How long is the flight from Washington, D.C. to Illinois?

A quick flight from Washington, D.C. to Illinois can take about 2h 20m. Frontier provides one of the quickest options available for as low as $139. The distance from Washington, D.C. to Illinois is about 620 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

$16 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on American Airlines and Southwest, with prices starting from $78 and $85, respectively.

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.

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).

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. Dulles Intl - Chicago O'Hare Intl, Washington, D.C. Reagan-National - 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 $949 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $115 while the most popular route, (Washington, D.C. Reagan-National - Chicago O'Hare Intl) is currently priced at $173.

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 Egyptair (85%), Air China (84%) and ANA (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: United Airlines, American Airlines or Southwest.

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.

$60+ Flights from Washington, D.C. to Illinois

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

Airfare is below average for this route at the moment. Washington, D.C. to Illinois flights typically cost between $228 and $509 in January. The cheapest round-trip price found within the last 3 days was $82 on Frontier (Jan 8-Jan 9).

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Cheap 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 December 18, 2025.

Wed 12/316:15 amBWI - ORD

Nonstop2h 20mUnited Airlines

Thu 1/16:20 pmORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/15

$139

Wed 12/314:45 pmBWI - MDW

Nonstop2h 05mSouthwest

Thu 1/18:50 amMDW - BWI

1 stop4h 05mSouthwest

Deal found 12/17

$149

Thu 12/2510:45 amBWI - MDW

1 stop3h 15mSouthwest

Thu 1/18:50 amMDW - BWI

1 stop4h 05mSouthwest

Deal found 12/17

$154

Wed 12/245:19 pmBWI - ORD

Nonstop2h 20mUnited Airlines

Thu 12/256:20 pmORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/16

$174

Wed 12/244:49 pmBWI - MDW

1 stop6h 33mDelta

Thu 12/256:08 pmMDW - BWI

1 stop4h 23mDelta

Deal found 12/15

$177

Thu 12/252:00 pmBWI - ORD

1 stop6h 38mDelta

Thu 1/17:00 amORD - BWI

1 stop3h 49mDelta

Deal found 12/14

$177

Thu 12/256:00 amBWI - MDW

1 stop3h 49mDelta

Tue 1/66:14 pmMDW - BWI

1 stop3h 51mDelta

Deal found 12/15

$178

Thu 12/252:00 pmBWI - ORD

1 stop6h 38mDelta

Tue 1/69:55 amORD - BWI

1 stop4h 43mDelta

Deal found 12/15

$178

Wed 12/316:30 amBWI - ORD

1 stop13h 09mMultiple Airlines

Tue 1/62:26 pmORD - BWI

1 stop9h 03mMultiple Airlines

Deal found 12/16

$179

Wed 12/316:05 amIAD - ORD

1 stop17h 19mFrontier

Tue 1/62:26 pmORD - IAD

1 stop25h 24mFrontier

Deal found 12/17

$183

Wed 12/244:35 pmBWI - MDW

1 stop3h 40mSouthwest

Wed 12/316:40 amMDW - BWI

Nonstop1h 50mSouthwest

Deal found 12/14

$184

Tue 12/309:37 amBWI - ORD

Nonstop2h 18mFrontier

Mon 1/51:44 pmORD - BWI

Nonstop2h 07mFrontier

Deal found 12/14

$186

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 December 18, 2025.

