How many flights depart from Denver to Illinois on average per day?

The number of flights available between Denver and Illinois is 17 per day as of March 2026. The most frequent departure time is 9:00AM, with 49% of daily flights leaving in the afternoon.

How many flights depart from Denver to Illinois on average per week?

As of March 2026, 122 flights take off from Denver and land in Illinois each week. The most common flight departure day for this route is Sat, with 63% of weekly flights taking off on this day.

What airlines fly to Illinois?

United Airlines, American Airlines and Frontier are the top three most popular airlines that fly to Illinois from Denver according to our data. United Airlines is the first choice among our users, with 32% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 6 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 Denver Intl to Illinois?

Southwest, United Airlines, and American Airlines are the most popular carriers operating from Denver Intl to Illinois

When did momondo last update prices for flights from Denver Intl Airport to Illinois?

Prices for flights from Denver Intl Airport to Illinois are updated daily.

How many operators does momondo search for flights from Denver Intl Airport to Illinois?

The number of operators available for flights from Denver Intl Airport to Illinois is 7 as of March 2026.

How old do you have to be to fly from Denver Intl Airport to Illinois?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Denver 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.

$42 Cheap Flights from Denver to Illinois in 2026

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:35 am - 9:49 am

DEN

STL

2h 14mnonstop

8:12 pm - 9:49 pm

STL

DEN

2h 37mnonstop

$87Frontier

Mon, Mar 16 - Wed, Mar 25

4:09 pm - 7:21 pm

DEN

STL

2h 12mnonstop

8:12 pm - 9:45 pm

STL

DEN

2h 33mnonstop

$88Frontier

Fri, May 1 - Fri, May 8

6:40 am - 9:48 am

DEN

STL

2h 08mnonstop

8:17 pm - 9:50 pm

STL

DEN

2h 33mnonstop

$92Frontier

Mon, Apr 13 - Sat, Apr 18

5:55 pm - 9:19 pm

DEN

PIA

2h 24mnonstop

1:20 pm - 6:06 pm

PIA

DEN

5h 46m

1 stop

$219United Airlines

Tue, Apr 21 - Tue, Apr 28

6:10 pm - 9:32 pm

DEN

MLI

2h 22mnonstop

7:34 pm - 12:58 am

MLI

DEN

6h 24m

1 stop

$219United Airlines

Thu, Apr 9 - Sun, Apr 12

5:45 am - 3:23 pm

DEN

BMI

8h 38m

1 stop

4:04 pm - 12:09 am

BMI

DEN

9h 05m

1 stop

$229Delta

Wed, Apr 8 - Sat, Apr 11

5:30 am - 2:31 pm

DEN

CMI

8h 01m

1 stop

6:58 pm - 11:59 pm

CMI

DEN

6h 01m

1 stop

$238American Airlines

Tue, Apr 28 - Sun, May 3

4:24 pm - 7:30 pm

DEN

PIA

2h 06mnonstop

11:07 am - 12:34 pm

PIA

DEN

2h 27mnonstop

$240Allegiant Air

Thu, Jun 25 - Sun, Jun 28

6:19 am - 12:52 pm

DEN

PIA

5h 33m

1 stop

7:05 pm - 11:59 pm

PIA

DEN

5h 54m

1 stop

$249American Airlines

Fri, May 1 - Mon, May 4

3:30 pm - 10:21 pm

DEN

BMI

5h 51m

1 stop

4:14 pm - 10:23 pm

BMI

DEN

7h 09m

1 stop

$249Delta

Tue, May 5 - Tue, May 12

United Airlines flights from Denver to Illinois

