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

A quick flight from Washington, D.C. to Illinois can take about 2h 10m. Frontier provides one of the quickest options available for as low as $139. 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 Baltimore/Washington - 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 $1,046 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 $185.

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.

$61+ Flights from Washington, D.C. to Illinois

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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 25, 2025.

Wed 12/316:00 amBWI - MDW

1 stop3h 49mDelta

Thu 1/16:08 pmMDW - BWI

1 stop4h 23mDelta

Deal found 12/23

$177

Wed 12/316:00 amBWI - ORD

1 stop4h 01mDelta

Thu 1/16:35 amORD - BWI

1 stop6h 16mDelta

Deal found 12/23

$177

Wed 12/3111:55 amBWI - MDW

1 stop11h 17mFrontier

Wed 1/75:10 pmMDW - BWI

1 stop6h 19mFrontier

Deal found 12/23

$209

Wed 12/314:49 pmBWI - MDW

1 stop6h 33mDelta

Tue 1/66:14 pmMDW - BWI

1 stop3h 51mDelta

Deal found 12/23

$213

Wed 12/316:00 amBWI - ORD

1 stop4h 01mDelta

Tue 1/62:50 pmORD - BWI

1 stop4h 38mDelta

Deal found 12/23

$213

Tue 12/309:37 amBWI - ORD

Nonstop2h 18mFrontier

Wed 1/74:49 pmORD - BWI

1 stop6h 40mFrontier

Deal found 12/23

$221

Wed 12/316:00 amDCA - ORD

Nonstop2h 30mAmerican Airlines

Thu 1/18:00 amORD - DCA

Nonstop1h 56mAmerican Airlines

Deal found 12/24

$223

Wed 12/3112:40 pmBWI - MDW

1 stop5h 15mSouthwest

Thu 1/12:30 pmMDW - BWI

1 stop4h 10mSouthwest

Deal found 12/24

$224

Tue 12/309:37 amBWI - ORD

Nonstop2h 18mMultiple Airlines

Thu 1/112:09 pmORD - BWI

1 stop10h 40mMultiple Airlines

Deal found 12/23

$228

Wed 12/313:55 pmBWI - ORD

1 stop6h 55mSouthwest

Thu 1/11:45 pmORD - BWI

1 stop6h 30mSouthwest

Deal found 12/24

$229

Tue 12/305:37 pmIAD - ORD

1 stop5h 47mFrontier

Wed 1/75:50 amORD - IAD

1 stop10h 00mFrontier

Deal found 12/23

$232

Tue 12/3011:55 amBWI - MDW

1 stop11h 17mFrontier

Wed 1/75:10 pmMDW - BWI

1 stop6h 19mFrontier

Deal found 12/23

$232

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 25, 2025.

