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

For one-way options, check prices for Frontier. According to our data, you can fly for as low as $85. Users have also found prices from $90 and $90 on United Airlines and Allegiant Air, respectively.

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

The most popular route from Washington, D.C. Dulles Intl Airport to Illinois is Washington, D.C. Dulles Intl - Chicago O'Hare Intl. You may also consider Washington, D.C. Dulles Intl - Chicago Midway or Washington, D.C. Dulles Intl - Lambert-St Louis.

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

Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to Illinois? While on average our users pay $734, our data indicates the cheapest price to be $95. The most popular route (Washington, D.C. Dulles Intl - Chicago O'Hare Intl), is priced around $179.

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

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 Washington, D.C. Dulles Intl Airport to Illinois on time: Sun Country Air (100%), Ethiopian Air (85%), Avianca (82%).

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

Consider American Airlines, Delta or Frontier when booking your flight. These represent the most popular airlines when flying from Washington, D.C. Dulles Intl Airport to Illinois.

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

Find a great deal and save up to 80% by booking at least 51 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Washington, D.C. Dulles Intl Airport to Illinois within the next two weeks, with the cheapest ticket starting at $263.

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

The best pricing can be found in the month of September. Prices to Illinois from Washington, D.C. Dulles Intl Airport average $254. You can even find prices in September for less than $254, as users have found deals to Illinois from as low as $63. The month of April appears to be one of the more expensive times to travel to Illinois from Washington, D.C. Dulles Intl Airport. Flying in the targeted month can save you up to 9%.

Can I find deals for flights from Dulles Intl to Illinois that include hotel bookings?

Yes. In addition to deals on Dulles Intl to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Dulles Intl to Illinois?

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

Can I find deals for business class flights from Dulles Intl to Illinois?

Yes. Cheapflights offers flight deals from Dulles Intl 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.

$85+ Flights from Washington, D.C. Dulles Intl Airport to Illinois

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Cheap flight deals from Dulles Intl to Illinois

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$181 (CheapOair)
One-way from	$85 (Trip.com)
Popular in	April
Cheapest in	September
Average price	$279
Good round-trip deal	$299 or less
Good one-way deal	$167 or less

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

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

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From Washington, D.C. Dulles Intl to Illinois

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One-way flight from Washington, D.C. Dulles Intl to Illinois

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($18 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 0% potential price decrease ($3 potential savings vs. average RT price).

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Average for round-trip flights in April 2025

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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Illinois.

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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Illinois.

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Find flight deals from Dulles Intl to Illinois

Cheapest flights from Dulles Intl to Illinois
Explore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2025.

