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 87% 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?

Frontier, United Airlines, and Allegiant Air 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 December 2025.

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.

$56 Cheap Flights from Washington, D.C. Dulles Intl Airport to Illinois in 2025/26

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

As of December 2025, 162 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 Thu, with 17% of weekly flights taking off on this day.

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

As of December 2025, there are 23 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 52% of flights taking off in the afternoon.

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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.

1:46 pm - 8:18 am

IAD

ORD

19h 32m1 stop

5:57 pm - 11:43 am

ORD

IAD

16h 46m1 stop

$137Multiple Airlines

Sun, Jan 11 - Wed, Jan 14

5:42 pm - 10:39 pm

IAD

ORD

5h 57m1 stop

5:50 am - 3:27 pm

ORD

IAD

8h 37m1 stop

$139Frontier

Wed, Jan 7 - Mon, Jan 12

5:42 pm - 10:39 pm

IAD

ORD

5h 57m1 stop

8:27 pm - 7:55 am

ORD

IAD

10h 28m1 stop

$142Frontier

Wed, Jan 7 - Thu, Jan 8

1:46 pm - 2:06 pm

IAD

MDW

25h 20m1 stop

8:19 pm - 1:03 pm

MDW

IAD

15h 44m1 stop

$142Frontier

Thu, Jan 8 - Thu, Jan 15

8:15 am - 12:13 pm

IAD

MLI

4h 58m1 stop

3:45 pm - 9:17 pm

MLI

IAD

4h 32m1 stop

$249United Airlines

Mon, Jan 5 - Sat, Jan 10

8:35 am - 10:08 am

IAD

STL

2h 33mnonstop

8:15 am - 11:24 am

STL

IAD

2h 09mnonstop

$262United Airlines

Thu, Dec 25 - Thu, Jan 1

7:05 am - 12:13 pm

IAD

MLI

6h 08m1 stop

12:41 pm - 8:30 pm

MLI

IAD

6h 49m1 stop

$328American Airlines

Wed, Mar 4 - Mon, Mar 9

10:06 am - 4:18 pm

IAD

MLI

7h 12m1 stop

5:06 pm - 12:26 am

MLI

IAD

6h 20m1 stop

$329Delta

Wed, Mar 4 - Mon, Mar 9

11:22 am - 11:06 pm

IAD

MLI

12h 44m2 stops

12:41 pm - 8:30 pm

MLI

IAD

6h 49m1 stop

$333American Airlines

Wed, Mar 4 - Mon, Mar 9

6:15 pm - 10:28 pm

IAD

MLI

5h 13m1 stop

5:11 pm - 11:37 pm

MLI

IAD

5h 26m1 stop

$375Delta

Mon, Jan 5 - Sat, Jan 10

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

Jan 7

IAD5:42 pmWashington, D.C. Dulles Intl

5h 57m

1 stop

ORD10:39 pmChicago O'Hare Intl

Jan 12

ORD5:50 amChicago O'Hare Intl

8h 37m

1 stop

IAD3:27 pmWashington, D.C. Dulles Intl

$139

Find similar

Frontier

Jan 7

IAD5:42 pmWashington, D.C. Dulles Intl

5h 57m

1 stop

ORD10:39 pmChicago O'Hare Intl

Jan 8

ORD8:27 pmChicago O'Hare Intl

10h 28m

1 stop

IAD7:55 amWashington, D.C. Dulles Intl

$142

Find similar

Frontier

Jan 22

IAD5:37 pmWashington, D.C. Dulles Intl

6h 09m

1 stop

ORD10:46 pmChicago O'Hare Intl

Jan 26

ORD5:40 amChicago O'Hare Intl

9h 48m

1 stop

IAD4:28 pmWashington, D.C. Dulles Intl

$145

Find similar

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

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

United Airlines

Dec 24

IAD5:31 pmWashington, D.C. Dulles Intl

2h 21m

ORD6:52 pmChicago O'Hare Intl

Jan 1

ORD8:51 amChicago O'Hare Intl

1h 54m

IAD11:45 amWashington, D.C. Dulles Intl

$223

Find similar

United Airlines

Dec 25

IAD8:15 amWashington, D.C. Dulles Intl

2h 23m

ORD9:38 amChicago O'Hare Intl

Jan 14

ORD8:45 amChicago O'Hare Intl

1h 54m

IAD11:39 amWashington, D.C. Dulles Intl

$227

Find similar

United Airlines

Dec 25

IAD8:35 amWashington, D.C. Dulles Intl

2h 33m

STL10:08 amLambert-St Louis

Jan 1

STL8:15 amLambert-St Louis

2h 09m

IAD11:24 amWashington, D.C. Dulles Intl

$262

Find similar

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

Sun 1/11

1:46 pm-8:18 am

1 stop19h 32m

Chicago O'Hare Intl

Wed 1/14

5:57 pm-11:43 am

1 stop16h 46m

$137

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Wed 1/7

5:42 pm-10:39 pm

1 stop5h 57m

Chicago O'Hare Intl

Mon 1/12

5:50 am-3:27 pm

1 stop8h 37m

$139

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Wed 1/7

5:42 pm-10:39 pm

1 stop5h 57m

Chicago O'Hare Intl

Thu 1/8

8:27 pm-7:55 am

1 stop10h 28m

$142

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 1/8

1:46 pm-2:06 pm

1 stop25h 20m

Chicago Midway

Thu 1/15

8:19 pm-1:03 pm

1 stop15h 44m

$142

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Mon 1/5

8:15 am-12:13 pm

1 stop4h 58m

Moline Quad-City

Sat 1/10

3:45 pm-9:17 pm

1 stop4h 32m

$249

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 12/25

8:35 am-10:08 am

Nonstop2h 33m

Lambert-St Louis

Thu 1/1

8:15 am-11:24 am

Nonstop2h 09m

$262

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Wed 3/4

7:05 am-12:13 pm

1 stop6h 08m

Moline Quad-City

Mon 3/9

12:41 pm-8:30 pm

1 stop6h 49m

$328

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Wed 3/4

10:06 am-4:18 pm

1 stop7h 12m

Moline Quad-City

Mon 3/9

5:06 pm-12:26 am

1 stop6h 20m

$329

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Wed 3/4

11:22 am-11:06 pm

2 stops12h 44m

Moline Quad-City

Mon 3/9

12:41 pm-8:30 pm

1 stop6h 49m

$333

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Mon 1/5

