How long does it take to fly to Denver?

Flight times vary depending on what airport in Illinois you fly out of and what airport in Denver you fly into. For example, flying from Peoria to Denver takes 2h 05m on average. On the other hand, flying from Chicago to Denver takes 2h 34m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo if there are any available for your route.

What airlines fly to Denver?

United Airlines, Frontier and American Airlines are the top three most popular airlines that fly to Denver from Illinois according to our data. United Airlines is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 5 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

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

As of November 2025, 61 flights take off from Illinois and land in Denver each day. The most common flight departure time for this route is 8:00PM, with 40% of daily flights taking off in the evening.

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

As of November 2025, there are 427 flights per week flying from Illinois to Denver. The most common day of the week flights depart is Thu, with 18% of flights taking off on this day.

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

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

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

Prices for flights from Illinois to Denver Intl Airport are refreshed on a daily basis.

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

As of November 2025, there are 6 operators available to choose from for flights from Illinois to Denver Intl Airport.

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

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Denver Intl Airport.

What documentation or ID do you need to fly to Denver Intl Airport?

The required travel and health documents for your Denver Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Denver Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$41 Cheap Flights from Illinois to Denver in 2025/26

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Cheap round-trip flights

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7:45 pm - 9:13 pmSTL-DEN

2h 28mnonstop

6:50 am - 10:02 amDEN-STL

2h 12mnonstop

$77Frontier

Find Deal

Wed, Nov 19 - Sat, Nov 29

7:45 pm - 9:13 pmSTL-DEN

2h 28mnonstop

6:50 am - 10:02 amDEN-STL

2h 12mnonstop

$78Frontier

Find Deal

Wed, Nov 19 - Mon, Nov 24

12:09 pm - 1:34 pmPIA-DEN

2h 25mnonstop

5:24 pm - 8:21 pmDEN-PIA

1h 57mnonstop

$125Allegiant Air

Find Deal

Mon, Nov 17 - Fri, Dec 5

9:22 pm - 9:55 amORD-DEN

13h 33m1 stop

8:45 pm - 12:12 amDEN-ORD

2h 27mnonstop

$125Multiple Airlines

Find Deal

Tue, Dec 2 - Fri, Dec 5

5:35 pm - 7:20 pmMDW-DEN

2h 45mnonstop

6:25 pm - 9:50 pmDEN-MDW

2h 25mnonstop

$133Southwest

Find Deal

Tue, Jan 20 - Fri, Jan 23

7:10 am - 8:55 amORD-DEN

2h 45mnonstop

8:30 pm - 11:59 pmDEN-ORD

2h 29mnonstop

$133United Airlines

Find Deal

Wed, Dec 3 - Wed, Dec 10

7:34 pm - 12:41 amORD-DEN

30h 07m2 stops

8:45 pm - 12:10 amDEN-ORD

2h 25mnonstop

$140Multiple Airlines

Find Deal

Wed, Nov 19 - Mon, Nov 24

2:20 pm - 7:30 pmMDW-DEN

6h 10m1 stop

6:25 pm - 9:50 pmDEN-MDW

2h 25mnonstop

$143Southwest

Find Deal

Tue, Jan 20 - Fri, Jan 23

3:33 pm - 4:57 pmPIA-DEN

2h 24mnonstop

5:24 pm - 8:21 pmDEN-PIA

1h 57mnonstop

$144Allegiant Air

Find Deal

Fri, Nov 21 - Fri, Dec 5

8:50 am - 9:55 amPIA-DEN

2h 05mnonstop

5:29 pm - 8:41 pmDEN-PIA

2h 12mnonstop

$209United Airlines

Find Deal

Wed, Mar 18 - Mon, Mar 23

Frontier flights from Illinois to Denver

Our best Frontier deals on Illinois to Denver flight tickets

Frontier

Nov 19

STL7:45 pmLambert-St Louis

2h 28m

DEN9:13 pmDenver Intl

Nov 29

DEN6:50 amDenver Intl

2h 12m

STL10:02 amLambert-St Louis

$77

Find similar

Frontier

Nov 19

STL7:45 pmLambert-St Louis

2h 28m

DEN9:13 pmDenver Intl

Nov 24

DEN6:50 amDenver Intl

2h 12m

STL10:02 amLambert-St Louis

$78

Find similar

Frontier

Jan 7

STL7:43 pmLambert-St Louis

2h 32m

DEN9:15 pmDenver Intl

Jan 7

DEN12:59 amDenver Intl

7h 48m

1 stop

STL9:47 amLambert-St Louis

$79

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Allegiant Air flights from Illinois to Denver