Our best United Airlines deals on Denver to Illinois flight tickets

United Airlines

Apr 1

DEN4:35 pmDenver Intl

2h 39m

ORD8:14 pmChicago O'Hare Intl

Apr 8

ORD7:00 amChicago O'Hare Intl

2h 55m

DEN8:55 amDenver Intl

$177

United Airlines

Jun 17

DEN6:00 pmDenver Intl

2h 39m

ORD9:39 pmChicago O'Hare Intl

Jun 20

ORD7:05 amChicago O'Hare Intl

2h 50m

DEN8:55 amDenver Intl

$195

United Airlines

Apr 23

DEN7:50 pmDenver Intl

2h 38m

ORD11:28 pmChicago O'Hare Intl

Apr 27

ORD10:04 pmChicago O'Hare Intl

2h 55m

DEN11:59 pmDenver Intl

$197

Southwest flights from Denver to Illinois

Our best Southwest deals on Denver to Illinois flight tickets

Southwest

Apr 14

DEN6:35 amDenver Intl

2h 20m

MDW9:55 amChicago Midway

Apr 14

MDW8:50 pmChicago Midway

2h 45m

DEN10:35 pmDenver Intl

$177

Southwest

Apr 14

DEN11:05 amDenver Intl

4h 30m

1 stop

MDW4:35 pmChicago Midway

Apr 14

MDW8:50 pmChicago Midway

2h 45m

DEN10:35 pmDenver Intl

$183

Southwest

Mar 31

DEN8:10 amDenver Intl

2h 25m

MDW11:35 amChicago Midway

Apr 4

MDW6:20 pmChicago Midway

2h 45m

DEN8:05 pmDenver Intl

$186

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Mon 3/16

6:35 am-9:49 am

Nonstop2h 14m

Lambert-St Louis

Wed 3/25

8:12 pm-9:49 pm

Nonstop2h 37m

$87

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 5/1

4:09 pm-7:21 pm

Nonstop2h 12m

Lambert-St Louis

Fri 5/8

8:12 pm-9:45 pm

Nonstop2h 33m

$88

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Mon 4/13

6:40 am-9:48 am

Nonstop2h 08m

Lambert-St Louis

Sat 4/18

8:17 pm-9:50 pm

Nonstop2h 33m

$92

DenverPeoria

DEN - PIA

DENPIA

Denver Intl

Tue 4/21

5:55 pm-9:19 pm

Nonstop2h 24m

Greater Peoria

Tue 4/28

1:20 pm-6:06 pm

1 stop5h 46m

$219

DenverMoline

DEN - MLI

DENMLI

Denver Intl

Thu 4/9

6:10 pm-9:32 pm

Nonstop2h 22m

Moline Quad-City

Sun 4/12

7:34 pm-12:58 am

1 stop6h 24m

$219

DenverBloomington

DEN - BMI

DENBMI

Denver Intl

Wed 4/8

5:45 am-3:23 pm

1 stop8h 38m

Bloomington-Normal

Sat 4/11

4:04 pm-12:09 am

1 stop9h 05m

$229

DenverChampaign

DEN - CMI

DENCMI

Denver Intl

Tue 4/28

5:30 am-2:31 pm

1 stop8h 01m

Champaign University-Willard

Sun 5/3

6:58 pm-11:59 pm

1 stop6h 01m

$238

Quickest round-trip

DenverPeoria

DEN - PIA

DENPIA

Denver Intl

Thu 6/25

4:24 pm-7:30 pm

Nonstop2h 06m

Greater Peoria

Sun 6/28

11:07 am-12:34 pm

Nonstop2h 27m

$240

DenverPeoria

DEN - PIA

DENPIA

Denver Intl

Fri 5/1

6:19 am-12:52 pm

1 stop5h 33m

Greater Peoria

Mon 5/4

7:05 pm-11:59 pm

1 stop5h 54m

$249

DenverBloomington

DEN - BMI

DENBMI

Denver Intl

Tue 5/5

3:30 pm-10:21 pm

1 stop5h 51m

Bloomington-Normal

Tue 5/12

4:14 pm-10:23 pm

1 stop7h 09m

$249

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Denver 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 Denver is in August. Flight prices, which tend to average around $195, 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 August, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $197.

