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

Airlines like Southwest, United Airlines, and Frontier fly from Illinois to Washington, D.C. in about 1h 50m. The time it takes to get you to your destination can typically vary by up to 9h 43m. The distance between Illinois and Washington, D.C. is about 599 mi. This flight may include one or multiple stops.

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

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $33. However, be on the lookout for offers from American Airlines and Southwest, as they are both options that can get you from Illinois to Washington, D.C. for a low price.

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C., 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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

Most travelers choose Chicago O'Hare Intl - Washington, D.C. Reagan-National, Chicago O'Hare Intl - Baltimore/Washington or Chicago O'Hare Intl - Washington, D.C. Dulles Intl when deciding on the best route from Illinois to Washington, D.C..

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

On average you can expect to pay $1,120 for a flight from Illinois to Washington, D.C.. The cheapest flight overall is $160 while the most popular route, (Chicago O'Hare Intl - Washington, D.C. Reagan-National) is currently priced at $208.

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to Washington, D.C. on time: Air China (94%), Avianca (93%), Copa Airlines (85%).

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

When booking a flight from Illinois to Washington, D.C., you may want to consider flying on United Airlines, American Airlines or Southwest as they are the most popular for this route.

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

Yes. In addition to deals on Illinois to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.

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

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Washington, D.C..

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

Yes. Cheapflights offers flight deals from Illinois to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$121+ Cheap Flights from Illinois to Washington, D.C.

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

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Last-minute

One-way

Cheapest flights from Illinois to Washington, D.C.
Explore the most affordable flight options available from Illinois to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 4, 2026.

Thu 12/38:30 am -

1 stop5h 18m

Mon 12/73:08 pm -

1 stop8h 06m

Deal found 10/31

$197

Tue 12/87:25 am -

1 stop13h 34m

Wed 12/97:00 am -

1 stop18h 54m

Deal found 11/2

$198

Sun 12/138:30 am -

1 stop5h 19m

Tue 12/1512:06 pm -

1 stop10h 54m

Deal found 11/1

$198

Wed 12/168:30 am -

1 stop5h 19m

Sun 1/176:37 am -

1 stop6h 13m

Deal found 11/1

$199

Tue 12/17:00 am -

1 stop13h 55m

Wed 12/27:00 am -

1 stop18h 53m

Deal found 11/1

$200

Tue 11/249:09 am -

1 stop4h 54m

Tue 12/16:40 am -

1 stop5h 53m

Deal found 11/1

$200

Wed 11/189:51 am -

1 stop23h 30m

Sat 12/510:35 pm -

1 stop9h 45m

Deal found 11/2

$200

Sat 11/217:49 am -

1 stop6h 14m

Wed 12/212:06 pm -

1 stop10h 29m

Deal found 11/1

$201

Sat 12/57:25 am -

1 stop13h 34m

Sat 12/121:40 pm -

1 stop12h 14m

Deal found 11/2

$202

Wed 12/28:15 am -

1 stop5h 34m

Tue 12/83:34 pm -

2 stops25h 59m

Deal found 10/31

$202

Mon 12/75:02 pm -

1 stop17h 09m

Wed 12/910:35 pm -

1 stop18h 31m

Deal found 11/2

$203

Sat 12/57:25 am -

1 stop8h 30m

Tue 12/86:00 pm -

1 stop7h 54m

Deal found 11/2

$204

Best flights from Illinois to Washington, D.C.
Discover carefully curated flight deals from Illinois to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 4, 2026.

