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 $69. However, be on the lookout for offers from Spirit Airlines and United Airlines, 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 - Baltimore/Washington, Chicago O'Hare Intl - Washington, D.C. Dulles Intl or Chicago O'Hare Intl - Washington, D.C. Reagan-National 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 $1,723 for a flight from Illinois to Washington, D.C.. The cheapest flight overall is $96 while the most popular route, (Chicago O'Hare Intl - Baltimore/Washington) is currently priced at $104.

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: Avianca (90%), Air China (89%), Austrian Airlines (89%).

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 American Airlines, Delta or Frontier as they are the most popular for this route.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 58 days in advance, which can save you up to 55% on flights from Illinois to Washington, D.C. compared to booking the week you need them. Waiting 58 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $226. For sooner than that we have options available in the next 3 days from $419.

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

Due to multiple factors, expect to potentially pay more when booking in March. For low rates, August can be a great choice for travel to Washington, D.C.. Flights to Washington, D.C. from Illinois in August are about $233 on average during August, but can be found for as low as $67.

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.

$69+ Flights from Illinois to Washington, D.C.

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$157 (Mytrip)
One-way from	$69 (CheapOair)
Popular in	March
Cheapest in	August
Average price	$273
Good round-trip deal	$155 or less
Good one-way deal	$77 or less

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

Search Deals

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

Search Deals

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. 4% potential increase in price ($10 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 March 2025

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

Find 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 March 28, 2025.

Tue 5/1312:41 pmORD - BWI

2 stops17h 50mSpirit Airlines

Thu 5/158:24 amBWI - ORD

Nonstop2h 14mSpirit Airlines

Deal found 3/27

$157

Mon 4/141:03 pmMDW - BWI

Nonstop1h 50mFrontier

Wed 4/164:45 pmBWI - MDW

Nonstop2h 06mFrontier

Deal found 3/27

$158

Wed 4/306:45 pmORD - BWI

Nonstop2h 04mAmerican Airlines

Sat 5/37:30 amBWI - ORD

Nonstop2h 10mAmerican Airlines

Deal found 3/27

$158

Sat 5/37:55 pmMDW - BWI

Nonstop1h 50mSouthwest

Tue 5/65:00 pmBWI - MDW

Nonstop2h 00mSouthwest

Deal found 3/27

$159

Sat 4/261:30 pmORD - BWI

Nonstop2h 00mSouthwest

Sat 5/311:30 amBWI - ORD

Nonstop2h 15mSouthwest

Deal found 3/27

$159

Sat 4/265:59 pmMDW - BWI

1 stop3h 45mDelta

Tue 4/298:05 amBWI - MDW

1 stop4h 58mDelta

Deal found 3/27

$167

Sat 4/265:00 pmORD - BWI

1 stop4h 44mDelta

Tue 4/2912:47 pmBWI - ORD

1 stop4h 24mDelta

Deal found 3/27

$167

Thu 4/245:45 amSTL - BWI

Nonstop2h 00mSouthwest

Thu 5/19:30 pmBWI - STL

Nonstop2h 15mSouthwest

Deal found 3/27

$177

Thu 4/1711:15 amORD - DCA

Nonstop1h 56mUnited Airlines

Thu 4/178:00 pmDCA - ORD

Nonstop2h 17mUnited Airlines

Deal found 3/27

$177

Wed 4/235:25 pmMDW - DCA

Nonstop1h 55mSouthwest

Wed 4/303:30 pmDCA - MDW

Nonstop2h 10mSouthwest

Deal found 3/26

$177

Thu 4/178:45 amORD - IAD

Nonstop1h 59mUnited Airlines

Thu 4/1710:20 pmIAD - ORD

Nonstop2h 09mUnited Airlines

Deal found 3/27

$177

Wed 5/146:00 amORD - DCA

Nonstop1h 54mAmerican Airlines

Wed 5/142:54 pmDCA - ORD

Nonstop2h 19mAmerican Airlines

Deal found 3/27

$178

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 March 28, 2025.