Wed 1/218:00 amBWI - ORD

1 stop27h 41mFrontier

Sun 1/255:25 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/17

$97

Thu 1/229:26 amBWI - ORD

1 stop12h 37mSpirit Airlines

Sun 1/258:43 pmORD - BWI

1 stop10h 48mSpirit Airlines

Deal found 12/18

$134

Thu 1/2912:05 pmBWI - ORD

Nonstop2h 27mMultiple Airlines

Sun 2/18:43 pmORD - BWI

2 stops43h 27mMultiple Airlines

Deal found 12/17

$134

Thu 1/155:18 pmBWI - ORD

Nonstop2h 20mUnited Airlines

Sun 1/1811:05 amORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/16

$139

Wed 12/314:45 pmBWI - MDW

Nonstop2h 05mSouthwest

Thu 1/18:50 amMDW - BWI

1 stop4h 05mSouthwest

Deal found 12/17

$149

Wed 1/76:00 amBWI - MDW

1 stop3h 52mDelta

Sat 1/1011:21 amMDW - BWI

1 stop5h 25mDelta

Deal found 12/16

$179

Thu 1/2910:05 amDCA - ORD

1 stop8h 38mJetBlue

Tue 2/37:45 amORD - DCA

1 stop5h 44mJetBlue

Deal found 12/15

$197

Thu 2/126:30 amBWI - ORD

Nonstop2h 23mUnited Airlines

Sat 2/146:15 pmORD - BWI

Nonstop2h 02mUnited Airlines

Deal found 12/15

$139

Mon 1/197:40 amDCA - STL

Nonstop2h 44mAmerican Airlines

Mon 1/265:59 pmSTL - DCA

Nonstop2h 11mAmerican Airlines

Deal found 12/16

$295

Mon 1/125:45 amBWI - ORD

1 stop6h 50mFrontier

Sat 1/174:41 pmORD - BWI

1 stop6h 50mFrontier

Deal found 12/17

$148

Thu 1/291:00 pmBWI - ORD

1 stop9h 03mSpirit Airlines

Mon 2/28:43 pmORD - BWI

1 stop12h 48mSpirit Airlines

Deal found 12/17

$153

Thu 1/85:50 pmBWI - MDW

Nonstop2h 10mSouthwest

Mon 1/129:50 amMDW - BWI

Nonstop1h 50mSouthwest

Deal found 12/16

$159

Tue 1/1310:05 amBWI - ORD

Nonstop2h 20mUnited Airlines

Sun 1/186:15 pmORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/17

$149

Thu 1/811:24 amBWI - MDW

1 stop6h 05mDelta

Mon 1/129:32 amMDW - BWI

1 stop6h 06mDelta

Deal found 12/16

$179

Thu 1/295:37 pmIAD - MDW

1 stop5h 42mFrontier

Thu 2/56:20 amMDW - IAD

1 stop9h 08mFrontier

Deal found 12/15

$163

Wed 1/145:18 pmBWI - ORD

Nonstop2h 20mUnited Airlines

Thu 1/1511:05 amORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/16

$149

Thu 1/84:44 pmBWI - STL

1 stop6h 49mMultiple Airlines

Sun 1/115:11 pmSTL - BWI

1 stop17h 56mMultiple Airlines

Deal found 12/17

$181

Thu 1/221:45 pmBWI - MDW

Nonstop2h 10mSouthwest

Sun 1/257:05 amMDW - BWI

Nonstop1h 55mSouthwest

Deal found 12/14

$178

Fri 2/611:55 amDCA - ORD

1 stop6h 49mJetBlue

Mon 2/97:45 amORD - DCA

1 stop7h 34mJetBlue

Deal found 12/17

$197

Wed 1/145:18 pmBWI - ORD

Nonstop2h 20mUnited Airlines

Sun 1/1811:05 amORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/16

$149

Thu 1/297:22 amBWI - MDW

1 stop5h 37mDelta

Sun 2/16:35 pmMDW - BWI

1 stop3h 30mDelta

Deal found 12/16

$187

Thu 1/85:35 amBWI - STL

1 stop10h 13mFrontier

Sun 1/115:11 pmSTL - BWI

2 stops16h 27mFrontier

Deal found 12/17

$179

Wed 1/711:55 amDCA - ORD

1 stop6h 48mJetBlue

Sun 1/117:45 amORD - DCA

1 stop8h 49mJetBlue

Deal found 12/16

$197

Sat 1/314:44 pmBWI - STL

1 stop7h 49mMultiple Airlines

Sun 2/19:09 amSTL - BWI

2 stops24h 17mMultiple Airlines

Deal found 12/17

$200

Mon 1/124:20 pmBWI - MDW

1 stop3h 15mSouthwest

Thu 1/1510:45 amMDW - BWI

Nonstop1h 50mSouthwest

Deal found 12/15

$184

Wed 1/71:00 pmDCA - ORD

1 stop5h 43mJetBlue

Sat 1/107:45 amORD - DCA

1 stop8h 19mJetBlue

Deal found 12/16

$197

Fri 2/2711:45 amBWI - MDW

1 stop6h 52mDelta

Sun 3/16:40 pmMDW - BWI