Thu 12/37:25 am -

Nonstop1h 50m

Mon 12/711:00 am -

Nonstop2h 05m

Deal found 11/2

$277

Wed 12/239:35 pm -

Nonstop2h 03m

Tue 12/291:05 pm -

Nonstop2h 24m

Deal found 10/30

$277

Fri 11/208:28 am -

1 stop11h 33m

Tue 11/246:50 am -

1 stop6h 31m

Deal found 11/4

$278

Sat 11/216:20 am -

1 stop16h 20m

Tue 11/246:10 am -

1 stop5h 29m

Deal found 10/30

$280

Wed 12/25:44 am -

1 stop5h 10m

Tue 12/87:58 pm -

1 stop5h 05m

Deal found 10/31

$281

Wed 12/912:05 pm -

Nonstop1h 50m

Fri 12/116:10 am -

Nonstop2h 05m

Deal found 11/2

$277

Tue 12/110:35 am -

Nonstop2h 03m

Sat 12/510:15 pm -

Nonstop2h 14m

Deal found 11/2

$277

Thu 11/2611:05 am -

1 stop9h 55m

Wed 12/29:45 am -

1 stop4h 16m

Deal found 10/31

$280

Fri 1/156:00 am -

Nonstop1h 55m

Tue 1/192:35 pm -

Nonstop2h 10m

Deal found 11/4

$277

Sat 12/58:52 am -

Nonstop2h 01m

Sat 12/510:15 pm -

Nonstop2h 14m

Deal found 10/31

$277

Sat 12/54:29 pm -

1 stop6h 13m

Sat 12/126:00 am -

1 stop6h 24m

Deal found 11/3

$281

Wed 12/25:53 am -

1 stop7h 06m

Sun 12/612:59 pm -

1 stop4h 32m

Deal found 11/1

$315

Wed 11/186:08 am -

1 stop10h 04m

Mon 11/306:50 am -

1 stop6h 31m

Deal found 11/4

$335

Fri 12/45:14 pm -

1 stop4h 21m

Tue 12/85:00 am -

2 stops6h 56m

Deal found 10/30

$320

Tue 1/510:20 am -

2 stops7h 30m

Wed 1/612:05 pm -

Nonstop2h 05m

Deal found 11/1

$292

Tue 12/13:59 pm -

1 stop4h 44m

Wed 12/212:30 pm -

1 stop4h 47m

Deal found 11/1

$297

Tue 11/2410:40 am -

1 stop5h 44m

Tue 12/13:37 pm -

1 stop6h 26m

Deal found 10/30

$315

Tue 12/295:25 am -

1 stop6h 23m

Fri 1/15:33 pm -

1 stop3h 45m

Deal found 10/31

$297

Thu 12/249:55 am -

1 stop7h 10m

Tue 12/299:00 pm -

Nonstop2h 05m

Deal found 11/3

$297

Thu 12/245:00 am -

1 stop5h 54m

Mon 12/288:06 pm -

1 stop5h 10m

Deal found 10/30

$339

Fri 12/46:42 am -

1 stop5h 23m

Tue 12/87:05 pm -

1 stop4h 54m

Deal found 10/30

$315

Fri 12/256:15 pm -

1 stop4h 04m

Fri 1/16:00 am -

1 stop3h 49m

Deal found 11/3

$297

Sun 12/132:10 pm -

Nonstop1h 45m

Tue 12/151:00 pm -

Nonstop2h 15m

Deal found 11/1

$318

Thu 12/178:52 am -

Nonstop2h 02m

Sun 12/206:10 am -

Nonstop2h 22m

Deal found 10/31

$318

Tue 12/15:11 am -

1 stop4h 41m

Tue 12/86:25 pm -

1 stop6h 57m

Deal found 11/3

$355

Wed 11/256:44 pm -

1 stop3h 42m

Tue 12/17:59 am -

1 stop5h 05m

Deal found 10/31

$297

Sat 12/59:35 pm -

Nonstop1h 49m

Sun 12/610:15 pm -

Nonstop2h 14m

Deal found 10/31

$318

Mon 12/211:46 pm -

1 stop6h 40m

Mon 1/47:51 am -

1 stop6h 25m

Deal found 10/31

$359

Sat 11/216:44 pm -

1 stop3h 37m

Mon 11/236:00 am -

1 stop5h 24m

Deal found 10/31

$297

Wed 11/253:05 pm -

2 stops6h 50m

Fri 11/2710:45 am -

Nonstop2h 05m

Deal found 11/3

$333

Last-minute flights from Illinois to Washington, D.C.
Discover last-minute flight deals from Illinois to Washington, D.C.. Data last updated November 4, 2026 and is based on user searches.