Tue 5/1312:41 pmORD - BWI

2 stops17h 50mSpirit Airlines

Thu 5/158:24 amBWI - ORD

Nonstop2h 14mSpirit Airlines

Deal found 3/27

$157

Mon 4/141:03 pmMDW - BWI

Nonstop1h 50mFrontier

Wed 4/164:45 pmBWI - MDW

Nonstop2h 06mFrontier

Deal found 3/27

$158

Wed 4/306:45 pmORD - BWI

Nonstop2h 04mAmerican Airlines

Sat 5/37:30 amBWI - ORD

Nonstop2h 10mAmerican Airlines

Deal found 3/27

$158

Sat 5/37:55 pmMDW - BWI

Nonstop1h 50mSouthwest

Tue 5/65:00 pmBWI - MDW

Nonstop2h 00mSouthwest

Deal found 3/27

$159

Sat 4/265:59 pmMDW - BWI

1 stop3h 45mDelta

Tue 4/298:05 amBWI - MDW

1 stop4h 58mDelta

Deal found 3/27

$167

Wed 4/236:00 amORD - DCA

Nonstop1h 58mUnited Airlines

Wed 4/307:25 amDCA - ORD

Nonstop2h 16mUnited Airlines

Deal found 3/26

$177

Fri 5/28:50 amORD - DCA

1 stop8h 10mJetBlue

Sun 5/412:45 pmDCA - ORD

1 stop5h 50mJetBlue

Deal found 3/26

$183

Thu 6/269:47 amORD - BWI

Nonstop1h 54mMultiple Airlines

Sun 6/2912:25 pmBWI - ORD

1 stop7h 52mMultiple Airlines

Deal found 3/27

$211

Thu 4/177:10 pmORD - IAD

1 stop15h 13mSun Country Air

Mon 4/2111:37 amIAD - ORD

1 stop7h 29mSun Country Air

Deal found 3/25

$240

Fri 6/62:53 pmMDW - IAD

2 stops29h 00mAllegiant Air

Sun 6/83:58 pmIAD - MDW

1 stop16h 17mAllegiant Air

Deal found 3/27

$304

Sat 4/261:30 pmORD - BWI

Nonstop2h 00mSouthwest

Sat 5/311:30 amBWI - ORD

Nonstop2h 15mSouthwest

Deal found 3/27

$159

Sat 4/265:00 pmORD - BWI

1 stop4h 44mDelta

Tue 4/2912:47 pmBWI - ORD

1 stop4h 24mDelta

Deal found 3/27

$167

Last-minute flights from Illinois to Washington, D.C.
Discover last-minute flight deals from Illinois to Washington, D.C.. Data last updated March 28, 2025 and is based on user searches.