1 stop4h 57mDelta

Deal found 12/17

$197

Tue 4/78:17 amBWI - STL

1 stop15h 16mFrontier

Thu 4/910:42 amSTL - BWI

1 stop6h 10mFrontier

Deal found 12/17

$184

Thu 1/221:00 pmDCA - ORD

1 stop5h 43mJetBlue

Mon 1/267:45 amORD - DCA

1 stop7h 34mJetBlue

Deal found 12/15

$197

Fri 2/277:35 amBWI - MDW

Nonstop2h 15mSouthwest

Sun 3/16:35 pmMDW - BWI

Nonstop1h 50mSouthwest

Deal found 12/17

$199

Last-minute flights from Washington, D.C. to Illinois
Discover last-minute flight deals from Washington, D.C. to Illinois. Data last updated December 18, 2025 and is based on user searches.

Wed 1/78:38 pmBWI - ORD

Nonstop2h 10mMultiple Airlines

Fri 1/99:10 amORD - BWI

Nonstop2h 02mMultiple Airlines

Deal found 12/17

$102

Thu 1/88:07 pmBWI - ORD

Nonstop2h 24mFrontier

Fri 1/94:20 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/17

$82

Thu 1/88:07 pmBWI - ORD

Nonstop2h 24mFrontier

Sun 1/114:20 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/17

$91

Fri 1/91:07 pmBWI - ORD

Nonstop2h 24mFrontier

Mon 1/1212:48 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/16

$83

Wed 1/146:00 amBWI - ORD

1 stop7h 08mFrontier

Sun 1/187:35 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/16

$100

Wed 1/218:00 amBWI - ORD

1 stop27h 41mFrontier

Thu 1/298:10 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/14

$94

Wed 1/218:00 amBWI - ORD

1 stop27h 41mFrontier

Sun 1/255:25 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/16

$98

Thu 1/2212:05 pmBWI - ORD

Nonstop2h 27mMultiple Airlines

Fri 1/238:43 pmORD - BWI

1 stop10h 48mMultiple Airlines

Deal found 12/16

$97

Thu 1/2912:05 pmBWI - ORD

Nonstop2h 27mFrontier

Mon 2/28:45 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/16

$88

Fri 1/3010:00 amBWI - ORD

Nonstop2h 27mFrontier

Sun 2/15:25 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/15

$90

Fri 1/3010:00 amBWI - ORD

Nonstop2h 27mFrontier

Mon 2/28:45 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/15

$93

Fri 1/3010:00 amBWI - ORD

Nonstop2h 27mMultiple Airlines

Fri 2/68:43 pmORD - BWI

1 stop10h 48mMultiple Airlines

Deal found 12/16

$101

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 December 18, 2025.

Tue 1/68:00 amBWI - STL

1 stop15h 33mFrontier

Deal found 12/17

$60

Thu 1/86:00 amIAD - STL

1 stop9h 48mFrontier

Deal found 12/17

$62

Wed 2/118:00 amDCA - STL

1 stop8h 53mFrontier

Deal found 12/17

$62

Fri 1/1610:08 pmIAD - STL

1 stop9h 43mFrontier

Deal found 12/18

$63

Wed 1/218:00 amBWI - STL

1 stop16h 33mFrontier

Deal found 12/18

$63

Sat 2/76:15 pmBWI - STL

1 stop6h 18mFrontier

Deal found 12/18

$64

Sat 1/248:00 amDCA - STL

1 stop7h 46mFrontier

Deal found 12/16

$64

Wed 1/287:10 amBWI - MDW

1 stop5h 55mFrontier

Deal found 12/16

$64

Tue 2/311:30 amBWI - ORD

1 stop7h 22mSpirit Airlines

Deal found 12/16

$64

Tue 1/2011:30 amBWI - ORD

1 stop7h 22mSpirit Airlines

Deal found 12/15

$65

Mon 1/261:00 pmBWI - ORD

1 stop9h 03mSpirit Airlines

Deal found 12/15

$66

Tue 3/35:58 pmBWI - STL

1 stop13h 53mFrontier

Deal found 12/18

$67

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

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$82 (Kiwi.com)
One-way from	$60 (Trip.com)
Popular in	November
Cheapest in	September
Average price	$269
Good round-trip deal	$167 or less
Good one-way deal	$111 or less