Wed 11/189:51 am -

1 stop23h 30m

Sat 12/510:35 pm -

1 stop9h 45m

Deal found 11/2

$200

Sat 11/217:49 am -

1 stop6h 14m

Wed 12/212:06 pm -

1 stop10h 29m

Deal found 11/1

$201

Tue 11/249:09 am -

1 stop4h 54m

Tue 12/16:40 am -

1 stop5h 53m

Deal found 11/1

$200

Tue 12/17:00 am -

1 stop13h 55m

Wed 12/27:00 am -

1 stop18h 53m

Deal found 11/1

$200

Wed 12/28:15 am -

1 stop5h 34m

Tue 12/83:34 pm -

2 stops25h 59m

Deal found 10/31

$202

Thu 12/38:30 am -

1 stop5h 18m

Mon 12/73:08 pm -

1 stop8h 06m

Deal found 10/31

$197

Sat 12/57:25 am -

1 stop13h 34m

Sat 12/121:40 pm -

1 stop12h 14m

Deal found 11/2

$202

Sat 12/57:25 am -

1 stop8h 30m

Tue 12/86:00 pm -

1 stop7h 54m

Deal found 11/2

$204

Mon 12/75:02 pm -

1 stop17h 09m

Wed 12/910:35 pm -

1 stop18h 31m

Deal found 11/2

$203

Tue 12/87:25 am -

1 stop13h 34m

Wed 12/97:00 am -

1 stop18h 54m

Deal found 11/2

$198

Sun 12/138:30 am -

1 stop5h 19m

Tue 12/1512:06 pm -

1 stop10h 54m

Deal found 11/1

$198

Wed 12/168:30 am -

1 stop5h 19m

Sun 1/176:37 am -

1 stop6h 13m

Deal found 11/1

$199

One-way flights from Illinois to Washington, D.C.
Search for one-way flight options from Illinois to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated November 4, 2026.

Thu 12/177:00 am -

1 stop13h 59m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/4

$121

Wed 12/238:35 pm -

1 stop23h 36m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/4

$121

Thu 11/269:09 am -

1 stop4h 54m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/4

$122

Fri 1/226:21 am -

1 stop29h 04m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/4

$123

Tue 11/249:09 am -

1 stop4h 54m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/3

$123

Wed 11/186:30 am -

1 stop28h 39m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/2

$124

Tue 11/176:08 am -

1 stop10h 04m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/2

$124

Tue 11/179:51 am -

1 stop23h 30m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/1

$124

Mon 1/47:05 am -

1 stop13h 54m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/31

$125

Fri 12/188:35 pm -

1 stop23h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/1

$125

Wed 12/305:58 am -

1 stop17h 53m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/1

$125

Wed 11/186:08 am -

1 stop10h 04m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 11/1

$126

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

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$197 (Kiwi.com)
One-way from	$121 (Cheapflightsfares)
Popular in	June
Cheapest in	January
Average price	$326
Good round-trip deal	$243 or less
Good one-way deal	$141 or less

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

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

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

Search Deals

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

Search Deals

Highest demand for flights based on searches. 12% potential increase in price ($45 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in November 2026

Search Deals

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

Search Deals

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

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Wed 11/18

6:08 am-5:12 pm

1 stop10h 04m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$128

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Sun 11/22

9:09 am-3:03 pm

1 stop4h 54m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$138

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Tue 11/24

9:09 am-3:03 pm

1 stop4h 54m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$138

ChicagoWashington, D.C.

ORD Chicago O'Hare Intl - DCA Washington, D.C. Reagan-National

ORDDCA

Chicago O'Hare Intl

Fri 1/22

6:00 pm-9:05 pm

Nonstop2h 05m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$139

Quickest round-trip

ChicagoWashington, D.C.

MDW Chicago Midway - DCA Washington, D.C. Reagan-National

MDWDCA

Chicago Midway

Tue 11/24

8:55 pm-11:40 pm

Nonstop1h 45m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$139

ChicagoWashington, D.C.

ORD Chicago O'Hare Intl - DCA Washington, D.C. Reagan-National

ORDDCA

Chicago O'Hare Intl

Tue 12/15

10:00 am-1:05 pm

Nonstop2h 05m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$139

ChicagoWashington, D.C.

MDW Chicago Midway - DCA Washington, D.C. Reagan-National

MDWDCA

Chicago Midway

Thu 12/31

4:30 pm-7:15 pm

Nonstop1h 45m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$139

ChicagoWashington, D.C.

MDW Chicago Midway - DCA Washington, D.C. Reagan-National

MDWDCA

Chicago Midway

Wed 12/23

5:10 pm-7:55 pm

Nonstop1h 45m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$139

ChicagoWashington, D.C.

ORD Chicago O'Hare Intl - IAD Washington, D.C. Dulles Intl

ORDIAD

Chicago O'Hare Intl

Sat 12/12

10:30 am-1:33 pm

Nonstop2h 03m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$139

ChicagoWashington, D.C.

