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. Southwest provides one of the quickest options available for as low as $105. The distance from Washington, D.C. to Illinois is about 609 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 Washington, D.C. Dulles Intl - Chicago O'Hare Intl or Washington, D.C. Reagan-National - 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 $932 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $109 while the most popular route, (Baltimore/Washington - Chicago O'Hare Intl) is currently priced at $75.

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 Air China (91%), Egyptair (89%) and ANA (84%).

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.

$50+ 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 $247 and $414 in February. The cheapest round-trip price found within the last 3 days was $98 on American Airlines (Feb 14-Feb 17).

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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 3, 2025.

Wed 12/108:00 amBWI - ORD

1 stop7h 31mFrontier

Sun 12/145:11 amORD - BWI

Nonstop2h 07mFrontier

Deal found 12/2

$106

Mon 12/83:36 pmBWI - ORD

Nonstop2h 18mFrontier

Sun 12/145:11 amORD - BWI

Nonstop2h 07mFrontier

Deal found 12/1

$107

Wed 12/318:00 pmBWI - MDW

Nonstop2h 05mSouthwest

Wed 1/79:50 amMDW - BWI

Nonstop1h 50mSouthwest

Deal found 12/1

$115

Wed 12/315:19 pmBWI - ORD

Nonstop2h 20mUnited Airlines

Wed 1/711:05 amORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/1

$115

Mon 12/153:36 pmBWI - ORD

Nonstop2h 18mFrontier

Wed 12/174:01 pmORD - BWI

1 stop7h 23mFrontier

Deal found 12/2

$118

Thu 12/114:38 pmBWI - ORD

1 stop8h 31mMultiple Airlines

Sun 12/145:11 amORD - BWI

Nonstop2h 07mMultiple Airlines

Deal found 12/1

$120

Tue 12/98:00 amBWI - ORD

1 stop8h 12mFrontier

Tue 12/164:22 pmORD - BWI

1 stop7h 02mFrontier

Deal found 12/2

$122

Mon 12/810:40 amBWI - ORD

1 stop12h 08mMultiple Airlines

Sun 12/145:11 amORD - BWI

Nonstop2h 07mMultiple Airlines

Deal found 12/1

$123

Mon 12/153:36 pmBWI - ORD

Nonstop2h 18mFrontier

Fri 1/21:40 pmORD - BWI

Nonstop2h 07mFrontier

Deal found 12/1

$124

Mon 12/2910:12 amBWI - ORD

Nonstop2h 18mFrontier

Mon 1/124:20 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/2

$125

Mon 12/153:36 pmBWI - ORD

Nonstop2h 18mFrontier

Fri 12/191:40 pmORD - BWI

Nonstop2h 07mFrontier

Deal found 12/1

$128

Mon 12/158:37 amBWI - MDW

1 stop14h 21mFrontier

Wed 12/172:49 pmMDW - BWI

1 stop8h 35mFrontier

Deal found 12/2

$129

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 3, 2025.

