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

$80 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on American Airlines and Spirit Airlines, with prices starting from $80 and $82, 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 cheapest flights from Washington, D.C. to Illinois?

On average you can expect to pay $734 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $95 while the most popular route, (Baltimore/Washington - Chicago O'Hare Intl) is currently priced at $94.

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 Sun Country Air (100%), Ethiopian Air (85%) and Avianca (82%).

What are the most popular airlines that fly from Washington, D.C. to Illinois?

Before booking your flight from Washington, D.C. to Illinois check out the most popular airlines for this route: American Airlines, Delta or Frontier.

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

Travelers have found it’s best to book a flight 51 days in advance to save up to 80% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 51 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Washington, D.C. to Illinois 1-2 weeks in advance for as low as $263, or $462 for flights within the next 24 hours.

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

Flights from Washington, D.C. to Illinois lean towards being more expensive in April. Prices are generally better when you fly from Washington, D.C. to Illinois in September, with the cheapest ticket starting at $63.

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.

$79+ Flights from Washington, D.C. to Illinois

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

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$146 (Kiwi.com)
One-way from	$80 (Southwest)
Popular in	April
Cheapest in	September
Average price	$275
Good round-trip deal	$167 or less
Good one-way deal	$104 or less

Provider with most accurate pricing for Washington, D.C. (WAS)-Chicago (CHI) flight deals.

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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Chicago (CHI) flights.

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From Washington, D.C. (WAS) to Illinois

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One-way flight from Washington, D.C. (WAS) to Illinois

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($18 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 0% potential price decrease ($3 potential savings vs. average RT price).

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Average for round-trip flights in May 2025

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Price to beat on a round-trip flight from Washington, D.C. (WAS) to Illinois.

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Price to beat on a 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 May 1, 2025.

Fri 7/184:31 pmBWI - MDW

Nonstop2h 04mFrontier

Mon 7/2112:50 pmMDW - BWI

Nonstop1h 56mFrontier

Deal found 4/30

$146

Sun 5/188:10 amBWI - ORD

Nonstop2h 14mSpirit Airlines

Thu 5/2210:33 amORD - BWI

Nonstop1h 46mSpirit Airlines

Deal found 4/30

$148

Fri 5/305:30 pmBWI - ORD

Nonstop2h 15mUnited Airlines

Mon 6/27:10 amORD - BWI

Nonstop2h 03mUnited Airlines

Deal found 4/30

$159

Sat 5/245:00 pmBWI - MDW

Nonstop2h 00mSouthwest

Sat 5/319:30 amMDW - BWI

1 stop3h 10mSouthwest

Deal found 4/29

$165

Sat 7/510:35 amBWI - ORD

Nonstop2h 15mSouthwest

Thu 7/101:50 pmORD - BWI

Nonstop2h 00mSouthwest

Deal found 4/30

$168

Mon 5/199:21 pmBWI - STL

1 stop27h 23mFrontier

Wed 5/215:45 pmSTL - BWI

1 stop13h 54mFrontier

Deal found 4/30

$181

Sat 5/246:50 pmDCA - MDW

1 stop4h 00mSouthwest

Sun 5/259:20 amMDW - DCA

1 stop4h 40mSouthwest

Deal found 4/29

$181

Thu 5/159:14 amIAD - ORD

1 stop23h 51mFrontier

Sat 5/179:19 amORD - IAD

1 stop22h 25mFrontier

Deal found 4/30

$189

Sat 5/315:00 amBWI - STL

1 stop4h 18mAmerican Airlines

Mon 6/26:57 pmSTL - BWI

1 stop3h 56mAmerican Airlines

Deal found 4/29

$189

Wed 5/285:27 pmBWI - ORD

1 stop5h 16mAmerican Airlines

Wed 6/47:04 pmORD - BWI

Nonstop2h 01mAmerican Airlines

Deal found 4/30

$189

Thu 5/153:32 pmIAD - MDW

1 stop9h 07mFrontier

Wed 5/286:40 amMDW - IAD

1 stop8h 34mFrontier

Deal found 4/30

$190

Thu 5/158:10 amBWI - ORD

Nonstop2h 14mMultiple Airlines

Sun 5/187:55 amORD - BWI

1 stop11h 31mMultiple Airlines

Deal found 4/30

$190

Best flights from Washington, D.C. to Illinois
Discover carefully curated flight deals from Washington, D.C. to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 1, 2025.