Thu 1/88:07 pmBWI - ORD

Nonstop2h 24mFrontier

Mon 1/124:20 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/25

$100

Thu 1/2212:05 pmBWI - ORD

Nonstop2h 27mMultiple Airlines

Mon 1/268:43 pmORD - BWI

2 stops26h 38mMultiple Airlines

Deal found 12/25

$135

Sat 1/245:50 pmBWI - MDW

Nonstop2h 10mSouthwest

Sat 1/315:40 pmMDW - BWI

Nonstop1h 50mSouthwest

Deal found 12/25

$139

Thu 1/16:15 amBWI - ORD

Nonstop2h 20mUnited Airlines

Thu 1/12:00 pmORD - BWI

Nonstop1h 58mUnited Airlines

Deal found 12/25

$139

Fri 2/276:43 amBWI - ORD

Nonstop2h 42mAmerican Airlines

Mon 3/28:31 amORD - BWI

Nonstop1h 58mAmerican Airlines

Deal found 12/24

$158

Tue 1/2011:55 amDCA - ORD

1 stop6h 48mJetBlue

Tue 1/277:45 amORD - DCA

1 stop5h 44mJetBlue

Deal found 12/23

$197

Thu 1/158:08 amBWI - ORD

1 stop12h 00mFrontier

Sun 1/183:50 pmORD - BWI

Nonstop2h 00mFrontier

Deal found 12/24

$110

Mon 1/2611:24 amBWI - ORD

1 stop12h 22mFrontier

Fri 1/306:05 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/25

$114

Tue 1/275:26 pmIAD - ORD

1 stop4h 39mDelta

Wed 1/286:50 amORD - IAD

1 stop4h 02mDelta

Deal found 12/25

$251

Sat 2/1412:10 pmBWI - MDW

Nonstop2h 10mSouthwest

Mon 2/169:30 amMDW - BWI

Nonstop1h 45mSouthwest

Deal found 12/23

$139

Wed 1/285:18 pmBWI - ORD

Nonstop2h 20mUnited Airlines

Mon 2/26:15 pmORD - BWI

Nonstop2h 06mUnited Airlines

Deal found 12/25

$139

Fri 1/161:00 pmBWI - ORD

1 stop7h 38mMultiple Airlines

Mon 1/196:00 amORD - BWI

Nonstop2h 00mMultiple Airlines

Deal found 12/25

$144

Thu 1/88:07 pmBWI - ORD

Nonstop2h 24mFrontier

Sun 1/114:20 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/25

$125

Sat 1/245:50 pmBWI - MDW

Nonstop2h 10mSouthwest

Tue 1/279:50 amMDW - BWI

Nonstop1h 50mSouthwest

Deal found 12/25

$139

Thu 2/127:35 amBWI - MDW

Nonstop2h 15mSouthwest

Sat 2/142:10 pmMDW - BWI

Nonstop1h 45mSouthwest

Deal found 12/22

$139

Thu 2/54:44 pmBWI - STL

1 stop7h 49mMultiple Airlines

Tue 2/173:49 pmSTL - BWI

1 stop18h 28mMultiple Airlines

Deal found 12/25

$168

Wed 1/288:00 amBWI - ORD

1 stop27h 41mFrontier

Mon 2/211:51 amORD - BWI

1 stop9h 50mFrontier

Deal found 12/25

$145

Thu 1/2910:05 amDCA - ORD

1 stop8h 38mJetBlue

Tue 2/37:45 amORD - DCA

1 stop5h 44mJetBlue

Deal found 12/23

$197

Thu 1/157:40 amBWI - MDW

Nonstop2h 20mSouthwest

Sun 1/189:50 amMDW - BWI

Nonstop1h 50mSouthwest

Deal found 12/23

$149

Fri 2/274:45 pmBWI - STL

1 stop8h 42mMultiple Airlines

Mon 3/28:22 pmSTL - BWI

1 stop19h 51mMultiple Airlines

Deal found 12/23

$175

Sat 2/711:55 amDCA - ORD

1 stop6h 49mJetBlue

Mon 2/97:45 amORD - DCA

1 stop5h 49mJetBlue

Deal found 12/23

$197

Sun 1/118:17 pmBWI - ORD

Nonstop2h 24mFrontier

Mon 1/124:49 pmORD - BWI

1 stop6h 40mFrontier

Deal found 12/25

$155

Thu 2/127:35 amBWI - MDW

Nonstop2h 15mSouthwest

Sun 2/156:50 amMDW - BWI

Nonstop1h 55mSouthwest

Deal found 12/22

$158

Sat 1/2412:20 pmDCA - ORD

1 stop6h 23mJetBlue

Sun 1/257:45 amORD - DCA

1 stop5h 44mJetBlue

Deal found 12/23

$197

Tue 1/139:00 amIAD - ORD

1 stop5h 40mDelta

Tue 2/109:55 amORD - IAD

1 stop7h 26mDelta

Deal found 12/23

$251

Sat 1/245:50 pmBWI - MDW

Nonstop2h 10mSouthwest

Sun 1/257:05 amMDW - BWI

Nonstop1h 55mSouthwest

Deal found 12/24

$158

Fri 1/2310:05 amDCA - ORD

1 stop8h 38mJetBlue

Sun 1/257:45 amORD - DCA

1 stop5h 44mJetBlue

Deal found 12/23

$197

Thu 1/159:58 pmBWI - STL

1 stop10h 56mFrontier

Thu 1/225:42 pmSTL - BWI

1 stop20h 24mFrontier

Deal found 12/25

$163

Sat 1/173:30 pmDCA - STL

Nonstop2h 31mAmerican Airlines

Mon 1/196:00 amSTL - DCA

Nonstop2h 19mAmerican Airlines

Deal found 12/24

$263

Thu 1/298:08 pmBWI - STL

2 stops40h 03mMultiple Airlines

Sun 2/85:42 pmSTL - BWI

1 stop17h 28mMultiple Airlines

Deal found 12/25

$203

Last-minute flights from Washington, D.C. to Illinois
Discover last-minute flight deals from Washington, D.C. to Illinois. Data last updated December 25, 2025 and is based on user searches.

Wed 1/78:38 pmBWI - ORD

Nonstop2h 10mMultiple Airlines

Thu 1/84:20 pmORD - BWI

Nonstop2h 02mMultiple Airlines

Deal found 12/24

$98

Wed 1/711:45 amBWI - ORD

1 stop11h 54mFrontier

Mon 1/1212:48 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/22

$100

Thu 1/88:07 pmBWI - ORD

Nonstop2h 24mFrontier

Mon 1/124:20 pmORD - BWI

Nonstop2h 02mFrontier

Deal found 12/25

$101

Wed 1/141:00 pmBWI - ORD

1 stop11h 46mMultiple Airlines

Sun 1/183:50 pmORD - BWI

Nonstop2h 00mMultiple Airlines

Deal found 12/23

$103

Fri 1/161:55 pmBWI - ORD

Nonstop2h 27mFrontier

Sun 1/187:35 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/25

$83

Fri 1/161:55 pmBWI - ORD

Nonstop2h 27mFrontier

Thu 1/228:10 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/25

$84

Wed 1/218:00 amBWI - ORD

1 stop27h 41mFrontier

Fri 1/236:05 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/25

$97

Sat 1/247:45 pmBWI - ORD

1 stop29h 14mFrontier

Mon 1/268:45 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/24

$94

Tue 1/277:10 amBWI - ORD

1 stop7h 48mFrontier

Fri 1/306:05 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/23

$96

Thu 1/2912:05 pmBWI - ORD

Nonstop2h 27mFrontier

Mon 2/28:45 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/22

$88

Thu 1/2912:05 pmBWI - ORD

Nonstop2h 27mFrontier

Sat 1/319:15 amORD - BWI

1 stop8h 35mFrontier

Deal found 12/23

$93

Fri 1/3010:00 amBWI - ORD

Nonstop2h 27mFrontier

Mon 2/28:45 amORD - BWI

Nonstop2h 00mFrontier

Deal found 12/24

$91

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 25, 2025.