Our best Allegiant Air deals on Illinois to Denver flight tickets

Allegiant Air

Nov 17

PIA12:09 pmGreater Peoria

2h 25m

DEN1:34 pmDenver Intl

Dec 5

DEN5:24 pmDenver Intl

1h 57m

PIA8:21 pmGreater Peoria

$125

Find similar

Allegiant Air

Nov 21

PIA3:33 pmGreater Peoria

2h 24m

DEN4:57 pmDenver Intl

Dec 5

DEN5:24 pmDenver Intl

1h 57m

PIA8:21 pmGreater Peoria

$144

Find similar

Allegiant Air

Nov 17

PIA12:09 pmGreater Peoria

2h 25m

DEN1:34 pmDenver Intl

Dec 8

DEN5:24 pmDenver Intl

1h 57m

PIA8:21 pmGreater Peoria

$195

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 11/19

7:45 pm-9:13 pm

Nonstop2h 28m

Denver Intl

Sat 11/29

6:50 am-10:02 am

Nonstop2h 12m

$77

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 11/19

7:45 pm-9:13 pm

Nonstop2h 28m

Denver Intl

Mon 11/24

6:50 am-10:02 am

Nonstop2h 12m

$78

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Mon 11/17

12:09 pm-1:34 pm

Nonstop2h 25m

Denver Intl

Fri 12/5

5:24 pm-8:21 pm

Nonstop1h 57m

$125

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Tue 12/2

9:22 pm-9:55 am

1 stop13h 33m

Denver Intl

Fri 12/5

8:45 pm-12:12 am

Nonstop2h 27m

$125

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Tue 1/20

5:35 pm-7:20 pm

Nonstop2h 45m

Denver Intl

Fri 1/23

6:25 pm-9:50 pm

Nonstop2h 25m

$133

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Wed 12/3

7:10 am-8:55 am

Nonstop2h 45m

Denver Intl

Wed 12/10

8:30 pm-11:59 pm

Nonstop2h 29m

$133

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Wed 11/19

7:34 pm-12:41 am

2 stops30h 07m

Denver Intl

Mon 11/24

8:45 pm-12:10 am

Nonstop2h 25m

$140

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Tue 1/20

2:20 pm-7:30 pm

1 stop6h 10m

Denver Intl

Fri 1/23

6:25 pm-9:50 pm

Nonstop2h 25m

$143

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Fri 11/21

3:33 pm-4:57 pm

Nonstop2h 24m

Denver Intl

Fri 12/5

5:24 pm-8:21 pm

Nonstop1h 57m

$144

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Wed 3/18

8:50 am-9:55 am

Nonstop2h 05m

Denver Intl

Mon 3/23

5:29 pm-8:41 pm

Nonstop2h 12m

$209

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How to get the cheapest flight ticket from Illinois to Denver

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 Denver?

The cheapest month to fly to Denver from Illinois is in November. Flight prices, which tend to average around $163, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in November, then you should wait until September to fly from Illinois, when ticket prices are also cheap, with an average price of $187.

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

The cheapest day to depart on your flight to Denver is on a Wednesday when prices can be found for as low as $230. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Sunday, with ticket prices averaging around $284.

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

The cheapest time of day to fly to Denver is in the morning when flights can be purchased for as low as $234. Flights at noon are often more expensive with an average ticket price of $277.

What is the cheapest Illinois to Denver Intl flight route?

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

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

You are more likely to see cheaper flights to Denver from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $216 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from Illinois for as low as $182 on momondo.