Wed 4/26:40 amMDW - DCA

1 stop9h 19mFrontier

Sat 4/51:03 pmDCA - MDW

1 stop12h 18mFrontier

Deal found 3/26

$198

Wed 4/24:57 pmSTL - BWI

1 stop21h 00mFrontier

Mon 4/710:00 pmBWI - STL

1 stop26h 46mFrontier

Deal found 3/26

$245

Wed 4/24:57 pmSTL - IAD

1 stop23h 07mFrontier

Mon 4/75:54 pmIAD - STL

1 stop6h 52mFrontier

Deal found 3/26

$246

Wed 4/26:51 pmSTL - DCA

1 stop16h 13mFrontier

Thu 4/36:00 pmDCA - STL

1 stop16h 06mFrontier

Deal found 3/26

$247

Thu 4/310:19 amMDW - IAD

1 stop5h 45mFrontier

Mon 4/73:28 pmIAD - MDW

1 stop9h 22mFrontier

Deal found 3/27

$198

Thu 4/35:00 pmORD - BWI

1 stop6h 44mFrontier

Mon 4/74:12 pmBWI - ORD

1 stop9h 11mFrontier

Deal found 3/27

$238

Thu 4/36:45 amORD - DCA

1 stop14h 14mFrontier

Fri 4/46:00 pmDCA - ORD

1 stop7h 37mFrontier

Deal found 3/27

$238

Thu 4/34:15 pmORD - BWI

2 stops30h 57mSpirit Airlines

Mon 4/76:05 amBWI - ORD

1 stop27h 39mSpirit Airlines

Deal found 3/26

$276

Fri 4/41:03 pmMDW - BWI

Nonstop1h 50mFrontier

Mon 4/74:43 pmBWI - MDW

Nonstop2h 06mFrontier

Deal found 3/27

$197

Fri 4/49:54 amORD - IAD

1 stop6h 11mFrontier

Mon 4/74:38 pmIAD - ORD

1 stop8h 45mFrontier

Deal found 3/27

$198

Fri 4/49:14 amORD - BWI

1 stop7h 45mMultiple Airlines

Mon 4/79:20 pmBWI - ORD

1 stop13h 39mMultiple Airlines

Deal found 3/27

$286

Fri 4/49:23 amMDW - BWI

1 stop6h 27mDelta

Sat 4/56:00 amBWI - MDW

1 stop3h 43mDelta

Deal found 3/27

$297

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 March 28, 2025.

Wed 4/21:05 pmMDW - BWI

Nonstop1h 50mFrontier

Deal found 3/26

$69

Wed 4/307:47 pmORD - BWI

1 stop12h 35mSpirit Airlines

Deal found 3/27

$70

Tue 4/296:10 pmSTL - BWI

1 stop14h 12mSpirit Airlines

Deal found 3/27

$78

Tue 4/297:00 amORD - BWI

Nonstop1h 54mUnited Airlines

Deal found 3/27

$79

Sat 5/37:55 pmMDW - BWI

Nonstop1h 50mSouthwest

Deal found 3/27

$80

Sat 5/39:52 amMDW - BWI

1 stop5h 40mDelta

Deal found 3/27

$84

Sat 5/35:34 pmORD - BWI

1 stop6h 07mDelta

Deal found 3/27

$84

Fri 4/119:54 amORD - IAD

1 stop6h 11mFrontier

Deal found 3/27

$88

Wed 4/166:15 amSTL - BWI

Nonstop2h 00mSouthwest

Deal found 3/26

$89

Wed 4/231:23 pmORD - DCA

Nonstop1h 56mAmerican Airlines

Deal found 3/27

$89

Tue 4/293:20 pmMDW - DCA

Nonstop1h 50mSouthwest

Deal found 3/27

$89

Tue 5/1311:10 amORD - IAD

Nonstop1h 56mUnited Airlines

Deal found 3/27

$89

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

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Tue 5/13

12:41 pm-7:31 am

2 stops17h 50m

Baltimore/Washington

Thu 5/15

8:24 am-9:38 am

Nonstop2h 14m

$157

ChicagoBaltimore

MDW - BWI

MDWBWI

Chicago Midway

Mon 4/14

1:03 pm-3:53 pm

Nonstop1h 50m

Baltimore/Washington

Wed 4/16

4:45 pm-5:51 pm

Nonstop2h 06m

$158

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Wed 4/30

6:45 pm-9:49 pm

Nonstop2h 04m

Baltimore/Washington

Sat 5/3

7:30 am-8:40 am

Nonstop2h 10m

$158

ChicagoBaltimore

MDW - BWI

MDWBWI

Chicago Midway

Sat 5/3

7:55 pm-10:45 pm

Nonstop1h 50m

Baltimore/Washington

Tue 5/6

5:00 pm-6:00 pm

Nonstop2h 00m

$159

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Sat 4/26

1:30 pm-4:30 pm

Nonstop2h 00m

Baltimore/Washington

Sat 5/3

11:30 am-12:45 pm

Nonstop2h 15m

$159

ChicagoBaltimore

MDW - BWI

MDWBWI

Chicago Midway

Sat 4/26

5:59 pm-10:44 pm

1 stop3h 45m

Baltimore/Washington

Tue 4/29

8:05 am-12:03 pm

1 stop4h 58m

$167

ChicagoBaltimore

ORD - BWI

ORDBWI

Chicago O'Hare Intl

Sat 4/26

5:00 pm-10:44 pm

1 stop4h 44m

Baltimore/Washington

Tue 4/29

12:47 pm-4:11 pm

1 stop4h 24m

$167

ChicagoWashington, D.C.