Fri 7/184:31 pmBWI - MDW

Nonstop2h 04mFrontier

Mon 7/2112:50 pmMDW - BWI

Nonstop1h 56mFrontier

Deal found 4/30

$146

Sun 5/258:10 amBWI - ORD

Nonstop2h 14mSpirit Airlines

Thu 5/2910:33 amORD - BWI

Nonstop1h 46mSpirit Airlines

Deal found 4/30

$148

Mon 6/27:57 pmBWI - ORD

1 stop13h 53mMultiple Airlines

Sat 6/76:00 amORD - BWI

1 stop9h 35mMultiple Airlines

Deal found 4/29

$151

Mon 6/211:19 amBWI - ORD

Nonstop2h 14mUnited Airlines

Tue 6/310:55 amORD - BWI

Nonstop2h 02mUnited Airlines

Deal found 4/29

$159

Sat 5/245:00 pmBWI - MDW

Nonstop2h 00mSouthwest

Sat 5/319:30 amMDW - BWI

1 stop3h 10mSouthwest

Deal found 4/29

$165

Sat 6/75:24 pmBWI - ORD

Nonstop2h 16mAmerican Airlines

Tue 6/108:20 amORD - BWI

Nonstop1h 56mAmerican Airlines

Deal found 4/28

$177

Sat 5/246:00 amDCA - ORD

1 stop4h 18mDelta

Sat 5/245:15 pmORD - DCA

1 stop3h 55mDelta

Deal found 4/30

$197

Sat 7/56:30 amDCA - ORD

1 stop5h 48mJetBlue

Wed 7/98:40 amORD - DCA

1 stop5h 05mJetBlue

Deal found 4/30

$202

Thu 5/2212:49 pmIAD - ORD

1 stop5h 32mSun Country Air

Thu 5/298:05 pmORD - IAD

1 stop14h 48mSun Country Air

Deal found 4/30

$245

Sun 6/153:58 pmIAD - MDW

1 stop16h 17mAllegiant Air

Sun 6/2211:45 amMDW - IAD

2 stops25h 38mAllegiant Air

Deal found 4/30

$290

Sat 7/510:35 amBWI - ORD

Nonstop2h 15mSouthwest

Thu 7/101:50 pmORD - BWI

Nonstop2h 00mSouthwest

Deal found 4/29

$168

Mon 5/199:21 pmBWI - STL

1 stop27h 23mFrontier

Wed 5/215:45 pmSTL - BWI

1 stop13h 54mFrontier

Deal found 4/30

$181

Last-minute flights from Washington, D.C. to Illinois
Discover last-minute flight deals from Washington, D.C. to Illinois. Data last updated May 1, 2025 and is based on user searches.

Mon 5/57:00 amDCA - MDW

1 stop13h 08mFrontier

Thu 5/158:03 pmMDW - DCA

1 stop15h 04mFrontier

Deal found 4/29

$201

Tue 5/611:47 amIAD - ORD

1 stop5h 54mFrontier

Thu 5/156:00 amORD - IAD

1 stop7h 23mFrontier

Deal found 4/30

$190

Tue 5/610:40 amBWI - STL

1 stop14h 26mFrontier

Wed 5/75:45 pmSTL - BWI

1 stop24h 31mFrontier

Deal found 4/30

$201

Tue 5/66:07 amBWI - ORD

1 stop11h 34mFrontier

Thu 5/156:00 amORD - BWI

1 stop10h 46mFrontier

Deal found 4/30

$208

Wed 5/711:45 amDCA - ORD

1 stop7h 51mJetBlue

Wed 5/144:03 pmORD - DCA

1 stop5h 55mJetBlue

Deal found 4/30

$243

Wed 5/77:26 amBWI - ORD

Nonstop2h 17mAmerican Airlines

Thu 5/297:04 pmORD - BWI

Nonstop2h 01mAmerican Airlines

Deal found 4/30

$248

Thu 5/81:38 pmBWI - MDW

Nonstop2h 07mFrontier

Mon 5/126:15 amMDW - BWI

Nonstop1h 58mFrontier

Deal found 4/29

$186

Thu 5/83:32 pmIAD - MDW

1 stop9h 07mFrontier

Sat 5/1010:48 amMDW - IAD

1 stop4h 46mFrontier

Deal found 4/30

$200

Fri 5/91:00 pmDCA - STL

1 stop21h 59mFrontier

Sat 5/108:15 pmSTL - DCA

1 stop14h 52mFrontier

Deal found 4/28

$208

Fri 5/95:26 pmIAD - STL

1 stop7h 48mFrontier

Sun 5/115:45 pmSTL - IAD

1 stop21h 51mFrontier

Deal found 4/29

$248

Sat 5/1012:51 pmBWI - ORD

1 stop11h 38mSpirit Airlines

Thu 5/1510:33 amORD - BWI

Nonstop1h 46mSpirit Airlines

Deal found 4/30

$149

Sat 5/1012:51 pmBWI - ORD

1 stop11h 38mMultiple Airlines

Mon 5/125:31 pmORD - BWI

1 stop6h 04mMultiple Airlines

Deal found 4/30

$198

One-way flights from Washington, D.C. to Illinois
Search for one-way flight options from Washington, D.C. to Illinois. Find affordable one-way fares based on user searches. Data last updated May 1, 2025.

