What airlines fly to Illinois?

United Airlines, Frontier and Delta are the top three most popular airlines that fly to Illinois from Washington, D.C. Dulles Intl Airport according to our data. United Airlines is the first choice among our users, with 88% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 3 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Washington, D.C. Dulles Intl to Illinois?

Delta, United Airlines, and Frontier are the most popular carriers operating from Washington, D.C. Dulles Intl to Illinois

How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to Illinois?

The number of operators available for flights from Washington, D.C. Dulles Intl Airport to Illinois is 4 as of March 2026.

How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Illinois?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Illinois.

What documentation or ID do you need to fly to Illinois?

The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$74 Cheap Flights from Washington, D.C. Dulles Intl Airport to Illinois in 2026

Q: How many flights depart from Washington, D.C. Dulles Intl Airport to Illinois on average per day?

As of March 2026, there are 18 flights per day flying from Washington, D.C. Dulles Intl Airport to Illinois. The most common time of day flights depart is 5:00PM, with 49% of flights taking off in the afternoon.

Q: How many flights depart from Washington, D.C. Dulles Intl Airport to Illinois on average per week?

As of March 2026, 130 flights take off from Washington, D.C. Dulles Intl Airport and land in Illinois each week. The most common flight departure day for this route is Mon, with 22% of weekly flights taking off on this day.

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Find the cheapest flights from Washington, D.C. Dulles Intl Airport to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 am - 11:37 am

IAD

ORD

6h 37m

1 stop

4:57 pm - 7:27 am

ORD

IAD

13h 30m

1 stop

$187Frontier

Fri, Apr 17 - Sun, Apr 19

6:00 am - 10:19 am

IAD

ORD

5h 19m

1 stop

5:04 pm - 11:03 pm

ORD

IAD

4h 59m

1 stop

$188Delta

Fri, Apr 24 - Mon, Apr 27

5:27 pm - 10:28 pm

IAD

MDW

6h 01m

1 stop

6:38 pm - 11:03 pm

MDW

IAD

3h 25m

1 stop

$188Delta

Fri, Apr 17 - Mon, Apr 20

2:39 pm - 11:44 pm

IAD

ORD

10h 05m

1 stop

4:51 pm - 12:21 am

ORD

IAD

6h 30m

1 stop

$189Frontier

Mon, Mar 23 - Wed, Mar 25

7:05 am - 7:59 am

IAD

MDW

25h 54m

2 stops

2:15 pm - 12:36 am

MDW

IAD

9h 21m

1 stop

$189Frontier

Sat, Apr 18 - Tue, Apr 21

7:00 am - 8:23 am

IAD

ORD

26h 23m

1 stop

7:47 pm - 12:21 am

ORD

IAD

27h 34m

1 stop

$190Frontier

Tue, Mar 17 - Tue, Mar 24

8:11 pm - 11:52 pm

IAD

PIA

4h 41m

1 stop

6:23 pm - 11:59 pm

PIA

IAD

4h 36m

1 stop

$251American Airlines

Wed, Apr 15 - Wed, Apr 22

8:11 pm - 11:52 pm

IAD

PIA

4h 41m

1 stop

12:12 pm - 11:06 pm

PIA

IAD

9h 54m

2 stops

$256American Airlines

Wed, Apr 15 - Tue, Apr 21

10:10 am - 2:08 pm

IAD

PIA

4h 58m

1 stop

2:50 pm - 9:04 pm

PIA

IAD

5h 14m

1 stop

$260United Airlines

Thu, Apr 16 - Tue, Apr 21

3:15 pm - 9:13 pm

IAD

STL

6h 58m

1 stop

8:35 am - 11:47 am

STL

IAD

2h 12mnonstop

$268United Airlines

Wed, May 20 - Wed, May 27

Frontier flights from Washington, D.C. Dulles Intl Airport to Illinois

Our best Frontier deals on Washington, D.C. Dulles Intl Airport to Illinois flight tickets

Frontier

Apr 17

IAD6:00 amWashington, D.C. Dulles Intl

6h 37m

1 stop

ORD11:37 amChicago O'Hare Intl

Apr 19

ORD4:57 pmChicago O'Hare Intl

13h 30m

1 stop

IAD7:27 amWashington, D.C. Dulles Intl

$187

Frontier

Mar 23

IAD2:39 pmWashington, D.C. Dulles Intl

10h 05m

1 stop

ORD11:44 pmChicago O'Hare Intl

Mar 25

ORD4:51 pmChicago O'Hare Intl

6h 30m

1 stop

IAD12:21 amWashington, D.C. Dulles Intl

$189

Frontier

Mar 17

IAD7:00 amWashington, D.C. Dulles Intl

26h 23m

1 stop

ORD8:23 amChicago O'Hare Intl

Mar 24

ORD7:47 pmChicago O'Hare Intl

27h 34m

1 stop

IAD12:21 amWashington, D.C. Dulles Intl

$190

Delta flights from Washington, D.C. Dulles Intl Airport to Illinois

Our best Delta deals on Washington, D.C. Dulles Intl Airport to Illinois flight tickets

