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$55+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ORD
Jan 25 — Feb 11
Sat 1/25
Sat 2/1
1 adult, Economy
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Cheap flight deals from Washington, D.C. to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 20, 2025.

Round-trip from

$111
(Frontier)

One-way from

$55
(Frontier)
From Washington, D.C. (WAS) to Illinois
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One-way flight from Washington, D.C. (WAS) to Illinois
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Find 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 January 20, 2025.

This Frontier deal was found by Cheapflights users on 1/19. 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 2/224:10 pmBWI - STL
1 stop8h 33mFrontier
Mon 2/245:20 pmSTL - BWI
1 stop13h 01mFrontier
Deal found 1/19$111
This FlightHub deal was found by Cheapflights users on 1/20. 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.
Fri 2/144:21 pmBWI - MDW
Nonstop2h 12mFrontier
Sat 2/224:48 pmMDW - BWI
1 stop6h 22mFrontier
Deal found 1/20$124
This FlightHub deal was found by Cheapflights users on 1/20. 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.
Wed 5/76:00 amBWI - ORD
1 stop5h 52mMultiple Airlines
Sat 5/106:15 amORD - BWI
1 stop7h 57mMultiple Airlines
Deal found 1/20$125
This Frontier deal was found by Cheapflights users on 1/20. 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 2/2012:17 pmBWI - ORD
1 stop10h 49mFrontier
Mon 2/247:08 pmORD - BWI
1 stop11h 13mFrontier
Deal found 1/20$129
This Southwest deal was found by Cheapflights users on 1/19. 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 2/188:50 pmBWI - MDW
Nonstop2h 10mSouthwest
Tue 2/256:55 pmMDW - BWI
Nonstop1h 50mSouthwest
Deal found 1/19$137
This Southwest deal was found by Cheapflights users on 1/19. 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 2/188:05 pmBWI - ORD
Nonstop2h 25mSouthwest
Tue 2/257:00 amORD - BWI
Nonstop1h 55mSouthwest
Deal found 1/19$137
This CheapOair deal was found by Cheapflights users on 1/19. 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 2/185:25 amBWI - STL
1 stop10h 17mMultiple Airlines
Tue 2/255:20 pmSTL - BWI
1 stop13h 01mMultiple Airlines
Deal found 1/19$148
This CheapOair deal was found by Cheapflights users on 1/20. 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.
Fri 5/94:15 pmBWI - ORD
1 stop7h 06mSpirit Airlines
Sat 5/106:15 amORD - BWI
1 stop5h 22mSpirit Airlines
Deal found 1/20$154
This American Airlines deal was found by Cheapflights users on 1/19. 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 4/27:30 amBWI - ORD
Nonstop2h 21mAmerican Airlines
Wed 4/96:59 pmORD - BWI
Nonstop1h 57mAmerican Airlines
Deal found 1/19$158
This American Airlines deal was found by Cheapflights users on 1/20. 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 2/128:45 pmDCA - ORD
Nonstop2h 19mAmerican Airlines
Wed 2/191:43 pmORD - DCA
Nonstop1h 46mAmerican Airlines
Deal found 1/20$179
This United Airlines deal was found by Cheapflights users on 1/20. 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.
Sat 2/1510:20 pmIAD - ORD
Nonstop2h 09mUnited Airlines
Sat 2/224:10 pmORD - IAD
Nonstop1h 51mUnited Airlines
Deal found 1/20$179
This Frontier deal was found by Cheapflights users on 1/19. 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 4/183:25 pmIAD - MDW
1 stop9h 25mFrontier
Sat 4/268:21 amMDW - IAD
1 stop4h 51mFrontier
Deal found 1/19$179

Find flights from Washington, D.C. to Illinois within your budget

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 January 20, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Tue 2/4

10:10 am-11:31 pm

1 stop14h 21m

Lambert-St Louis

Sat 2/8

5:05 pm-7:51 am

1 stop13h 46m

$119

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Wed 2/19

5:11 pm-6:23 pm

Nonstop2h 12m

Chicago Midway

Sun 2/23

4:19 pm-10:34 am

1 stop17h 15m

$123

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 5/7

6:00 am-10:52 am

1 stop5h 52m

Chicago O'Hare Intl

Sat 5/10

6:15 am-3:12 pm

1 stop7h 57m

$125

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 5/15

6:36 pm-11:11 pm

1 stop5h 35m

Chicago O'Hare Intl

Mon 5/19

10:55 am-7:08 pm

1 stop7h 13m

$127

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Tue 2/18

8:50 pm-10:00 pm

Nonstop2h 10m

Chicago Midway

Tue 2/25

6:55 pm-9:45 pm

Nonstop1h 50m

$137

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Tue 2/18

8:05 pm-9:30 pm

Nonstop2h 25m

Chicago O'Hare Intl

Tue 2/25

7:00 am-9:55 am

Nonstop1h 55m

$137

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 2/12

5:22 pm-6:40 pm

Nonstop2h 18m

Chicago O'Hare Intl

Wed 2/19

10:55 am-1:53 pm

Nonstop1h 58m

$148

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sat 5/17

4:15 pm-10:21 pm

1 stop7h 06m

Chicago O'Hare Intl

Sun 5/18

6:15 am-3:12 pm

1 stop7h 57m

$154

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 4/2

7:30 am-8:51 am

Nonstop2h 21m

Chicago O'Hare Intl

Wed 4/9

6:59 pm-9:56 pm

Nonstop1h 57m

$158

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Wed 2/26

5:00 pm-11:43 pm

1 stop7h 43m

Lambert-St Louis

Sun 3/2

4:00 pm-9:43 am

1 stop16h 43m

$158

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 60 results
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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.

Travel insights for flights from Washington, D.C. to Illinois

Get recent, data-driven insights about flights from Washington, D.C. to Illinois including ideal travel times, pricing trends, and more.

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

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $245). Flying from Washington, D.C. to Illinois in March is currently the most expensive (average of $320). 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 January 20, 2025.

When flying from Washington, D.C. to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 January 20, 2025.

The most flights from WAS to USIL are scheduled on a Wednesday (65 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (32 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 January 20, 2025.
Peruse reviews from past customers who have flown with United Airlines, Spirit Airlines and Southwest 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
8.1
Very good
4,659 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,521 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Qatar Airways
7.5
Good
3,754 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

JetBlue
7.4
Good
3,201 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,982 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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.

  • 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 Southwest and United Airlines, with prices starting from $69 and $70, 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 ANA (93%), United Airlines (91%) and Royal Jordanian (86%).

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

    On average you can expect to pay $1,209 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $99 while the most popular route, (Washington, D.C. Dulles Intl - Chicago O'Hare Intl) is currently priced at $179.

  • 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, August is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $245). Flying from Washington, D.C. to Illinois in March is currently the most expensive (average of $320). 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.

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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 January 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$171FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$101Average$193FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$136Average$418FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$151Average$399FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$159Average$298FlexibilityNo cancel feeOn-time63%
DeltaCheapest$175Average$278FlexibilityNo cancel feeOn-timeN/A
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