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

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

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

Cheap Illinois to Denver flight deals and tips

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

Best Price Found	$110
Fastest flight time	2h 05m
Direct flights	Every day
Airports in Denver	1 airport

The best one-way flight to Denver from Illinois in the past 72 hours is $110. The best round-trip flight deal from Illinois to Denver found on momondo in the last 72 hours is $149.

The fastest flight from Illinois to Denver takes 2h 05m

Direct flights go from Illinois to Denver every day.

There is 1 airport near Denver: Denver Intl (DEN)

Search flight deals

When did momondo last update prices for flights from Illinois to Denver Intl Airport?
Prices for flights from Illinois to Denver Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Illinois to Denver Intl Airport?
As of November 2025, there are 6 operators available to choose from for flights from Illinois to Denver Intl Airport.
How old do you have to be to fly from Illinois to Denver Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Denver Intl Airport.
What documentation or ID do you need to fly to Denver Intl Airport?
The required travel and health documents for your Denver Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Denver Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Illinois to Denver?
momondo data reveals that the most frequently booked plane model on the route from Illinois to Denver is Airbus A321neo, representing 15.12% of all bookings. The subsequent popular models are Boeing 737-800 at 12.28%, Boeing 737-900 at 8.72%, and Boeing 737 MAX 8 at 8.54%.

Best airlines flying from Illinois to Denver

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $58	Free Cancellation	Rating 5.8 3,116 reviews	Search Frontier flights
Allegiant Air	PriceFrom $76	Free Cancellation	Rating 7.2 697 reviews	Search Allegiant Air flights
American Airlines	PriceFrom $153	Free Cancellation	Rating 7.2 11,041 reviews	Search American Airlines flights
Southwest	PriceFrom $157	Free Cancellation	Rating 8.0 4,240 reviews	Search Southwest flights
United Airlines	PriceFrom $160	Free Cancellation	Rating 7.4 9,003 reviews	Search United Airlines flights

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Black Hawk

Aurora

Fort Collins

Keystone

Cripple Creek

Manitou Springs

Longmont

Boulder

Greeley

Lakewood

Thornton

Westminster

Winter Park

Copper Mountain

Silverthorne

Frisco

Centennial

Grand Lake

Why use momondo?

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

It is quick and easy to find Illinois to Denver flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Denver that suits you.

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

Yes. momondo allows you to filter the results for Illinois to Denver flights to just show those with flexible booking policies.

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

momondo helps you find the best flight between Illinois and Denver by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes momondo offers price alerts on flights to Denver from Illinois. 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.

An easier way to manage your Denver trip

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Cheap flights from Illinois to Denver from $41

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Denver departing on 12/20. 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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Filter for what you want

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Find the cheapest flights from Illinois to Denver

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Frontier flights from Illinois to Denver

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Our best Allegiant Air deals on Illinois to Denver flight tickets

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How to get the cheapest flight ticket from Illinois to Denver

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 Denver?

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

The cheapest day to depart on your flight to Denver is on a Wednesday when prices can be found for as low as $230. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Sunday, with ticket prices averaging around $284.

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

The cheapest time of day to fly to Denver is in the morning when flights can be purchased for as low as $234. Flights at noon are often more expensive with an average ticket price of $277.

What is the cheapest Illinois to Denver Intl flight route?

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

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

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

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

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

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

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

What airlines fly to Denver?

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

As of November 2025, 61 flights take off from Illinois and land in Denver each day. The most common flight departure time for this route is 8:00PM, with 40% of daily flights taking off in the evening.

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

As of November 2025, there are 427 flights per week flying from Illinois to Denver. The most common day of the week flights depart is Thu, with 18% of flights taking off on this day.

How long does it take to fly to Denver?

Cheap Illinois to Denver flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Denver

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

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

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

What documentation or ID do you need to fly to Denver Intl Airport?

What is the most popular plane model from Illinois to Denver?

Best airlines flying from Illinois to Denver

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

Traveling to a place near Denver?

Why use momondo?

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

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

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

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

An easier way to manage your Denver 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 the United States

Airports servicing Colorado