Delta

Apr 24

IAD6:00 amWashington, D.C. Dulles Intl

5h 19m

1 stop

ORD10:19 amChicago O'Hare Intl

Apr 27

ORD5:04 pmChicago O'Hare Intl

4h 59m

1 stop

IAD11:03 pmWashington, D.C. Dulles Intl

$188

Delta

Mar 24

IAD6:00 amWashington, D.C. Dulles Intl

3h 53m

1 stop

MDW8:53 amChicago Midway

Apr 7

MDW6:34 pmChicago Midway

3h 25m

1 stop

IAD10:59 pmWashington, D.C. Dulles Intl

$199

Delta

Mar 24

IAD5:32 pmWashington, D.C. Dulles Intl

3h 45m

1 stop

ORD8:17 pmChicago O'Hare Intl

Apr 1

ORD5:40 pmChicago O'Hare Intl

4h 19m

1 stop

IAD10:59 pmWashington, D.C. Dulles Intl

$217

momondo 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

Fri 4/17

6:00 am-11:37 am

1 stop6h 37m

Chicago O'Hare Intl

Sun 4/19

4:57 pm-7:27 am

1 stop13h 30m

$187

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Fri 4/24

6:00 am-10:19 am

1 stop5h 19m

Chicago O'Hare Intl

Mon 4/27

5:04 pm-11:03 pm

1 stop4h 59m

$188

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Fri 4/17

5:27 pm-10:28 pm

1 stop6h 01m

Chicago Midway

Mon 4/20

6:38 pm-11:03 pm

1 stop3h 25m

$188

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Mon 3/23

2:39 pm-11:44 pm

1 stop10h 05m

Chicago O'Hare Intl

Wed 3/25

4:51 pm-12:21 am

1 stop6h 30m

$189

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Sat 4/18

7:05 am-7:59 am

2 stops25h 54m

Chicago Midway

Tue 4/21

2:15 pm-12:36 am

1 stop9h 21m

$189

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Tue 3/17

7:00 am-8:23 am

1 stop26h 23m

Chicago O'Hare Intl

Tue 3/24

7:47 pm-12:21 am

1 stop27h 34m

$190

Washington, D.C.Peoria

IAD - PIA

IADPIA

Washington, D.C. Dulles Intl

Wed 4/15

8:11 pm-11:52 pm

1 stop4h 41m

Greater Peoria

Wed 4/22

6:23 pm-11:59 pm

1 stop4h 36m

$251

Washington, D.C.Peoria

IAD - PIA

IADPIA

Washington, D.C. Dulles Intl

Wed 4/15

8:11 pm-11:52 pm

1 stop4h 41m

Greater Peoria

Tue 4/21

12:12 pm-11:06 pm

2 stops9h 54m

$256

Washington, D.C.Peoria

IAD - PIA

IADPIA

Washington, D.C. Dulles Intl

Thu 4/16

10:10 am-2:08 pm

1 stop4h 58m

Greater Peoria

Tue 4/21

2:50 pm-9:04 pm

1 stop5h 14m

$260

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 5/20

3:15 pm-9:13 pm

1 stop6h 58m

Lambert-St Louis

Wed 5/27

8:35 am-11:47 am

Nonstop2h 12m

$268

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Washington, D.C. Dulles Intl Airport is in October. Flight prices, which tend to average around $261, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of October, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $264.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Washington, D.C. Dulles Intl Airport to Illinois is on a Friday when prices can be found for as low as $390. Flights from Washington, D.C. Dulles Intl Airport to Illinois on a Monday will generally be more expensive and average around $570. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Washington, D.C. Dulles Intl Airport to Illinois during this time can be as low as $384. Flights in the morning are often more expensive with an average ticket price of $457.

What is the cheapest Washington, D.C. Dulles Intl to Illinois flight route?

Fly from Washington, D.C. Dulles Intl to Chicago O'Hare Intl for the best Washington, D.C. Dulles Intl - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $349 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Washington, D.C. Dulles Intl Airport for as low as $199 on momondo.

What cabin class options are available on Washington, D.C. Dulles Intl to Illinois flights?

There are 4 cabin classes available to choose from on Washington, D.C. Dulles Intl to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap Washington, D.C. Dulles Intl Airport to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to Illinois

Best Price Found	$173
Fastest flight time	2h 11m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Washington, D.C. Dulles Intl Airport in the past 72 hours is $173. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to Illinois found on momondo in the last 72 hours is $336.

The fastest flight from Washington, D.C. Dulles Intl Airport to Illinois takes 2h 11m

Direct flights go from Washington, D.C. Dulles Intl Airport to Illinois every day.

There are 98 airports in Illinois. From Washington, D.C. Dulles Intl Airport there are direct flights to Chicago O'Hare Intl (ORD).

Search flight deals

When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Illinois?
Prices for flights from Washington, D.C. Dulles Intl Airport to Illinois refresh daily.
How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to Illinois?
The number of operators available for flights from Washington, D.C. Dulles Intl Airport to Illinois is 4 as of March 2026.
How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Illinois?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Washington, D.C. Dulles Intl Airport to Illinois?
momondo data reveals that the most frequently booked plane model on the route from Washington, D.C. Dulles Intl Airport to Illinois is Boeing 737-900, representing 14.63% of all bookings. The subsequent popular models are Airbus A321neo at 10.42%, Boeing 737-800 at 10.15%, and Boeing 737 MAX 8 at 10.08%.

Best airlines flying from Washington, D.C. Dulles Intl Airport to Illinois

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $106	Free Cancellation	Rating 5.7 3,041 reviews	Search Frontier flights
Delta	PriceFrom $194	Free Cancellation	Rating 7.9 8,238 reviews	Search Delta flights
United Airlines	PriceFrom $201	Free Cancellation	Rating 7.4 9,375 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Illinois?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington, D.C. to Illinois. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Washington, D.C. to Illinois with flexible booking policies on momondo?

Flights from Washington, D.C. to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Washington, D.C. to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Washington, D.C..

I’m not ready to book a flight from Washington, D.C. to Illinois right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Illinois from Washington, D.C.. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.