How long is the flight from Illinois to Colorado?

Flight times from Illinois to Colorado vary, but if you’re flying out of Peoria and flying into Denver (one of the most popular routes), then the duration is 2h 16m on average. Another popular route from Illinois to Colorado is flying from Moline to Denver, which will take roughly 2h 26m. Keep in mind that layovers or delays could extend your travel time.

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

As of July 2025, 64 flights take off from Illinois and land in Colorado each day. The most common flight departure time for this route is 8:00PM, with 36% of daily flights taking off at noon.

What airlines fly to Colorado?

United Airlines, Frontier and American Airlines are the top three most popular airlines that fly to Colorado from Illinois according to our data. United Airlines is the first choice among our users, with 34% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 6 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Illinois to Colorado?

Frontier is the most popular carrier operating from Illinois to Colorado

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

As of July 2025, there are 452 flights per week flying from Illinois to Colorado. The most common day of the week flights depart is Thu, with 24% of flights taking off on this day.

When did momondo last update prices for flights from Illinois to Colorado?

Prices for flights from Illinois to Colorado were last updated today.

How many operators does momondo search for flights from Illinois to Colorado?

There are 6 operators available for flights from Illinois to Colorado as of July 2025.

How old do you have to be to fly from Illinois to Colorado?

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 Illinois to Colorado.

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

The travel and health documents you'll need for your trip to Colorado 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 Colorado. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$35 Cheap Flights from Illinois to Colorado in 2025

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Find the cheapest flights from Illinois to Colorado