Thu 5/157:31 amIAD - ORD

1 stop22h 39mFrontier

Sat 5/179:19 amORD - IAD

1 stop22h 25mFrontier

Deal found 4/29

$181

Thu 5/153:32 pmIAD - MDW

1 stop9h 07mFrontier

Sat 5/1710:48 amMDW - IAD

1 stop4h 46mFrontier

Deal found 4/29

$181

Fri 5/2310:18 pmIAD - ORD

Nonstop2h 12mUnited Airlines

Sun 5/259:31 pmORD - IAD

Nonstop1h 59mUnited Airlines

Deal found 4/29

$195

Tue 7/16:20 amIAD - ORD

1 stop6h 43mDelta

Tue 7/15:05 pmORD - IAD

1 stop4h 50mDelta

Deal found 4/29

$197

Sat 5/243:37 pmIAD - MDW

1 stop6h 36mDelta

Sun 5/256:00 amMDW - IAD

1 stop4h 41mDelta

Deal found 4/29

$197

Mon 5/197:45 amIAD - STL

1 stop14h 20mFrontier

Wed 5/215:45 pmSTL - IAD

1 stop17h 47mFrontier

Deal found 4/28

$210

Mon 5/268:40 amIAD - STL

Nonstop2h 16mUnited Airlines

Thu 5/295:00 amSTL - IAD

1 stop5h 55mUnited Airlines

Deal found 4/28

$214

Sat 7/1211:49 amIAD - ORD

1 stop6h 31mAmerican Airlines

Sat 7/126:25 pmORD - IAD

1 stop4h 33mAmerican Airlines

Deal found 4/29

$215

Fri 5/306:00 amIAD - STL

1 stop4h 35mDelta

Mon 6/25:45 pmSTL - IAD

1 stop4h 09mDelta

Deal found 4/29

$224

Thu 6/1212:40 pmIAD - ORD

1 stop7h 31mSun Country Air

Thu 6/196:17 pmORD - IAD

1 stop16h 02mSun Country Air

Deal found 4/29

$245

Sun 6/111:54 amIAD - ORD

2 stops33h 09mMultiple Airlines

Fri 6/65:20 pmORD - IAD

1 stop20h 12mMultiple Airlines

Deal found 4/28

$268

Wed 5/285:56 pmIAD - BMI

1 stop5h 51mDelta

Wed 6/45:00 pmBMI - IAD

1 stop5h 35mDelta

Deal found 4/28

$289

Best flights from Dulles Intl to Illinois
Discover carefully curated flight deals from Dulles Intl to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 29, 2025.

Thu 5/157:31 amIAD - ORD

1 stop22h 39mFrontier

Sat 5/179:19 amORD - IAD

1 stop22h 25mFrontier

Deal found 4/29

$181

Fri 5/2310:18 pmIAD - ORD

Nonstop2h 12mUnited Airlines

Sat 5/245:53 pmORD - IAD

Nonstop1h 59mUnited Airlines

Deal found 4/29

$195

Tue 7/15:29 pmIAD - ORD

1 stop4h 55mDelta

Wed 7/211:00 amORD - IAD

1 stop4h 44mDelta

Deal found 4/29

$197

Sat 7/1211:49 amIAD - ORD

1 stop6h 31mAmerican Airlines

Sat 7/126:25 pmORD - IAD

1 stop4h 33mAmerican Airlines

Deal found 4/29

$215

Thu 6/1212:40 pmIAD - ORD

1 stop7h 31mSun Country Air

Thu 6/196:17 pmORD - IAD

1 stop16h 02mSun Country Air

Deal found 4/29

$245

Sun 6/111:54 amIAD - ORD

2 stops33h 09mMultiple Airlines

Fri 6/65:20 pmORD - IAD

1 stop20h 12mMultiple Airlines

Deal found 4/28

$268

Thu 6/193:58 pmIAD - MDW

1 stop16h 17mAllegiant Air

Sun 6/2211:45 amMDW - IAD

2 stops25h 38mAllegiant Air

Deal found 4/29

$294

Thu 5/153:32 pmIAD - MDW

1 stop9h 07mFrontier

Sat 5/1710:48 amMDW - IAD

1 stop4h 46mFrontier

Deal found 4/29

$181

Sat 5/243:37 pmIAD - MDW

1 stop6h 36mDelta

Sun 5/256:00 amMDW - IAD

1 stop4h 41mDelta

Deal found 4/29

$197

Fri 7/48:40 amIAD - STL

Nonstop2h 19mUnited Airlines

Sat 7/55:30 pmSTL - IAD

1 stop6h 00mUnited Airlines

Deal found 4/28

$214

Sun 5/115:26 pmIAD - STL

1 stop7h 40mFrontier

Fri 5/169:55 pmSTL - IAD

1 stop31h 36mFrontier

Deal found 4/29

$221

Tue 5/2710:09 amIAD - STL

1 stop7h 26mDelta

Thu 5/293:40 pmSTL - IAD

1 stop4h 54mDelta

Deal found 4/28

$224

Last-minute flights from Dulles Intl to Illinois
Discover last-minute flight deals from Dulles Intl to Illinois. Data last updated April 29, 2025 and is based on user searches.