ORD - DCA

ORDDCA

Chicago O'Hare Intl

Thu 4/17

11:15 am-2:11 pm

Nonstop1h 56m

Washington, D.C. Reagan-National

Thu 4/17

8:00 pm-9:17 pm

Nonstop2h 17m

$177

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Thu 4/17

8:45 am-11:44 am

Nonstop1h 59m

Washington, D.C. Dulles Intl

Thu 4/17

10:20 pm-11:29 pm

Nonstop2h 09m

$177

St. LouisBaltimore

STL - BWI

STLBWI

Lambert-St Louis

Thu 4/24

5:45 am-8:45 am

Nonstop2h 00m

Baltimore/Washington

Thu 5/1

9:30 pm-10:45 pm

Nonstop2h 15m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

Showing 1-10 of 60 results

...

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.

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.

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

Currently, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $309). Flying from Illinois to Washington, D.C. in June is currently the most expensive (average of $385). 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Washington, D.C. as you normally would.

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

The most flights from USIL to WAS are scheduled on a Friday (71 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Washington, D.C. by month

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.

Temperature in Washington, D.C. by month

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).

Reviews of airlines servicing Washington, D.C.

See what other customers who have flown with Southwest, Alaska Airlines and Delta from Illinois to Washington, D.C. have to say. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest

8.1

Very good

4,273 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Alaska Airlines

8.0

Very good

9,798 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta

8.0

Very good

7,896 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines

7.4

Good

8,603 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

JetBlue

7.3

Good

2,923 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

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 $69. However, be on the lookout for offers from Spirit Airlines and United Airlines, 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 - Baltimore/Washington, Chicago O'Hare Intl - Washington, D.C. Dulles Intl or Chicago O'Hare Intl - Washington, D.C. Reagan-National 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: Avianca (90%), Air China (89%), Austrian Airlines (89%).
What are the cheapest flights from Illinois to Washington, D.C.?
On average you can expect to pay $1,723 for a flight from Illinois to Washington, D.C.. The cheapest flight overall is $96 while the most popular route, (Chicago O'Hare Intl - Baltimore/Washington) is currently priced at $104.
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, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. (average of $309). Flying from Illinois to Washington, D.C. in June is currently the most expensive (average of $385). 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

Arlington

Alexandria

Fairfax

Tysons

Springfield

Rockville

Woodbridge

Gaithersburg

Fredericksburg

Linthicum Heights

Silver Spring

Falls Church

Laurel

Easton

Herndon

Bowie

Gettysburg

National Harbor

Oxon Hill

Reston

Browse thousands of different options on Cheapflights for your next trip

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

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$54	Average$161	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$109	Average$373	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$124	Average$331	FlexibilityNo cancel fee	On-timeN/A
Spirit Airlines	Cheapest$135	Average$174	FlexibilityNo cancel fee	On-time65%
Southwest	Cheapest$139	Average$290	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$172	Average$348	FlexibilityNo cancel fee	On-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$69+ Cheap flights from Illinois to Washington, D.C. (WAS)

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 4/2. Fares are subject to change and may not be available on all flights or dates of travel.

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

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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

Keep the following information in mind while searching for Illinois to Washington, D.C. flight deals. Data was last updated March 28, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from 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 March 28, 2025.

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 March 28, 2025.

Cheapflights Fare Finder

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

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.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Washington, D.C.

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 March 28, 2025.

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

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

Reviews of airlines servicing Washington, D.C.

See what other customers who have flown with Southwest, Alaska Airlines and Delta from Illinois to Washington, D.C. have to say. In addition to providing an overall rating, 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 Illinois to Washington, D.C.. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines to fly from 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 Illinois?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Washington, D.C.

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

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

100% Free

Book with Flexibility

Travel Smart

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 March 28, 2025.