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Washington, D.C.

$70+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — WAS
Apr 26 — May 31
Sun 4/26
Sun 5/3
1 adult, Economy
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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 March 27, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/23. 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 4/216:08 pm
ORD
-
BWI
1 stop5h 36m
Frontier
Tue 4/2812:17 pm
BWI
-
ORD
1 stop5h 43m
Frontier
Deal found 3/23$139
This Frontier deal was found by Cheapflights users on 3/23. 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.
Tue 4/212:15 pm
MDW
-
BWI
1 stop9h 29m
Frontier
Tue 4/285:49 pm
BWI
-
MDW
1 stop5h 25m
Frontier
Deal found 3/23$140
This Frontier deal was found by Cheapflights users on 3/22. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/146:08 pm
ORD
-
BWI
1 stop5h 36m
Frontier
Thu 4/167:54 pm
BWI
-
ORD
1 stop4h 50m
Frontier
Deal found 3/22$140
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:23 pm
STL
-
BWI
1 stop10h 39m
Frontier
Sat 4/185:45 pm
BWI
-
STL
1 stop6h 34m
Frontier
Deal found 3/25$140
This Super.com deal was found by Cheapflights users on 3/23. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:15 am
ORD
-
BWI
Nonstop2h 06m
Frontier
Wed 4/1512:17 pm
BWI
-
ORD
1 stop5h 43m
Frontier
Deal found 3/23$141
This Booking.com deal was found by Cheapflights users on 3/24. 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.
Sat 4/181:27 pm
ORD
-
BWI
1 stop18h 58m
Frontier
Tue 4/2112:17 pm
BWI
-
ORD
1 stop5h 43m
Frontier
Deal found 3/24$142
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.
Tue 4/1412:45 pm
ORD
-
BWI
1 stop10h 14m
Multiple Airlines
Thu 4/164:42 pm
BWI
-
ORD
Nonstop2h 26m
Multiple Airlines
Deal found 3/25$144
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.
Mon 4/205:50 am
ORD
-
BWI
1 stop10h 10m
Frontier
Tue 4/2112:17 pm
BWI
-
ORD
1 stop5h 43m
Frontier
Deal found 3/25$145
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:00 am
MDW
-
BWI
1 stop11h 22m
Frontier
Mon 5/116:45 am
BWI
-
MDW
1 stop5h 24m
Frontier
Deal found 3/26$146
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.
Thu 4/96:40 am
ORD
-
BWI
1 stop28h 47m
Frontier
Mon 4/133:19 pm
BWI
-
ORD
1 stop26h 41m
Frontier
Deal found 3/25$146
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/71:59 pm
ORD
-
BWI
1 stop7h 58m
Frontier
Mon 5/119:25 pm
BWI
-
ORD
1 stop11h 30m
Frontier
Deal found 3/25$147
This Frontier deal was found by Cheapflights users on 3/27. 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 4/1612:42 pm
ORD
-
BWI
Nonstop2h 05m
Frontier
Mon 4/204:10 pm
BWI
-
ORD
Nonstop2h 26m
Frontier
Deal found 3/27$148

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 March 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$139
(Kiwi.com)

One-way from

$70
(Priceline)

Popular in

November

Cheapest in

August

Average price

$300

Good round-trip deal

$204 or less

Good one-way deal

$140 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. 7% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 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 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 March 27, 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