Tue 1/138:00 amBWI - STL

1 stop15h 34mFrontier

Deal found 12/23

$61

Sat 2/76:15 pmBWI - STL

1 stop6h 18mFrontier

Deal found 12/25

$64

Sat 1/248:00 amDCA - STL

1 stop7h 46mFrontier

Deal found 12/25

$64

Tue 3/36:00 amBWI - STL

1 stop25h 51mFrontier

Deal found 12/23

$66

Wed 1/288:00 amBWI - STL

1 stop16h 33mFrontier

Deal found 12/25

$68

Sat 1/175:30 amBWI - ORD

1 stop18h 14mFrontier

Deal found 12/23

$68

Mon 1/1910:08 pmIAD - ORD

1 stop16h 49mFrontier

Deal found 12/22

$69

Tue 1/278:00 amBWI - STL

1 stop16h 33mFrontier

Deal found 12/23

$69

Tue 2/107:54 pmBWI - ORD

1 stop20h 58mFrontier

Deal found 12/23

$69

Wed 1/282:00 pmDCA - ORD

1 stop29h 31mFrontier

Deal found 12/24

$70

Mon 1/128:35 amIAD - STL

1 stop14h 58mFrontier

Deal found 12/23

$70

Sat 1/3111:39 amIAD - ORD

1 stop12h 05mFrontier

Deal found 12/25

$70

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

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$83 (Frontier)
One-way from	$61 (Trip.com)
Popular in	November
Cheapest in	September
Average price	$278
Good round-trip deal	$167 or less
Good one-way deal	$127 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 - ORD

BWIORD

Baltimore/Washington

Thu 1/8

8:07 pm-9:31 pm

Nonstop2h 24m

Chicago O'Hare Intl

Mon 1/12

4:20 pm-7:22 pm

Nonstop2h 02m

$100

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/15

8:08 am-7:08 pm

1 stop12h 00m

Chicago O'Hare Intl

Sun 1/18

3:50 pm-6:50 pm

Nonstop2h 00m

$110

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Mon 1/26

11:24 am-10:46 pm

1 stop12h 22m

Chicago O'Hare Intl

Fri 1/30

6:05 am-9:05 am

Nonstop2h 00m

$114

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/8

8:07 pm-9:31 pm

Nonstop2h 24m

Chicago O'Hare Intl

Sun 1/11

4:20 pm-7:22 pm

Nonstop2h 02m

$125

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/22

12:05 pm-1:32 pm

Nonstop2h 27m

Chicago O'Hare Intl

Mon 1/26

8:43 pm-12:21 am

2 stops26h 38m

$135

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Sat 1/24

5:50 pm-7:00 pm

Nonstop2h 10m

Chicago Midway

Sat 1/31

5:40 pm-8:30 pm

Nonstop1h 50m

$139

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Thu 1/1

6:15 am-7:35 am

Nonstop2h 20m

Chicago O'Hare Intl

Thu 1/1

2:00 pm-4:58 pm

Nonstop1h 58m

$139

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Sat 2/14

12:10 pm-1:20 pm

Nonstop2h 10m

Chicago Midway

Mon 2/16

9:30 am-12:15 pm

Nonstop1h 45m

$139

BaltimoreChicago

BWI - ORD

BWIORD

Baltimore/Washington

Wed 1/28

5:18 pm-6:38 pm

Nonstop2h 20m

Chicago O'Hare Intl

Mon 2/2

6:15 pm-9:21 pm

Nonstop2h 06m

$139

BaltimoreChicago

BWI - MDW

BWIMDW

Baltimore/Washington

Sat 1/24

5:50 pm-7:00 pm

Nonstop2h 10m

Chicago Midway

Tue 1/27

9:50 am-12:40 pm

Nonstop1h 50m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/24

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 $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 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 Thursday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (35 on average).

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

4,258 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

4,258 reviews

Southwest

8.0

Very good

4,258 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

9,115 reviews

Southwest

8.0

Very good

4,258 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

11,062 reviews

Southwest

8.0

Very good

4,258 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

8,204 reviews

Southwest

8.0

Very good

4,258 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

3,070 reviews

Southwest

8.0

Very good

4,258 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 10m. Frontier provides one of the quickest options available for as low as $139. 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 Baltimore/Washington - 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 $1,046 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 $185.
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 $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$179	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$131	Average$355	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$148	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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$61+ 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 1/13. 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 25, 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 25, 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 25, 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 25, 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

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 25, 2025.