Mon 5/53:32 pmIAD - MDW

1 stop9h 15mFrontier

Mon 5/128:30 amMDW - IAD

1 stop4h 53mFrontier

Deal found 4/28

$190

Tue 5/611:47 amIAD - ORD

1 stop5h 54mFrontier

Thu 5/156:00 amORD - IAD

1 stop7h 23mFrontier

Deal found 4/29

$190

Tue 5/612:29 pmIAD - MLI

1 stop4h 51mDelta

Mon 5/125:15 pmMLI - IAD

2 stops17h 30mDelta

Deal found 4/28

$511

Wed 5/75:24 pmIAD - ORD

1 stop3h 57mDelta

Thu 5/299:39 amORD - IAD

1 stop6h 06mDelta

Deal found 4/29

$359

Wed 5/75:24 pmIAD - STL

1 stop4h 25mDelta

Mon 5/126:00 amSTL - IAD

1 stop4h 44mDelta

Deal found 4/28

$419

Wed 5/75:02 amIAD - ORD

1 stop4h 59mAmerican Airlines

Mon 5/126:35 pmORD - IAD

1 stop4h 27mAmerican Airlines

Deal found 4/29

$419

Wed 5/78:35 amIAD - STL

Nonstop2h 23mUnited Airlines

Wed 5/71:00 pmSTL - IAD

Nonstop2h 09mUnited Airlines

Deal found 4/28

$424

Wed 5/76:00 amIAD - MDW

1 stop3h 40mDelta

Mon 5/126:38 pmMDW - IAD

1 stop4h 50mDelta

Deal found 4/28

$454

Thu 5/85:26 pmIAD - STL

1 stop7h 40mFrontier

Sun 5/119:55 pmSTL - IAD

1 stop31h 36mFrontier

Deal found 4/28

$221

Thu 5/85:26 pmIAD - STL

1 stop5h 00mAmerican Airlines

Mon 5/126:47 pmSTL - IAD

1 stop4h 15mAmerican Airlines

Deal found 4/28

$469

Fri 5/910:34 pmIAD - ORD

1 stop10h 09mUnited Airlines

Sat 5/1011:14 amORD - IAD

Nonstop1h 56mUnited Airlines

Deal found 4/29

$319

Fri 5/99:42 pmIAD - ORD

2 stops26h 47mMultiple Airlines

Mon 5/122:19 pmORD - IAD

3 stops20h 07mMultiple Airlines

Deal found 4/29

$343

One-way flights from Dulles Intl to Illinois
Search for one-way flight options from Dulles Intl to Illinois. Find affordable one-way fares based on user searches. Data last updated April 29, 2025.