MDW Chicago Midway - DCA Washington, D.C. Reagan-National

MDWDCA

Chicago Midway

Wed 11/25

5:35 am-8:25 am

Nonstop1h 50m

Washington, D.C. Reagan-National

Wed 12/31

12:00 am-11:00 pm

Nonstop0h 00m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/4

Showing 1-10 of 60 resultsSorted by cheapest first

...

Best time to book a flight from Illinois to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Illinois with our price prediction graph.

ORD-IAD

ORD-DCA

MDW-IAD

MDW-DCA

PIA-DCA

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 Illinois to Washington, D.C.

USIL-WAS

ORD-IAD

ORD-DCA

MDW-IAD

MDW-DCA

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

Currently, December is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $321). Flying from Illinois to Washington, D.C. in June is currently the most expensive (average of $404). 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 IL to WAS?

One of the essential ways to save on airfare from Illinois to Washington, D.C. is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 20% on airfare.

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

The most flights from USIL to WAS are scheduled on a Tuesday (93 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (33 on average).

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

Airfare is below average for this route at the moment.

Illinois to Washington, D.C. flights typically cost between $263 and $408 in December.
The cheapest round-trip price found within the last 5 days was $197 on Frontier (Dec 3-Dec 7).

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

The price you pay for your flight from Illinois to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 39 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

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

Related info for your journey

How long is the flight from Illinois to Washington, D.C.?
Airlines like Southwest, United Airlines, and Frontier fly from Illinois to Washington, D.C. in about 1h 50m. The time it takes to get you to your destination can typically vary by up to 9h 43m. The distance between Illinois and Washington, D.C. is about 599 mi. This flight may include one or multiple stops.
What are the cheapest airlines to fly from Illinois to Washington, D.C. one-way?
The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $33. However, be on the lookout for offers from American Airlines and Southwest, as they are both options that can get you from Illinois to Washington, D.C. for a low price.
What are the most popular routes from Illinois to Washington, D.C.?
Most travelers choose Chicago O'Hare Intl - Washington, D.C. Reagan-National, Chicago O'Hare Intl - Baltimore/Washington or Chicago O'Hare Intl - Washington, D.C. Dulles Intl when deciding on the best route from Illinois to Washington, D.C..
What are the most reliable airlines from Illinois to Washington, D.C.?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to Washington, D.C. on time: Air China (94%), Avianca (93%), Copa Airlines (85%).
What are the cheapest flights from Illinois to Washington, D.C.?
On average you can expect to pay $1,120 for a flight from Illinois to Washington, D.C.. The cheapest flight overall is $160 while the most popular route, (Chicago O'Hare Intl - Washington, D.C. Reagan-National) is currently priced at $208.
Can I find deals for flights from Illinois to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on Illinois to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Illinois to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Washington, D.C..
Can I find deals for business class flights from Illinois to Washington, D.C.?
Yes. Cheapflights offers flight deals from Illinois to Washington, D.C. 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 Illinois to Washington, D.C.?
Currently, December is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $321). Flying from Illinois to Washington, D.C. in June is currently the most expensive (average of $404). 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

Alexandria

Woodbridge

Arlington

Lanham

Reston

Herndon

Hyattsville

Springfield

Fredericksburg

Falls Church

Towson

Silver Spring

Rockville

Oxon Hill

Laurel

Clinton

Hunt Valley

Owings Mills

Waldorf

Colonial Beach

Browse thousands of different options on Cheapflights for your next trip

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Washington, D.C. flight routes

Alternative routes for Illinois to Washington, D.C.