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

The cheapest day to depart from Denver to Illinois is on a Thursday when prices can be found for as low as $295. Flights from Denver to Illinois on a Sunday will generally be more expensive and average around $519. 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 Denver to Illinois during this time can be as low as $205. Flights at noon are often more expensive with an average ticket price of $564.

What is the cheapest Denver Intl to Illinois flight route?

Fly from Denver Intl to Chicago O'Hare Intl for the best Denver 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 Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $253 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Denver for as low as $198 on momondo.

What cabin class options are available on Denver Intl to Illinois flights?

There are 4 cabin classes available to choose from on Denver 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 Denver to Illinois flights?

No. A direct flight is the cheapest option for a flight between Denver to Illinois.

Cheap Denver to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Denver to Illinois

Best Price Found	$145
Fastest flight time	1h 58m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Denver in the past 72 hours is $145. The best round-trip flight deal from Denver to Illinois found on momondo in the last 72 hours is $263.

The fastest flight from Denver to Illinois takes 1h 58m

Direct flights go from Denver to Illinois every day.

There are 98 airports in Illinois. From Denver there are direct flights to Greater Peoria (PIA), Lambert-St Louis (STL), Moline Quad-City (MLI).

Search flight deals

When did momondo last update prices for flights from Denver Intl Airport to Illinois?
Prices for flights from Denver Intl Airport to Illinois are updated daily.
How many operators does momondo search for flights from Denver Intl Airport to Illinois?
The number of operators available for flights from Denver Intl Airport to Illinois is 7 as of March 2026.
How old do you have to be to fly from Denver Intl Airport to Illinois?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Denver 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 Denver to Illinois?
momondo data reveals that the most frequently booked plane model on the route from Denver to Illinois is Airbus A321neo, representing 16.06% of all bookings. The subsequent popular models are Boeing 737-800 at 11.74%, Boeing 757-300 at 11.04%, and Boeing 737-900 at 8.84%.

Best airlines flying from Denver to Illinois

Compare and see reviews for airlines that fly from Denver to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Allegiant Air	PriceFrom $57	Free Cancellation	Rating 7.3 717 reviews	Search Allegiant Air flights
Frontier	PriceFrom $70	Free Cancellation	Rating 5.7 3,039 reviews	Search Frontier flights
JetBlue	PriceFrom $126	Free Cancellation	Rating 7.2 2,895 reviews	Search JetBlue flights
Southwest	PriceFrom $155	Free Cancellation	Rating 8.0 4,311 reviews	Search Southwest flights
American Airlines	PriceFrom $157	Free Cancellation	Rating 7.1 11,395 reviews	Search American Airlines flights
United Airlines	PriceFrom $159	Free Cancellation	Rating 7.4 9,404 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Denver to Illinois?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Denver to Illinois for you.

Can I find flights from Denver to Illinois with flexible booking policies on momondo?

momondo does allow users to show only those flights to Illinois from Denver which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Denver to Illinois?

Once all potential Denver to Illinois flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are not ready to book a flight from Denver to Illinois now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Illinois and let you know when they change.

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Cheap flights from Denver to Illinois from $42

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Denver to Illinois departing on 5/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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See travel insights to Illinois from

How to get the cheapest flight ticket from Denver 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?

What is the cheapest Denver Intl to Illinois flight route?

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

What cabin class options are available on Denver Intl to Illinois flights?

Can stopping save me money on Denver to Illinois flights?

What is the cheapest airline that flies from Denver Intl to Illinois?

What airlines fly to Illinois?

How many flights depart from Denver to Illinois on average per day?

How many flights depart from Denver to Illinois on average per week?

Cheap Denver to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Denver to Illinois

Best Price Found

Fastest flight time

Direct flights

Airports in Illinois

Best airlines flying from Denver to Illinois

Compare and see reviews for airlines that fly from Denver to Illinois with momondo

Why use momondo?

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

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According to popular flight searches on momondo this year

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