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Wed 4/22

11:00 am-2:02 pm

Nonstop2h 02m

Baltimore/Washington

Wed 4/29

6:00 am-7:21 am

Nonstop2h 21m

$185
Quickest round-trip

ChicagoBaltimore

MDW - BWI

MDWBWI

Chicago Midway

Mon 5/11

9:25 pm-12:15 am

Nonstop1h 50m

Baltimore/Washington

Wed 5/13

6:30 am-7:35 am

Nonstop2h 05m

$204

ChicagoBaltimore

MDW - BWI

MDWBWI

Chicago Midway

Tue 5/12

7:00 am-9:50 am

Nonstop1h 50m

Baltimore/Washington

Sat 5/16

7:30 pm-8:40 pm

Nonstop2h 10m

$204

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Wed 4/15

2:30 pm-5:33 pm

Nonstop2h 03m

Baltimore/Washington

Sat 4/18

6:00 am-7:21 am

Nonstop2h 21m

$204

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Tue 5/26

1:35 pm-11:30 pm

1 stop8h 55m

Baltimore/Washington

Wed 5/27

3:20 pm-9:55 pm

1 stop7h 35m

$206

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Sat 4/18

6:15 pm-9:24 pm

Nonstop2h 09m

Baltimore/Washington

Thu 4/30

6:15 am-7:36 am

Nonstop2h 21m

$223

ChicagoBaltimore

MDW - BWI

MDWBWI

Chicago Midway

Thu 4/23

9:15 pm-12:05 am

Nonstop1h 50m

Baltimore/Washington

Mon 4/27

9:15 pm-10:20 pm

Nonstop2h 05m

$223

ChicagoWashington, D.C.

ORD - DCA

ORDDCA

Chicago O'Hare Intl

Thu 5/7

6:00 am-8:56 am

Nonstop1h 56m

Washington, D.C. Reagan-National

Mon 5/11

6:00 pm-7:22 pm

Nonstop2h 22m

$223

ChicagoWashington, D.C.

ORD - DCA

ORDDCA

Chicago O'Hare Intl

Sat 4/18

11:15 am-2:14 pm

Nonstop1h 59m

Washington, D.C. Reagan-National

Thu 4/30

8:20 am-9:41 am

Nonstop2h 21m

$223

ChicagoWashington, D.C.

MDW - DCA

MDWDCA

Chicago Midway

Thu 5/7

5:00 pm-7:55 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Mon 5/11

9:35 pm-10:35 pm

Nonstop2h 00m

$223

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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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, February is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $56). Flying from Illinois to Washington, D.C. in April is currently the most expensive (average of $156). 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 March 27, 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 19% on airfare.

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 March 23, 2026.

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

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 March 27, 2026.

The most flights from USIL to WAS are scheduled on a Thursday (75 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (14 on average).

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

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 Frontier, United Airlines, and Southwest fly from Illinois to Washington, D.C. in about 2h 02m. The time it takes to get you to your destination can typically vary by up to 7h 27m. The distance between Illinois and Washington, D.C. is about 620 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 Southwest and American Airlines, 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 - Washington, D.C. Dulles Intl, Chicago O'Hare Intl - Baltimore/Washington or Chicago O'Hare Intl - Washington, D.C. Reagan-National 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: Air China (88%), Avianca (79%), Ethiopian Air (79%).

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

    On average you can expect to pay $1,041 for a flight from Illinois to Washington, D.C.. The cheapest flight overall is $114 while the most popular route, (Chicago O'Hare Intl - Washington, D.C. Dulles Intl) is currently priced at $150.

  • 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, February is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $56). Flying from Illinois to Washington, D.C. in April is currently the most expensive (average of $156). 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
Woodbridge
Tysons
Owings Mills
Arlington
Springfield
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
Fredericksburg
Largo
Bowie
Clinton
Towson
College Park
Cordova

Browse thousands of different options on Cheapflights for your next trip

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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
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O'Hare Intl to Dulles Intl flights
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O'Hare Intl to Reagan-National flights
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Orlando to Dulles Intl flights
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George Bush Intcntl to Reagan-National flights
Fort Lauderdale to Dulles Intl flights
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Tampa to Dulles Intl flights
Detroit to Dulles Intl flights
Minneapolis to Dulles Intl flights
Miami to Dulles Intl flights
Denver to Reagan-National flights
Detroit to Reagan-National flights
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Ontario to Reagan-National flights
San Diego to Dulles Intl flights
John F Kennedy Intl to Dulles Intl flights
Austin to Reagan-National flights
Charlotte to Dulles Intl flights
Fort Lauderdale to Reagan-National flights
San Diego to Reagan-National flights
Midway to Dulles Intl flights
Tampa to Reagan-National flights
John F Kennedy Intl to Reagan-National flights
Sky Harbor Intl to Reagan-National flights
Hartford to Dulles Intl flights
Portland to Dulles Intl flights
Salt Lake City to Dulles Intl flights
Cincinnati to Reagan-National flights
Newark 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 March 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$42Average$118FlexibilityNo cancel feeOn-time65%
FrontierCheapest$57Average$213FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$114Average$357FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$141Average$254FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$152Average$394FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$157Average$289FlexibilityNo cancel feeOn-time63%
DeltaCheapest$183Average$361FlexibilityNo cancel feeOn-timeN/A

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