Dallas/Fort Worth to Dulles Intl flights

Boston to Reagan-National flights

Dallas/Fort Worth to Reagan-National flights

Los Angeles to Reagan-National flights

Boston to Dulles Intl flights

Los Angeles to Dulles Intl flights

Atlanta to Dulles Intl flights

O'Hare Intl to Reagan-National flights

Atlanta to Reagan-National flights

San Francisco to Dulles Intl flights

O'Hare Intl to Dulles Intl flights

Denver to Dulles Intl flights

Hobby to Dulles Intl flights

Orlando to Reagan-National flights

John F Kennedy Intl to Reagan-National flights

San Francisco to Reagan-National flights

Fort Lauderdale to Reagan-National flights

Orlando to Dulles Intl flights

Seattle to Reagan-National flights

Seattle to Dulles Intl flights

Denver to Reagan-National flights

Hobby to Reagan-National flights

George Bush Intcntl to Dulles Intl flights

Tampa to Dulles Intl flights

Miami to Dulles Intl flights

John F Kennedy Intl to Dulles Intl flights

Newark to Reagan-National flights

LaGuardia to Reagan-National flights

Newark to Dulles Intl flights

San Diego to Dulles Intl flights

Midway to Dulles Intl flights

Minneapolis to Reagan-National flights

Sky Harbor Intl to Dulles Intl flights

Indianapolis to Dulles Intl flights

Minneapolis to Dulles Intl flights

Fort Lauderdale to Dulles Intl flights

Miami to Reagan-National flights

George Bush Intcntl to Reagan-National flights

Detroit to Reagan-National flights

Ontario to Dulles Intl flights

Austin to Dulles Intl flights

Tampa to Reagan-National flights

Charlotte to Dulles Intl flights

Midway to Reagan-National flights

Ontario to Reagan-National flights

Salt Lake City to Reagan-National flights

Sky Harbor Intl to Reagan-National flights

Detroit to Dulles Intl flights

Salt Lake City to Dulles Intl flights

Raleigh to Dulles Intl flights

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

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$57	Average$219	FlexibilityNo cancel fee	On-time62%
JetBlue	Cheapest$141	Average$248	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$177	Average$394	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$186	Average$424	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$191	Average$404	FlexibilityNo cancel fee	On-time63%
Delta	Cheapest$251	Average$376	FlexibilityNo cancel fee	On-timeN/A

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$121+ Cheap flights from Illinois to Washington, D.C. (WAS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/17. 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 Illinois to Washington, D.C.

Cheapest flights from Illinois to Washington, D.C.Explore the most affordable flight options available from Illinois to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 4, 2026.

Explore the most affordable flight options available from Illinois to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 4, 2026.

Best flights from Illinois to Washington, D.C.Discover carefully curated flight deals from Illinois to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 4, 2026.

Discover carefully curated flight deals from Illinois to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 4, 2026.

Last-minute flights from Illinois to Washington, D.C.Discover last-minute flight deals from Illinois to Washington, D.C.. Data last updated November 4, 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to Washington, D.C.. Data last updated November 4, 2026 and is based on user searches.

One-way flights from Illinois to Washington, D.C.Search for one-way flight options from Illinois to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated November 4, 2026.

Search for one-way flight options from Illinois to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated November 4, 2026.

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Best time to book a flight from Illinois to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Illinois with our price prediction graph.

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

What is the cheapest time of day to fly from IL to WAS?

Find hourly flight availability from Illinois to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 4, 2026.

One of the essential ways to save on airfare from Illinois to Washington, D.C. is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 20% on airfare.

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

The most flights from USIL to WAS are scheduled on a Tuesday (93 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (33 on average).

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

Airfare is below average for this route at the moment.

Illinois to Washington, D.C. flights typically cost between $263 and $408 in December.The cheapest round-trip price found within the last 5 days was $197 on Frontier (Dec 3-Dec 7).

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

The price you pay for your flight from Illinois to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 39 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Use this chart to determine the cheapest time to fly round-trip from Illinois to Washington, D.C.. Price data was last updated on October 31, 2026.

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

Related info for your journey

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

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

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

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

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

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

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

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

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

Traveling to a place near Washington, D.C.?

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Alternative routes for Illinois to Washington, D.C.

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Illinois and Washington, D.C. flights

Browse other Illinois and Washington, D.C. flight options. Last updated on November 4, 2026.

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Illinois to Washington, D.C. flights

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Other flights to Washington, D.C.

Explore flights to Washington, D.C. departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on November 4, 2026.

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

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Cheapest flights from Illinois to Washington, D.C.
Explore the most affordable flight options available from Illinois to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 4, 2026.

Best flights from Illinois to Washington, D.C.
Discover carefully curated flight deals from Illinois to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 4, 2026.

Last-minute flights from Illinois to Washington, D.C.
Discover last-minute flight deals from Illinois to Washington, D.C.. Data last updated November 4, 2026 and is based on user searches.

One-way flights from Illinois to Washington, D.C.
Search for one-way flight options from Illinois to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated November 4, 2026.

Illinois to Washington, D.C. flights typically cost between $263 and $408 in December.
The cheapest round-trip price found within the last 5 days was $197 on Frontier (Dec 3-Dec 7).