Sat 6/144:16 pmIAD - ORD

1 stop8h 58mFrontier

Deal found 4/29

$85

Sat 7/196:10 amIAD - MDW

1 stop17h 25mFrontier

Deal found 4/29

$85

Wed 5/288:40 amIAD - STL

Nonstop2h 16mUnited Airlines

Deal found 4/28

$90

Sun 6/83:58 pmIAD - MDW

1 stop16h 17mAllegiant Air

Deal found 4/29

$90

Sat 5/242:10 pmIAD - ORD

1 stop8h 11mDelta

Deal found 4/29

$99

Thu 5/293:37 pmIAD - STL

1 stop6h 02mDelta

Deal found 4/29

$100

Thu 5/296:00 amIAD - MDW

1 stop3h 40mDelta

Deal found 4/29

$100

Thu 5/85:26 pmIAD - STL

1 stop7h 40mFrontier

Deal found 4/28

$109

Fri 5/2310:18 pmIAD - ORD

Nonstop2h 12mUnited Airlines

Deal found 4/29

$115

Thu 6/1211:52 amIAD - ORD

1 stop6h 04mMultiple Airlines

Deal found 4/28

$118

Mon 6/1612:40 pmIAD - ORD

1 stop5h 41mSun Country Air

Deal found 4/29

$123

Sat 6/148:14 pmIAD - STL

1 stop4h 45mAmerican Airlines

Deal found 4/28

$126

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 5/15

7:31 am-5:10 am

1 stop22h 39m

Chicago O'Hare Intl

Sat 5/17

9:19 am-8:44 am

1 stop22h 25m

$181

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 5/15

3:32 pm-11:39 pm

1 stop9h 07m

Chicago Midway

Sat 5/17

10:48 am-4:34 pm

1 stop4h 46m

$181

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Fri 5/23

10:18 pm-11:30 pm

Nonstop2h 12m

Chicago O'Hare Intl

Sun 5/25

9:31 pm-12:30 am

Nonstop1h 59m

$195

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Tue 7/1

6:20 am-12:03 pm

1 stop6h 43m

Chicago O'Hare Intl

Tue 7/1

5:05 pm-10:55 pm

1 stop4h 50m

$197

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Sat 5/24

3:37 pm-9:13 pm

1 stop6h 36m

Chicago Midway

Sun 5/25

6:00 am-11:41 am

1 stop4h 41m

$197

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Mon 5/19

7:45 am-9:05 pm

1 stop14h 20m

Lambert-St Louis

Wed 5/21

5:45 pm-12:32 pm

1 stop17h 47m

$210

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Mon 5/26

8:40 am-9:56 am

Nonstop2h 16m

Lambert-St Louis

Thu 5/29

5:00 am-11:55 am

1 stop5h 55m

$214

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sat 7/12

11:49 am-5:20 pm

1 stop6h 31m

Chicago O'Hare Intl

Sat 7/12

6:25 pm-11:58 pm

1 stop4h 33m

$215

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 5/30

12:53 pm-4:35 pm

1 stop4h 42m

Lambert-St Louis

Mon 6/2

5:45 pm-10:54 pm

1 stop4h 09m

$224

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 6/12

12:40 pm-7:11 pm

1 stop7h 31m

Chicago O'Hare Intl

Thu 6/19

6:17 pm-11:19 am

1 stop16h 02m

$245

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 50 results

...

Best time to book a flight from Dulles Intl to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Dulles Intl 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. Dulles Intl Airport to Illinois

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

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $245). Flying from Washington, D.C. Dulles Intl Airport to Illinois in March is currently the most expensive (average of $321). 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 IAD to IL?

When flying from Washington, D.C. Dulles Intl Airport to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to Illinois

The most flights from IAD to USIL are scheduled on a Monday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 on average).

Rainfall in Illinois by month

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.

Temperature in Illinois by month

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).

Reviews of airlines servicing Illinois

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Washington, D.C. to Illinois to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

9,961 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,295 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,936 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,696 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Allegiant Air

7.3

Good

734 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Illinois one-way?
For one-way options, check prices for Frontier. According to our data, you can fly for as low as $85. Users have also found prices from $90 and $90 on United Airlines and Allegiant Air, respectively.
What are the most popular routes from Washington, D.C. Dulles Intl Airport to Illinois?
The most popular route from Washington, D.C. Dulles Intl Airport to Illinois is Washington, D.C. Dulles Intl - Chicago O'Hare Intl. You may also consider Washington, D.C. Dulles Intl - Chicago Midway or Washington, D.C. Dulles Intl - Lambert-St Louis.
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Illinois?
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 Washington, D.C. Dulles Intl Airport to Illinois on time: Sun Country Air (100%), Ethiopian Air (85%), Avianca (82%).
What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Illinois?
Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to Illinois? While on average our users pay $734, our data indicates the cheapest price to be $95. The most popular route (Washington, D.C. Dulles Intl - Chicago O'Hare Intl), is priced around $179.
Can I find deals for flights from Dulles Intl to Illinois that include hotel bookings?
Yes. In addition to deals on Dulles Intl to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Illinois.
Can I find deals for business class flights from Dulles Intl to Illinois?
Yes. Cheapflights offers flight deals from Dulles Intl 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. Dulles Intl Airport to Illinois?
Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $245). Flying from Washington, D.C. Dulles Intl Airport to Illinois in March is currently the most expensive (average of $321). 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 4 airlines flying from Dulles Intl to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$63	Average$118	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$161	Average$408	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$176	Average$264	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$328	Average$418	FlexibilityNo cancel fee	On-time71%

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$85+ Cheap flights from Dulles Intl (IAD) 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 6/14. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Illinois with Cheapflights

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Cheap flight deals from Dulles Intl to Illinois

Keep the following information in mind while searching for Dulles Intl to Illinois flight deals. Data was last updated April 29, 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 Dulles Intl to Illinois

Cheapest flights from Dulles Intl to IllinoisExplore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2025.

Explore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Dulles Intl to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Dulles Intl with our price prediction graph.

Cheapflights Insights

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

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

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

Find hourly flight availability from Dulles Intl 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 April 29, 2025.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to Illinois

Explore weekly flight availability from Dulles Intl to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 29, 2025.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

Reviews of airlines servicing Illinois

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Washington, D.C. to Illinois to help guide your decision. You can also see how each airline stacks up 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 Dulles Intl to Illinois. 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 Washington, D.C. Dulles Intl Airport to Illinois one-way?

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

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

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

Can I find deals for flights from Dulles Intl to Illinois that include hotel bookings?

How can I find direct flights from Dulles Intl to Illinois?

Can I find deals for business class flights from Dulles Intl to Illinois?

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

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

Top 4 airlines flying from Dulles Intl to Illinois

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Cheapest flights from Dulles Intl to Illinois
Explore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2025.