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

Search Deals

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

Search Deals

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

Search Deals

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

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($12 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

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

Search Deals

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

Search Deals

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 - ORD

BWIORD

Baltimore/Washington

Wed 1/21

8:00 am-10:41 am

1 stop27h 41m

Chicago O'Hare Intl

Sun 1/25

5:25 am-8:25 am

Nonstop2h 00m

$97

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/22

9:26 am-9:03 pm

1 stop12h 37m

Chicago O'Hare Intl

Sun 1/25

8:43 pm-8:31 am

1 stop10h 48m

$134

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/29

12:05 pm-1:32 pm

Nonstop2h 27m

Chicago O'Hare Intl

Sun 2/1

8:43 pm-5:10 pm

2 stops43h 27m

$134

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/15

5:18 pm-6:38 pm

Nonstop2h 20m

Chicago O'Hare Intl

Sun 1/18

11:05 am-2:11 pm

Nonstop2h 06m

$139

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 2/12

6:30 am-7:53 am

Nonstop2h 23m

Chicago O'Hare Intl

Sat 2/14

6:15 pm-9:17 pm

Nonstop2h 02m

$139

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Mon 1/12

5:45 am-11:35 am

1 stop6h 50m

Chicago O'Hare Intl

Sat 1/17

4:41 pm-12:31 am

1 stop6h 50m

$148

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Wed 12/31

4:45 pm-5:50 pm

Nonstop2h 05m

Chicago Midway

Thu 1/1

8:50 am-1:55 pm

1 stop4h 05m

$149

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Tue 1/13

10:05 am-11:25 am

Nonstop2h 20m

Chicago O'Hare Intl

Sun 1/18

6:15 pm-9:21 pm

Nonstop2h 06m

$149

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 1/14

5:18 pm-6:38 pm

Nonstop2h 20m

Chicago O'Hare Intl

Thu 1/15

11:05 am-2:11 pm

Nonstop2h 06m

$149

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 1/14

5:18 pm-6:38 pm

Nonstop2h 20m

Chicago O'Hare Intl

Sun 1/18

11:05 am-2:11 pm

Nonstop2h 06m

$149

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

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, March is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $49). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $133). 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?

One of the essential ways to save on airfare from Washington, D.C. to Illinois is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 33% on airfare.

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

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

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

Reviews of airlines servicing Illinois

Peruse reviews from past customers who have flown with Southwest, United Airlines, and American Airlines 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

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Southwest

7.9

Good

4,250 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

United Airlines

7.4

Good

9,091 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

American Airlines

7.2

Good

11,054 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Spirit Airlines

6.3

Okay

8,190 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Frontier

5.8

Fair

3,081 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

How long is the flight from Washington, D.C. to Illinois?
A quick flight from Washington, D.C. to Illinois can take about 2h 20m. Frontier provides one of the quickest options available for as low as $139. The distance from Washington, D.C. to Illinois is about 620 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
What are the cheapest airlines to fly from Washington, D.C. to Illinois one-way?
$16 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on American Airlines and Southwest, with prices starting from $78 and $85, 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. Dulles Intl - Chicago O'Hare Intl, Washington, D.C. Reagan-National - 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 Egyptair (85%), Air China (84%) and ANA (82%).
What are the cheapest flights from Washington, D.C. to Illinois?
On average you can expect to pay $949 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $115 while the most popular route, (Washington, D.C. Reagan-National - Chicago O'Hare Intl) is currently priced at $173.
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, March is the cheapest month in which you can book a flight from Washington, D.C. to Illinois (average of $49). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $133). 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$52	Average$120	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$58	Average$176	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$131	Average$343	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$150	Average$294	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$154	Average$404	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$234	Average$404	FlexibilityNo cancel fee	On-timeN/A

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$60+ 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 1/6. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap 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 December 18, 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 December 18, 2025.

Find 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 December 18, 2025.

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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 December 18, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Illinois. Price data was last updated on December 16, 2024.

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

Reviews of airlines servicing Illinois

Peruse reviews from past customers who have flown with Southwest, United Airlines, and American Airlines 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.

How long is the flight from Washington, D.C. to Illinois?

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?

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Alternative routes for Washington, D.C. to Illinois

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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 December 18, 2025.