Intl - Washington, D.C. Dulles Intl when deciding on the best route from Illinois to Washington, D.C..

  • What are the most reliable airlines from Illinois to Washington, D.C.?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to Washington, D.C. on time: Sun Country Air (100%), Air China (89%), ITA Airways (88%).

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

    On average you can expect to pay $635 for a flight from Illinois to Washington, D.C.. The cheapest flight overall is $119 while the most popular route, (Chicago O'Hare Intl - Baltimore/Washington) is currently priced at $170.

  • Can I find deals for flights from Illinois to Washington, D.C. that include hotel bookings?

    Yes. In addition to deals on Illinois to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Washington, D.C.?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Washington, D.C..

  • Can I find deals for business class flights from Illinois to Washington, D.C.?

    Yes. Cheapflights offers flight deals from Illinois to Washington, D.C. 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 Illinois to Washington, D.C.?

    Currently, October is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $285). Flying from Illinois to Washington, D.C. in December is currently the most expensive (average of $676). 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

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Tysons
Owings Mills
Springfield
Arlington
Reston
Herndon
Fredericksburg
Rockville
Hyattsville
Manassas
Hanover
Laurel
Falls Church
Waldorf
Silver Spring
Largo
Clinton
Hunt Valley
Woodbridge

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 Illinois to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.
Dallas/Fort Worth to Dulles Intl flights
Los Angeles to Reagan-National flights
Dallas/Fort Worth to Reagan-National flights
Los Angeles to Dulles Intl flights
Seattle to Dulles Intl flights
Atlanta to Dulles Intl flights
Seattle to Reagan-National flights
San Francisco to Dulles Intl flights
Boston to Reagan-National flights
Hobby to Dulles Intl flights
Hobby to Reagan-National flights
Boston to Dulles Intl flights
San Francisco to Reagan-National flights
Atlanta to Reagan-National flights
Denver to Dulles Intl flights
Orlando to Dulles Intl flights
Tampa to Dulles Intl flights
George Bush Intcntl to Reagan-National flights
George Bush Intcntl to Dulles Intl flights
O'Hare Intl to Reagan-National flights
Minneapolis to Dulles Intl flights
Orlando to Reagan-National flights
O'Hare Intl to Dulles Intl flights
Portland to Dulles Intl flights
San Diego to Dulles Intl flights
Austin to Dulles Intl flights
Sky Harbor Intl to Dulles Intl flights
Minneapolis to Reagan-National flights
Denver to Reagan-National flights
Miami to Reagan-National flights
Tampa to Reagan-National flights
Midway to Dulles Intl flights
Salt Lake City to Dulles Intl flights
John F Kennedy Intl to Dulles Intl flights
Fort Lauderdale to Dulles Intl flights
Ontario to Dulles Intl flights
Miami to Dulles Intl flights
John F Kennedy Intl to Reagan-National flights
Love Field to Reagan-National flights
Detroit to Dulles Intl flights
Detroit to Reagan-National flights
Austin to Reagan-National flights
LaGuardia to Reagan-National flights
Salt Lake City to Reagan-National flights
New Orleans to Dulles Intl flights
Sky Harbor Intl to Reagan-National flights
Portland to Reagan-National flights
Newark to Reagan-National flights
Nashville to Reagan-National flights
Sacramento to Dulles Intl flights

Top 7 airlines flying from Illinois to Washington, D.C.

Discover the top 7 airlines that operate flights from Illinois to Washington, D.C.. 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 May 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$45Average$102FlexibilityNo cancel feeOn-time65%
FrontierCheapest$58Average$188FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$127Average$284FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$140Average$358FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$141Average$254FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$148Average$394FlexibilityNo cancel feeOn-time71%
DeltaCheapest$183Average$364FlexibilityNo cancel feeOn-timeN/A

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.