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Washington, D.C.

$55+ 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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — WAS
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap 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 July 30, 2025.

Round-trip from

$113
(Gotogate)

One-way from

$55
(Booking.com)

Popular in

January

Cheapest in

August

Average price

$229

Good round-trip deal

$139 or less

Good one-way deal

$107 or less
From Illinois to Washington, D.C. (WAS)
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One-way flight from Illinois to Washington, D.C. (WAS)
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Highest demand for flights based on searches. 4% potential increase in price ($10 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Illinois to Washington, D.C. (WAS).
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Price to beat on a one-way flight from Illinois to Washington, D.C. (WAS).
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Find 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 July 30, 2025.

This Gotogate deal was found by Cheapflights users on 7/29. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2812:20 pmMDW - BWI
Nonstop1h 56mFrontier
Sun 8/312:42 pmBWI - MDW
Nonstop2h 04mFrontier
Deal found 7/29$113
This Kiwi.com deal was found by Cheapflights users on 7/29. 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 8/198:12 pmORD - BWI
1 stop11h 58mSpirit Airlines
Thu 8/2110:04 amBWI - ORD
Nonstop2h 06mSpirit Airlines
Deal found 7/29$113
This Kiwi.com deal was found by Cheapflights users on 7/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/211:15 pmORD - BWI
Nonstop2h 06mMultiple Airlines
Sat 8/2312:21 pmBWI - ORD
1 stop7h 46mMultiple Airlines
Deal found 7/28$117
This Frontier deal was found by Cheapflights users on 7/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/56:11 pmORD - BWI
Nonstop2h 03mFrontier
Sun 9/149:59 pmBWI - ORD
Nonstop2h 21mFrontier
Deal found 7/29$129
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/142:30 pmSTL - BWI
1 stop6h 39mSpirit Airlines
Sun 8/172:30 pmBWI - STL
1 stop24h 02mSpirit Airlines
Deal found 7/28$145
This Southwest deal was found by Cheapflights users on 7/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1011:45 amMDW - BWI
Nonstop1h 50mSouthwest
Sat 9/133:40 pmBWI - MDW
Nonstop2h 00mSouthwest
Deal found 7/28$161
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1010:45 amORD - BWI
Nonstop2h 03mUnited Airlines
Sat 9/1310:51 amBWI - ORD
Nonstop2h 14mUnited Airlines
Deal found 7/28$161
This Booking.com deal was found by Cheapflights users on 7/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/26:20 amMDW - IAD
1 stop7h 52mFrontier
Tue 8/56:10 amIAD - MDW
1 stop5h 30mFrontier
Deal found 7/29$177
This Mytrip deal was found by Cheapflights users on 7/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/412:05 pmSTL - BWI
1 stop9h 23mMultiple Airlines
Sun 9/79:27 pmBWI - STL
1 stop16h 35mMultiple Airlines
Deal found 7/29$185
This Cheapflightsfares deal was found by Cheapflights users on 7/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/202:40 pmORD - IAD
1 stop5h 59mFrontier
Sat 8/236:10 amIAD - ORD
1 stop6h 26mFrontier
Deal found 7/28$186
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1011:30 amORD - DCA
Nonstop1h 54mAmerican Airlines
Wed 9/103:28 pmDCA - ORD
1 stop4h 37mAmerican Airlines
Deal found 7/29$193
This JetBlue deal was found by Cheapflights users on 7/28. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/286:45 amORD - DCA
1 stop6h 47mJetBlue
Tue 10/285:45 pmDCA - ORD
1 stop5h 03mJetBlue
Deal found 7/28$197

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 July 30, 2025.
Use the filters below to find and compare flights from Illinois to Washington, D.C. that are best for you.

Fly from

Illinois

Fly to

Washington, D.C.