6:15 pm-10:28 pm

1 stop5h 13m

Moline Quad-City

Sat 1/10

5:11 pm-11:37 pm

1 stop5h 26m

$375

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 $265.

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 $397. Flights from Washington, D.C. Dulles Intl Airport to Illinois on a Monday will generally be more expensive and average around $560. 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 $346. Flights in the afternoon are often more expensive with an average ticket price of $479.

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 $325 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 $216 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.

Can stopping save me money on Washington, D.C. Dulles Intl Airport to Illinois flights?

You could potentially save up to 21% on your flight if you consider stops on a Washington, D.C. Dulles Intl Airport to Illinois flight.

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	$208
Fastest flight time	2h 03m
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 $208. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to Illinois found on momondo in the last 72 hours is $340.

The fastest flight from Washington, D.C. Dulles Intl Airport to Illinois takes 2h 03m

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), Lambert-St Louis (STL).

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 December 2025.
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 737-800, representing 14.00% of all bookings. The subsequent popular models are Boeing 737-900 at 13.07%, Airbus A321neo at 9.93%, and Airbus A319 at 6.85%.

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 $122	Free Cancellation	Rating 5.8 3,084 reviews	Search Frontier flights
United Airlines	PriceFrom $207	Free Cancellation	Rating 7.4 9,095 reviews	Search United Airlines flights
Delta	PriceFrom $234	Free Cancellation	Rating 7.9 8,007 reviews	Search Delta 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.

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Popular cities in Illinois

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Flights to Las Vegasfrom $40

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Washington, D.C. Dulles Intl Airport flight routes

Flights from Washington, D.C. Dulles Intl to Tweed-New Haven

Flights from Washington, D.C. Dulles Intl to Miami

Flights from Washington, D.C. Dulles Intl to Atlanta Hartsfield-Jackson

Flights from Washington, D.C. Dulles Intl to Orlando

Flights from Washington, D.C. Dulles Intl to Tampa

Flights from Washington, D.C. Dulles Intl to Asheville Regional

Cheap flights from Washington, D.C. Dulles Intl Airport to Illinois from $56

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

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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

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

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

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.

See travel insights to Illinois from

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

What is the cheapest month to fly to Illinois?

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

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 $346. Flights in the afternoon are often more expensive with an average ticket price of $479.

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?

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.

Can stopping save me money on Washington, D.C. Dulles Intl Airport to Illinois flights?

You could potentially save up to 21% on your flight if you consider stops on a Washington, D.C. Dulles Intl Airport to Illinois flight.

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

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

What airlines fly to Illinois?

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

As of December 2025, there are 23 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 52% of flights taking off in the afternoon.

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

As of December 2025, 162 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 Thu, with 17% of weekly flights taking off on this day.

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

Fastest flight time

Direct flights

Airports in Illinois

When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Illinois?

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

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

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

What is the most popular plane model from Washington, D.C. Dulles Intl Airport to Illinois?

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

Why use momondo?

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

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

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

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

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Illinois

Popular cities in Illinois

Popular flights according to clicks in the last 7 days on momondo