Tue 6/36:45 pmBWI - MDW

Nonstop2h 05mSouthwest

Deal found 4/30

$80

Sat 6/76:00 amBWI - ORD

Nonstop2h 22mAmerican Airlines

Deal found 4/30

$80

Mon 6/212:51 pmBWI - ORD

1 stop8h 12mSpirit Airlines

Deal found 4/30

$82

Mon 5/1210:03 amBWI - MDW

Nonstop2h 06mFrontier

Deal found 4/30

$83

Fri 7/43:00 pmDCA - MDW

1 stop4h 30mSouthwest

Deal found 4/30

$86

Fri 5/165:26 pmIAD - ORD

1 stop7h 06mFrontier

Deal found 4/30

$88

Mon 5/195:26 pmIAD - STL

1 stop7h 40mFrontier

Deal found 4/30

$89

Sat 5/317:25 amDCA - ORD

Nonstop2h 15mUnited Airlines

Deal found 4/30

$90

Sun 6/83:58 pmIAD - MDW

1 stop16h 17mAllegiant Air

Deal found 4/30

$90

Fri 5/308:15 amDCA - STL

Nonstop2h 27mAmerican Airlines

Deal found 4/29

$90

Wed 6/117:50 amBWI - ORD

1 stop5h 55mSouthwest

Deal found 4/30

$90

Wed 5/282:54 pmDCA - ORD

Nonstop2h 19mAmerican Airlines

Deal found 4/30

$91

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Fri 7/18

4:31 pm-5:35 pm

Nonstop2h 04m

Chicago Midway

Mon 7/21

12:50 pm-3:46 pm

Nonstop1h 56m

$146

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sun 5/18

8:10 am-9:24 am

Nonstop2h 14m

Chicago O'Hare Intl

Thu 5/22

10:33 am-1:19 pm

Nonstop1h 46m

$148

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Fri 5/30

5:30 pm-6:45 pm

Nonstop2h 15m

Chicago O'Hare Intl

Mon 6/2

7:10 am-10:13 am

Nonstop2h 03m

$159

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Sat 5/24

5:00 pm-6:00 pm

Nonstop2h 00m

Chicago Midway

Sat 5/31

9:30 am-1:40 pm

1 stop3h 10m

$165

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sat 7/5

10:35 am-11:50 am

Nonstop2h 15m

Chicago O'Hare Intl

Thu 7/10

1:50 pm-4:50 pm

Nonstop2h 00m

$168

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Mon 5/19

9:21 pm-11:44 pm

1 stop27h 23m

Lambert-St Louis

Wed 5/21

5:45 pm-8:39 am

1 stop13h 54m

$181

Washington, D.C.Chicago

DCA - MDW

DCAMDW

Washington, D.C. Reagan-National

Sat 5/24

6:50 pm-9:50 pm

1 stop4h 00m

Chicago Midway

Sun 5/25

9:20 am-3:00 pm

1 stop4h 40m

$181

BaltimoreSt. Louis

BWI - STL

BWISTL

Baltimore/Washington

Sat 5/31

6:21 am-12:17 pm

1 stop6h 56m

Lambert-St Louis

Sat 5/31

6:47 pm-11:53 pm

1 stop4h 06m

$189

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 5/28

5:27 pm-9:43 pm

1 stop5h 16m

Chicago O'Hare Intl

Wed 6/4

7:04 pm-10:05 pm

Nonstop2h 01m

$189

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 5/15

9:14 am-8:05 am

1 stop23h 51m

Chicago O'Hare Intl

Sat 5/17

9:19 am-8:44 am

1 stop22h 25m

$189

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 60 results

...

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, 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 $321). 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?

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

The most flights from WAS to USIL are scheduled on a Wednesday (76 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).

Rainfall in Illinois 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

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

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta 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.

Alaska Airlines

8.0

Very good

9,972 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

9,972 reviews

Alaska Airlines

8.0

Very good

9,972 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,294 reviews

Alaska Airlines

8.0

Very good

9,972 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,934 reviews

Alaska Airlines

8.0

Very good

9,972 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,696 reviews

Alaska Airlines

8.0

Very good

9,972 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

JetBlue

7.3

Good

2,924 reviews

Alaska Airlines

8.0

Very good

9,972 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

What are the cheapest airlines to fly from Washington, D.C. to Illinois one-way?
$80 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on American Airlines and Spirit Airlines, with prices starting from $80 and $82, 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 Sun Country Air (100%), Ethiopian Air (85%) and Avianca (82%).
What are the cheapest flights from Washington, D.C. to Illinois?
On average you can expect to pay $734 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $95 while the most popular route, (Baltimore/Washington - Chicago O'Hare Intl) is currently priced at $94.
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 $321). 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

Browse thousands of different options on Cheapflights for your next trip

Top 6 airlines flying from Washington, D.C. to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$56	Average$176	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$58	Average$179	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$98	Average$326	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$142	Average$412	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$154	Average$375	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$167	Average$300	FlexibilityNo cancel fee	On-time63%

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$79+ 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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.

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

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Cheap 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 May 1, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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

Cheapest flights from Washington, D.C. to IllinoisExplore 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 May 1, 2025.

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 May 1, 2025.

Cheapflights Fare Finder

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

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.

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?

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 May 1, 2025.

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

Rainfall in Illinois by month

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

Temperature in Illinois by month

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

Reviews of airlines servicing Illinois

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta 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.

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?

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

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

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

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

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

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

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

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 Washington, D.C. to Illinois

See prices for flight routes from nearby airports that may be better suited for you.

Top 6 airlines flying from Washington, D.C. to Illinois

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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 May 1, 2025.