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

As of August 2025, 487 flights take off from Denver and land in Illinois each week. The most common flight departure day for this route is Fri, with 20% of weekly flights taking off on this day.

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

The number of flights available between Denver and Illinois is 69 per day as of August 2025. The most frequent departure time is 2:00PM, with 50% of daily flights leaving in the afternoon.

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

Frontier is the most popular carrier operating from Denver Intl to Illinois

What airlines fly to Illinois?

Frontier, United Airlines and American Airlines are the top three most popular airlines that fly to Illinois from Denver according to our data. Frontier is the first choice among our users, with 30% 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.

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 6 as of August 2025.

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.

$40 Cheap Flights from Denver to Illinois in 2025

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Find the cheapest flights from Denver to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

8:22 pm - 11:53 pmDEN-ORD

2h 31mnonstop

6:00 am - 7:41 amORD-DEN

2h 41mnonstop

$86Frontier

Find Deal

Thu, Oct 16 - Sun, Oct 19

8:30 pm - 11:59 pmDEN-ORD

2h 29mnonstop

6:00 am - 7:45 amORD-DEN

2h 45mnonstop

$92Frontier

Find Deal

Fri, Sep 19 - Mon, Sep 22

6:31 pm - 9:31 pmDEN-PIA

2h 00mnonstop

4:16 pm - 5:41 pmPIA-DEN

2h 25mnonstop

$109Allegiant Air

Find Deal

Fri, Aug 15 - Mon, Aug 18

5:24 pm - 8:24 pmDEN-PIA

2h 00mnonstop

3:18 pm - 4:34 pmPIA-DEN

2h 16mnonstop

$113Allegiant Air

Find Deal

Fri, Sep 5 - Mon, Sep 22

7:30 pm - 11:05 pmDEN-ORD

2h 35mnonstop

7:00 am - 8:40 amORD-DEN

2h 40mnonstop

$157Southwest

Find Deal

Tue, Sep 2 - Sat, Sep 6

8:45 pm - 12:05 amDEN-MDW

2h 20mnonstop

8:50 pm - 10:25 pmMDW-DEN

2h 35mnonstop

$159Southwest

Find Deal

Thu, Sep 18 - Tue, Sep 23

2:45 pm - 8:52 pmDEN-PIA

5h 07m1 stop

8:45 am - 10:26 amPIA-DEN

2h 41mnonstop

$219United Airlines

Find Deal

Sat, Aug 23 - Tue, Aug 26

11:18 am - 4:43 pmDEN-PIA

4h 25m1 stop

8:10 am - 2:37 pmPIA-DEN

7h 27m1 stop

$229United Airlines

Find Deal

Sat, Aug 23 - Tue, Aug 26

5:32 pm - 11:38 pmDEN-MLI

5h 06m1 stop

4:21 pm - 10:55 pmMLI-DEN

7h 34m1 stop

$249American Airlines

Find Deal

Sat, Aug 16 - Wed, Aug 20

5:27 pm - 11:50 pmDEN-MLI

5h 23m1 stop

5:37 pm - 11:20 pmMLI-DEN

6h 43m1 stop

$259American Airlines

Find Deal

Thu, Oct 30 - Sun, Nov 2

Frontier flights from Denver to Illinois

Our best Frontier deals on Denver to Illinois flight tickets

Frontier

Oct 16

DEN8:22 pmDenver Intl

2h 31m

ORD11:53 pmChicago O'Hare Intl

Oct 19

ORD6:00 amChicago O'Hare Intl

2h 41m

DEN7:41 amDenver Intl

$86

Find similar

Frontier

Sep 19

DEN8:30 pmDenver Intl

2h 29m

ORD11:59 pmChicago O'Hare Intl

Sep 22

ORD6:00 amChicago O'Hare Intl

2h 45m

DEN7:45 amDenver Intl

$92

Find similar

Frontier

Oct 16

DEN8:22 pmDenver Intl

2h 31m

ORD11:53 pmChicago O'Hare Intl

Oct 19

ORD6:00 amChicago O'Hare Intl

2h 41m

DEN7:41 amDenver Intl

$96

Find similar

Southwest flights from Denver to Illinois

Our best Southwest deals on Denver to Illinois flight tickets

Southwest

Sep 2

DEN7:30 pmDenver Intl

2h 35m

ORD11:05 pmChicago O'Hare Intl

Sep 6

ORD7:00 amChicago O'Hare Intl

2h 40m

DEN8:40 amDenver Intl

$157

Find similar

Southwest

Sep 18

DEN8:45 pmDenver Intl

2h 20m

MDW12:05 amChicago Midway

Sep 23

MDW8:50 pmChicago Midway

2h 35m

DEN10:25 pmDenver Intl

$159

Find similar

Southwest

Sep 25

DEN8:45 pmDenver Intl

2h 20m

MDW12:05 amChicago Midway

Sep 29

MDW7:10 amChicago Midway

2h 35m

DEN8:45 amDenver Intl

$161

Find similar

Fly from

Fly to

Route

Depart

Return

Price

DenverChicago

DEN - ORD

DENORD

Denver Intl

Thu 10/16

8:22 pm-11:53 pm

Nonstop2h 31m

Chicago O'Hare Intl

Sun 10/19

6:00 am-7:41 am

Nonstop2h 41m

$86

DenverChicago

DEN - ORD

DENORD

Denver Intl

Fri 9/19

8:30 pm-11:59 pm

Nonstop2h 29m

Chicago O'Hare Intl

Mon 9/22

6:00 am-7:45 am

Nonstop2h 45m

$92

DenverPeoria

DEN - PIA

DENPIA

Denver Intl

Fri 8/15

6:31 pm-9:31 pm

Nonstop2h 00m

Greater Peoria

Mon 8/18

4:16 pm-5:41 pm

Nonstop2h 25m

$109

DenverPeoria

DEN - PIA

DENPIA

Denver Intl

Fri 9/5

5:24 pm-8:24 pm

Nonstop2h 00m

Greater Peoria

Mon 9/22

3:18 pm-4:34 pm

Nonstop2h 16m

$113

DenverChicago

DEN - ORD

DENORD

Denver Intl

Tue 9/2

7:30 pm-11:05 pm

Nonstop2h 35m

Chicago O'Hare Intl

Sat 9/6

7:00 am-8:40 am

Nonstop2h 40m

$157

DenverChicago

DEN - MDW

DENMDW

Denver Intl

Thu 9/18

8:45 pm-12:05 am

Nonstop2h 20m

Chicago Midway

Tue 9/23

8:50 pm-10:25 pm

Nonstop2h 35m

$159

DenverPeoria

DEN - PIA

DENPIA

Denver Intl

Sat 8/23

2:45 pm-8:52 pm

1 stop5h 07m

Greater Peoria

Tue 8/26

8:45 am-10:26 am

Nonstop2h 41m

$219

DenverPeoria

DEN - PIA

DENPIA

Denver Intl

Sat 8/23

11:18 am-4:43 pm

1 stop4h 25m

Greater Peoria

Tue 8/26

8:10 am-2:37 pm

1 stop7h 27m

$229

DenverMoline

DEN - MLI

DENMLI

Denver Intl

Sat 8/16

5:32 pm-11:38 pm

1 stop5h 06m

Moline Quad-City

Wed 8/20

4:21 pm-10:55 pm

1 stop7h 34m

$249