Thu 1/87:45 amBWI - MDW

Nonstop2h 20mSouthwest

Mon 1/129:50 amMDW - BWI

Nonstop1h 50mSouthwest

Deal found 12/2

$105

Sat 2/216:20 amBWI - ORD

Nonstop2h 23mUnited Airlines

Sat 2/286:25 pmORD - BWI

Nonstop2h 02mUnited Airlines

Deal found 12/2

$105

Fri 1/3011:38 amBWI - ORD

1 stop12h 45mFrontier

Sat 1/319:15 amORD - BWI

1 stop8h 35mFrontier

Deal found 12/2

$124

Sat 12/1310:40 amBWI - ORD

1 stop12h 08mMultiple Airlines

Sun 12/145:11 amORD - BWI

Nonstop2h 07mMultiple Airlines

Deal found 12/2

$143

Thu 1/229:54 amDCA - ORD

1 stop4h 24mDelta

Wed 2/2510:45 amORD - DCA

1 stop4h 31mDelta

Deal found 12/2

$177

Sat 1/1012:20 pmDCA - ORD

1 stop6h 23mJetBlue

Sat 1/177:45 amORD - DCA

1 stop5h 44mJetBlue

Deal found 12/1

$197

Mon 1/1210:05 amBWI - ORD

Nonstop2h 20mUnited Airlines

Mon 1/126:15 pmORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/2

$105

Thu 1/86:40 amBWI - ORD

1 stop7h 20mSouthwest

Mon 1/121:45 pmORD - BWI

1 stop6h 10mSouthwest

Deal found 12/2

$125

Fri 2/276:30 amBWI - ORD

Nonstop2h 23mUnited Airlines

Mon 3/26:25 pmORD - BWI

Nonstop2h 02mUnited Airlines

Deal found 12/2

$116

Thu 2/268:58 amBWI - ORD

Nonstop2h 24mFrontier

Tue 3/34:45 pmORD - BWI

2 stops16h 38mFrontier

Deal found 12/2

$132

Thu 1/111:20 amBWI - MDW

1 stop3h 45mSouthwest

Thu 1/81:15 pmMDW - BWI

Nonstop1h 45mSouthwest

Deal found 12/2

$128

Thu 2/126:15 amIAD - MLI

1 stop7h 00mAmerican Airlines

Sun 2/1511:05 amMLI - IAD

1 stop6h 11mAmerican Airlines

Deal found 12/1

$294

Thu 1/16:15 amBWI - ORD

Nonstop2h 20mUnited Airlines

Thu 1/811:05 amORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/2

$122

Thu 1/86:00 amIAD - MDW

1 stop6h 31mFrontier

Sun 1/119:15 amMDW - IAD

1 stop10h 41mFrontier

Deal found 12/3

$143

Fri 2/66:15 amBWI - ORD

1 stop7h 00mSouthwest

Mon 2/92:15 pmORD - BWI

1 stop8h 25mSouthwest

Deal found 12/1

$136

Thu 1/812:55 pmDCA - ORD

1 stop5h 31mDelta

Mon 1/121:55 pmORD - DCA

1 stop3h 47mDelta

Deal found 12/2

$177

Sat 1/175:18 pmBWI - ORD

Nonstop2h 20mUnited Airlines

Sun 1/1811:05 amORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 11/30

$139

Thu 1/111:55 amBWI - ORD

1 stop7h 38mFrontier

Thu 1/84:20 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/2

$156

Fri 1/309:54 amDCA - ORD

1 stop4h 24mDelta

Sat 1/315:30 amORD - DCA

1 stop4h 50mDelta

Deal found 12/2

$177

Wed 1/286:00 amDCA - ORD

1 stop8h 00mSouthwest

Wed 2/111:45 pmORD - DCA

1 stop7h 15mSouthwest

Deal found 12/2

$151

Thu 1/81:02 pmBWI - STL

1 stop10h 31mFrontier

Mon 1/125:11 pmSTL - BWI

1 stop28h 25mFrontier

Deal found 12/3

$158

Wed 2/1110:05 amBWI - ORD

Nonstop2h 20mUnited Airlines

Sun 2/156:25 pmORD - BWI

Nonstop2h 02mUnited Airlines

Deal found 12/2

$144