Route

Depart

Return

Price

ChicagoBaltimore

MDW - BWI

MDWBWI

Chicago Midway

Thu 8/28

12:20 pm-3:16 pm

Nonstop1h 56m

Baltimore/Washington

Sun 8/31

2:42 pm-3:46 pm

Nonstop2h 04m

$113

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Tue 8/19

8:12 pm-9:10 am

1 stop11h 58m

Baltimore/Washington

Thu 8/21

10:04 am-11:10 am

Nonstop2h 06m

$113

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Thu 8/21

1:15 pm-4:21 pm

Nonstop2h 06m

Baltimore/Washington

Sat 8/23

12:21 pm-7:07 pm

1 stop7h 46m

$117

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Fri 9/5

6:11 pm-9:14 pm

Nonstop2h 03m

Baltimore/Washington

Sun 9/14

9:59 pm-11:20 pm

Nonstop2h 21m

$129

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 8/14

2:30 pm-10:09 pm

1 stop6h 39m

Baltimore/Washington

Sun 8/17

2:30 pm-1:32 pm

1 stop24h 02m

$145

ChicagoBaltimore

MDW - BWI

MDWBWI

Chicago Midway

Wed 9/10

11:45 am-2:35 pm

Nonstop1h 50m

Baltimore/Washington

Sat 9/13

3:40 pm-4:40 pm

Nonstop2h 00m

$161

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Wed 9/10

10:45 am-1:48 pm

Nonstop2h 03m

Baltimore/Washington

Sat 9/13

10:51 am-12:05 pm

Nonstop2h 14m

$161

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Sat 8/2

6:20 am-3:12 pm

1 stop7h 52m

Washington, D.C. Dulles Intl

Tue 8/5

6:10 am-10:40 am

1 stop5h 30m

$177

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 9/4

12:05 pm-10:28 pm

1 stop9h 23m

Baltimore/Washington

Sun 9/7

9:27 pm-1:02 pm

1 stop16h 35m

$185

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Wed 8/20

2:40 pm-9:39 pm

1 stop5h 59m

Washington, D.C. Dulles Intl

Sat 8/23

6:10 am-11:36 am

1 stop6h 26m

$186

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 60 results
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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, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $241). Flying from Illinois to Washington, D.C. in March is currently the most expensive (average of $290). 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 July 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Washington, D.C. as you normally would.

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 July 30, 2025.

The most flights from USIL to WAS are scheduled on a Wednesday (82 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (26 on average).

Reviews of airlines servicing Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. 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 Washington, D.C.. Reviews last updated July 30, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Illinois to Washington, D.C.. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,241 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,241 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,896 reviews
Southwest
8.0
Very good
4,241 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
JetBlue
7.3
Good
2,913 reviews
Southwest
8.0
Very good
4,241 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,241 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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.

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

    The cheapest airline one-way is Spirit Airlines, with whom users have recently found tickets for as low as $55. However, be on the lookout for offers from Frontier 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 - Washington, D.C. Reagan-National, Chicago O'Hare Intl - Washington, D.C. Dulles Intl or Chicago O'Hare Intl - Baltimore/Washington 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: Republic Airways (100%), Spirit Airlines (93%), United Airlines (85%).

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

    On average you can expect to pay $168 for a flight from Illinois to Washington, D.C.. The cheapest flight overall is $58 while the most popular route, (Chicago O'Hare Intl - Washington, D.C. Reagan-National) is currently priced at $203.

  • 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, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $241). Flying from Illinois to Washington, D.C. in March is currently the most expensive (average of $290). 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
Woodbridge
Arlington
Alexandria
Tysons
Silver Spring
Fredericksburg
Gaithersburg
Towson
Linthicum Heights
Easton
Fairfax
Manassas
Falls Church
Waldorf
Laurel
Rockville
Oxon Hill
National Harbor
Dundalk
Bowie

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.
Los Angeles to Reagan-National flights
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Dallas/Fort Worth to Reagan-National flights
Boston to Reagan-National flights
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Top 6 airlines flying from Illinois to Washington, D.C.

Discover the top 6 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$42Average$183FlexibilityNo cancel feeOn-time65%
FrontierCheapest$74Average$201FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$127Average$386FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$140Average$284FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$153Average$343FlexibilityNo cancel feeOn-time69%
DeltaCheapest$166Average$378FlexibilityNo cancel feeOn-timeN/A

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