DenverMoline

DEN - MLI

DENMLI

Denver Intl

Thu 10/30

5:27 pm-11:50 pm

1 stop5h 23m

Moline Quad-City

Sun 11/2

5:37 pm-11:20 pm

1 stop6h 43m

$259

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 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 September. Flight prices, which tend to average around $157, 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 September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $160.

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

The cheapest day to depart from Denver to Illinois is on a Friday when prices can be found for as low as $290. Flights from Denver to Illinois on a Sunday will generally be more expensive and average around $501. 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 $189. Flights at noon are often more expensive with an average ticket price of $638.

What is the cheapest Denver Intl to Illinois flight route?

Fly from Denver Intl to Chicago Midway 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 $226 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 $190 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	$40
Fastest flight time	1h 51m
Direct flights	Every day
Airports in Illinois	4 airports

The best one-way flight to Illinois from Denver in the past 72 hours is $40. The best round-trip flight deal from Denver to Illinois found on momondo in the last 72 hours is $86.

The fastest flight from Denver to Illinois takes 1h 51m

Direct flights go from Denver to Illinois every day.

There are 4 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Greater Peoria (PIA), Lambert-St Louis (STL)

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 6 as of August 2025.
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 Boeing 737-800 Passenger/BBJ2 (winglets), representing 10.59% of all bookings. The subsequent popular models are Airbus A321neo at 10.52%, Boeing 737-800 at 10.38%, and Boeing 737 MAX 8 at 9.67%.

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
Frontier	PriceFrom $56	Free Cancellation	Rating 5.8 3,237 reviews	Search Frontier flights
Allegiant Air	PriceFrom $84	Free Cancellation	Rating 7.2 702 reviews	Search Allegiant Air flights
American Airlines	PriceFrom $151	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Southwest	PriceFrom $154	Free Cancellation	Rating 8.0 4,246 reviews	Search Southwest flights
United Airlines	PriceFrom $162	Free Cancellation	Rating 7.4 8,905 reviews	Search United Airlines flights
Delta	PriceFrom $216	Free Cancellation	Rating 8.0 7,985 reviews	Search Delta 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.

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.

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Find better results for your trip to Illinois

Popular cities in Illinois

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Cheap flights from Denver to Illinois from $40

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 10/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Denver to Illinois

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Frontier flights from Denver to Illinois

Our best Frontier deals on Denver to Illinois flight tickets

Southwest flights from Denver to Illinois

Our best Southwest deals on Denver to Illinois flight tickets

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Use the filters below to find and compare flights from Denver to Illinois that are best for you.

See travel insights to Illinois from

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

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 Denver to Illinois during this time can be as low as $189. Flights at noon are often more expensive with an average ticket price of $638.

What is the cheapest Denver Intl to Illinois flight route?

Fly from Denver Intl to Chicago Midway for the best Denver Intl - Illinois flight prices

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

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.

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

Frontier is the most popular carrier operating from Denver Intl to Illinois

What airlines fly to Illinois?

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

The number of flights available between Denver and Illinois is 69 per day as of August 2025. The most frequent departure time is 2:00PM, with 50% of daily flights leaving in the afternoon.

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

As of August 2025, 487 flights take off from Denver and land in Illinois each week. The most common flight departure day for this route is Fri, with 20% of weekly flights taking off on this day.

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

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

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

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

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

What is the most popular plane model from Denver to 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?

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

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

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

I’m not ready to book a flight from Denver 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