Thu 1/229:54 amDCA - ORD

1 stop4h 24mDelta

Mon 1/269:35 amORD - DCA

1 stop5h 44mDelta

Deal found 12/2

$177

Thu 1/157:40 amBWI - MDW

Nonstop2h 20mSouthwest

Sun 1/186:50 amMDW - BWI

Nonstop1h 55mSouthwest

Deal found 12/2

$152

Tue 1/136:00 amIAD - ORD

1 stop4h 41mDelta

Wed 1/146:50 amORD - IAD

1 stop3h 59mDelta

Deal found 12/2

$177

Sat 1/173:45 pmBWI - MDW

Nonstop2h 10mSouthwest

Sun 1/186:50 amMDW - BWI

Nonstop1h 55mSouthwest

Deal found 12/2

$152

Fri 1/2310:30 amDCA - ORD

Nonstop2h 16mUnited Airlines

Sun 1/259:02 amORD - DCA

1 stop4h 37mUnited Airlines

Deal found 12/1

$155

Sun 2/19:18 amIAD - MDW

2 stops14h 01mFrontier

Sun 2/156:00 amMDW - IAD

1 stop9h 32mFrontier

Deal found 12/3

$175

Fri 1/306:00 amIAD - ORD

1 stop5h 05mDelta

Sat 1/316:50 amORD - IAD

1 stop3h 59mDelta

Deal found 12/2

$177

Fri 1/3012:32 pmIAD - ORD

1 stop7h 13mDelta

Mon 2/27:05 amORD - IAD

1 stop6h 40mDelta

Deal found 12/2

$177

Last-minute flights from Washington, D.C. to Illinois
Discover last-minute flight deals from Washington, D.C. to Illinois. Data last updated December 3, 2025 and is based on user searches.

Mon 12/83:36 pmBWI - ORD

Nonstop2h 18mFrontier

Sun 12/145:11 amORD - BWI

Nonstop2h 07mFrontier

Deal found 12/1

$107

Wed 12/108:00 amBWI - ORD

1 stop7h 31mFrontier

Sun 12/145:11 amORD - BWI

Nonstop2h 07mFrontier

Deal found 12/2

$109

Tue 1/66:18 pmBWI - ORD

1 stop27h 41mMultiple Airlines

Thu 1/84:20 pmORD - BWI

Nonstop2h 02mMultiple Airlines

Deal found 12/1

$108

Wed 1/78:38 pmBWI - ORD

Nonstop2h 10mMultiple Airlines

Sat 1/105:50 amORD - BWI

1 stop6h 00mMultiple Airlines

Deal found 12/1

$103

Thu 1/81:45 pmBWI - MDW

Nonstop2h 10mSouthwest

Thu 1/85:15 pmMDW - BWI

Nonstop1h 55mSouthwest

Deal found 12/2

$105

Thu 1/88:07 pmBWI - ORD

Nonstop2h 24mMultiple Airlines

Mon 1/1212:44 pmORD - BWI

1 stop10h 03mMultiple Airlines

Deal found 12/2

$106

Fri 1/98:17 pmBWI - ORD

Nonstop2h 24mMultiple Airlines

Sun 1/117:30 amORD - BWI

1 stop24h 01mMultiple Airlines

Deal found 12/2

$104

Fri 1/98:17 pmBWI - ORD

Nonstop2h 24mFrontier

Sun 1/114:20 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/2

$105

Sat 1/1011:30 amBWI - ORD

1 stop7h 22mMultiple Airlines

Sun 1/183:50 pmORD - BWI

Nonstop2h 00mMultiple Airlines

Deal found 12/3

$99

Sun 1/118:06 amBWI - ORD

1 stop8h 22mFrontier

Thu 1/157:35 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/3

$101

Tue 1/1311:30 amBWI - ORD

1 stop7h 22mSpirit Airlines

Wed 1/1410:48 amORD - BWI

1 stop11h 59mSpirit Airlines

Deal found 12/2

$102

Wed 1/217:10 amBWI - MDW

1 stop5h 55mFrontier

Mon 1/261:00 pmMDW - BWI

1 stop27h 10mFrontier

Deal found 12/1

$110

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 3, 2025.

Wed 1/218:00 amBWI - STL

1 stop16h 33mFrontier

Deal found 12/1

$50

Tue 1/278:00 amBWI - STL

1 stop16h 33mFrontier

Deal found 12/2

$52

Tue 2/38:00 amBWI - STL

1 stop16h 33mFrontier

Deal found 12/1

$54

Fri 1/309:35 amIAD - STL

1 stop14h 58mFrontier

Deal found 12/1

$56

Fri 2/203:37 pmIAD - STL

1 stop7h 56mFrontier

Deal found 12/2

$57

Tue 1/2711:30 amBWI - STL

1 stop13h 03mMultiple Airlines

Deal found 12/3

$61

Fri 1/169:13 pmDCA - ORD

Nonstop2h 21mAmerican Airlines

Deal found 12/3

$64

Fri 1/308:20 amIAD - ORD

Nonstop2h 23mUnited Airlines

Deal found 12/3

$64

Fri 1/304:01 pmBWI - STL

1 stop8h 32mFrontier

Deal found 12/3

$64

Sat 1/248:00 amDCA - STL

1 stop7h 46mFrontier

Deal found 12/3

$64

Fri 2/276:42 pmBWI - ORD

1 stop5h 53mFrontier

Deal found 12/3

$64

Thu 1/296:00 amBWI - ORD

1 stop8h 37mFrontier

Deal found 12/3

$65

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

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$98 (American Airlines)
One-way from	$50 (Trip.com)
Popular in	November
Cheapest in	September
Average price	$264
Good round-trip deal	$167 or less
Good one-way deal	$97 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. 5% potential increase in price ($14 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 - MDW

BWIMDW

Baltimore/Washington

Thu 1/8

7:45 am-9:05 am

Nonstop2h 20m

Chicago Midway

Mon 1/12

9:50 am-12:40 pm

Nonstop1h 50m

$105

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Sat 2/21

6:20 am-7:43 am

Nonstop2h 23m

Chicago O'Hare Intl

Sat 2/28

6:25 pm-9:27 pm

Nonstop2h 02m

$105

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Mon 1/12

10:05 am-11:25 am

Nonstop2h 20m

Chicago O'Hare Intl

Mon 1/12

6:15 pm-9:21 pm

Nonstop2h 06m

$105

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Fri 2/27

6:30 am-7:53 am

Nonstop2h 23m

Chicago O'Hare Intl

Mon 3/2

6:25 pm-9:27 pm

Nonstop2h 02m

$116

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/1

6:15 am-7:35 am

Nonstop2h 20m

Chicago O'Hare Intl

Thu 1/8

11:05 am-2:11 pm

Nonstop2h 06m

$122

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Fri 1/30

11:38 am-11:23 pm

1 stop12h 45m

Chicago O'Hare Intl

Sat 1/31

9:15 am-6:50 pm

1 stop8h 35m

$124

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/8

6:40 am-1:00 pm

1 stop7h 20m

Chicago O'Hare Intl

Mon 1/12

1:45 pm-8:55 pm

1 stop6h 10m

$125

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Thu 1/1

11:20 am-2:05 pm

1 stop3h 45m

Chicago Midway

Thu 1/8

1:15 pm-4:00 pm

Nonstop1h 45m

$128

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 2/26

8:58 am-10:22 am

Nonstop2h 24m

Chicago O'Hare Intl

Tue 3/3

4:45 pm-10:23 am

2 stops16h 38m

$132

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Fri 2/6

6:15 am-12:15 pm

1 stop7h 00m

Chicago O'Hare Intl

Mon 2/9

2:15 pm-11:40 pm

1 stop8h 25m

$136

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

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 $50). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $132). 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 34% 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.

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

The most flights from WAS to USIL are scheduled on a Wednesday (67 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (36 on average).

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

8.0

Very good

4,253 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

8.0

Very good

4,253 reviews

Southwest

8.0

Very good

4,253 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

9,063 reviews

Southwest

8.0

Very good

4,253 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

11,045 reviews

Southwest

8.0

Very good

4,253 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

8,156 reviews

Southwest

8.0

Very good

4,253 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

3,094 reviews

Southwest

8.0

Very good

4,253 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. Southwest provides one of the quickest options available for as low as $105. The distance from Washington, D.C. to Illinois is about 609 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 Washington, D.C. Dulles Intl - Chicago O'Hare Intl or Washington, D.C. Reagan-National - 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 Air China (91%), Egyptair (89%) and ANA (84%).
What are the cheapest flights from Washington, D.C. to Illinois?
On average you can expect to pay $932 for a flight from Washington, D.C. to Illinois. The cheapest flight overall is $109 while the most popular route, (Baltimore/Washington - Chicago O'Hare Intl) is currently priced at $75.
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 $50). Flying from Washington, D.C. to Illinois in June is currently the most expensive (average of $132). 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$64	Average$176	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$98	Average$385	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$131	Average$364	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$150	Average$296	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$154	Average$419	FlexibilityNo cancel fee	On-time71%

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$50+ 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 1/21. 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 3, 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 3, 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 3, 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.

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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 3, 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.

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

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 3, 2025.