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

6:00 am - 7:41 amORD-DEN

2h 41mnonstop

8:22 pm - 11:53 pmDEN-ORD

2h 31mnonstop

$59Frontier

Find Deal

Thu, Oct 23 - Mon, Oct 27

4:29 pm - 6:17 pmMDW-DEN

2h 48mnonstop

7:10 pm - 10:38 pmDEN-MDW

2h 28mnonstop

$59Frontier

Find Deal

Thu, Oct 23 - Mon, Oct 27

3:18 pm - 4:34 pmPIA-DEN

2h 16mnonstop

5:24 pm - 8:24 pmDEN-PIA

2h 00mnonstop

$92Allegiant Air

Find Deal

Mon, Sep 8 - Fri, Sep 19

3:35 pm - 5:00 pmPIA-DEN

2h 25mnonstop

2:24 pm - 5:21 pmDEN-PIA

1h 57mnonstop

$113Allegiant Air

Find Deal

Fri, Nov 7 - Mon, Nov 10

8:00 am - 9:45 amMDW-DEN

2h 45mnonstop

7:20 pm - 10:40 pmDEN-MDW

2h 20mnonstop

$157Southwest

Find Deal

Tue, Oct 7 - Tue, Oct 14

5:55 am - 7:15 amSTL-DEN

2h 20mnonstop

5:15 pm - 8:15 pmDEN-STL

2h 00mnonstop

$157Southwest

Find Deal

Wed, Oct 8 - Wed, Oct 8

9:56 am - 11:51 amORD-COS

2h 55mnonstop

12:21 pm - 4:06 pmCOS-ORD

2h 45mnonstop

$216American Airlines

Find Deal

Sat, Sep 13 - Sat, Sep 20

9:50 am - 11:37 amORD-COS

2h 47mnonstop

12:25 pm - 4:10 pmCOS-ORD

2h 45mnonstop

$217American Airlines

Find Deal

Sat, Aug 30 - Wed, Sep 3

8:45 am - 10:26 amPIA-DEN

2h 41mnonstop

2:45 pm - 10:15 pmDEN-PIA

6h 30m1 stop

$219United Airlines

Find Deal

Wed, Aug 20 - Tue, Aug 26

3:40 pm - 9:59 pmMLI-DEN

7h 19m1 stop

5:39 pm - 8:53 pmDEN-MLI

2h 14mnonstop

$219United Airlines

Find Deal

Mon, Aug 25 - Sat, Aug 30

Frontier flights from Illinois to Colorado

Our best Frontier deals on Illinois to Colorado flight tickets

Frontier

Oct 23

ORD6:00 amChicago O'Hare Intl

2h 41m

DEN7:41 amDenver Intl

Oct 27

DEN8:22 pmDenver Intl

2h 31m

ORD11:53 pmChicago O'Hare Intl

$59

Find similar

Frontier

Oct 23

ORD6:00 amChicago O'Hare Intl

2h 41m

DEN7:41 amDenver Intl

Oct 27

DEN8:22 pmDenver Intl

2h 31m

ORD11:53 pmChicago O'Hare Intl

$68

Find similar

Frontier

Oct 7

ORD7:20 amChicago O'Hare Intl

2h 49m

DEN9:09 amDenver Intl

Oct 11

DEN8:22 pmDenver Intl

2h 31m

ORD11:53 pmChicago O'Hare Intl

$69

Find similar

Delta flights from Illinois to Colorado

Our best Delta deals on Illinois to Colorado flight tickets

Delta

Oct 21

ORD5:20 amChicago O'Hare Intl

7h 09m

1 stop

ASE11:29 amAspen Pitkin County

Oct 25

ASE7:21 amAspen Pitkin County

8h 39m

1 stop

ORD5:00 pmChicago O'Hare Intl

$233

Find similar

Delta

Aug 13

STL5:11 pmLambert-St Louis

6h 44m

1 stop

DEN10:55 pmDenver Intl

Aug 18

DEN12:59 amDenver Intl

6h 13m

1 stop

STL8:12 amLambert-St Louis

$237

Find similar

Delta

Aug 16

MLI4:59 pmMoline Quad-City

6h 56m

1 stop

DEN10:55 pmDenver Intl

Aug 23

DEN7:05 amDenver Intl

8h 14m

1 stop

MLI4:19 pmMoline Quad-City

$239

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Thu 10/23

6:00 am-7:41 am

Nonstop2h 41m

Denver Intl

Mon 10/27

8:22 pm-11:53 pm

Nonstop2h 31m

$59

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Thu 10/23

4:29 pm-6:17 pm

Nonstop2h 48m

Denver Intl

Mon 10/27

7:10 pm-10:38 pm

Nonstop2h 28m

$59

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Mon 9/8

3:18 pm-4:34 pm

Nonstop2h 16m

Denver Intl

Fri 9/19

5:24 pm-8:24 pm

Nonstop2h 00m

$92

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Fri 11/7

3:35 pm-5:00 pm

Nonstop2h 25m

Denver Intl

Mon 11/10

2:24 pm-5:21 pm

Nonstop1h 57m

$113

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Tue 10/7

8:00 am-9:45 am

Nonstop2h 45m

Denver Intl

Tue 10/14

7:20 pm-10:40 pm

Nonstop2h 20m

$157

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 10/8

5:55 am-7:15 am

Nonstop2h 20m

Denver Intl

Wed 10/8

5:15 pm-8:15 pm

Nonstop2h 00m

$157

ChicagoColorado Springs

ORD - COS

ORDCOS

Chicago O'Hare Intl

Sat 9/13

9:56 am-11:51 am

Nonstop2h 55m

Colorado Springs

Sat 9/20

12:21 pm-4:06 pm

Nonstop2h 45m

$216

ChicagoColorado Springs

ORD - COS

ORDCOS

Chicago O'Hare Intl

Sat 8/30

9:50 am-11:37 am

Nonstop2h 47m

Colorado Springs

Wed 9/3

12:25 pm-4:10 pm

Nonstop2h 45m

$217

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Wed 8/20

8:45 am-10:26 am

Nonstop2h 41m

Denver Intl

Tue 8/26

2:45 pm-10:15 pm

1 stop6h 30m

$219

MolineDenver

MLI - DEN

MLIDEN

Moline Quad-City

Mon 8/25

3:40 pm-9:59 pm

1 stop7h 19m

Denver Intl

Sat 8/30

5:39 pm-8:53 pm

Nonstop2h 14m

$219

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Illinois to Colorado

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 Colorado?

The month of November is, on average, the cheapest month to fly to Colorado from Illinois, with most prices found around $158. The month of September is another great option to travel to Colorado, with average flight prices from Illinois averaging around $159.

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

The cheapest day to depart from Illinois to Colorado is on a Saturday when prices can be found for as low as $246. On the other hand, Sunday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $300.

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

The cheapest time of day to fly to Colorado is in the afternoon when flights can be purchased for as low as $221. At noon is when there is more demand to fly to Colorado, so prices are often more expensive at around $312 per ticket.

What is the cheapest Illinois to Colorado flight route?

Fly from Greater Peoria to Denver Intl for the best Illinois - Colorado flight prices

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

You are more likely to see cheaper flights to Colorado from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Colorado for around $211 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Colorado from Illinois for as low as $175 on momondo.

What cabin class options are available on Illinois to Colorado flights?

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

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

Cheap Illinois to Colorado flight deals and tips

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

Best Price Found	$35
Fastest flight time	2h 16m
Direct flights	Every day
Airports in Colorado	1 airport

The best one-way flight to Colorado from Illinois in the past 72 hours is $35. The best round-trip flight deal from Illinois to Colorado found on momondo in the last 72 hours is $59.

The fastest flight from Illinois to Colorado takes 2h 16m

Direct flights go from Illinois to Colorado every day.

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

Search flight deals

When did momondo last update prices for flights from Illinois to Colorado?
Prices for flights from Illinois to Colorado were last updated today.
How many operators does momondo search for flights from Illinois to Colorado?
There are 6 operators available for flights from Illinois to Colorado as of July 2025.
How old do you have to be to fly from Illinois to Colorado?
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 Illinois to Colorado.
What documentation or ID do you need to fly to Colorado?
The travel and health documents you'll need for your trip to Colorado 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 Colorado. 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 Illinois to Colorado?
Based on momondo bookings for flights between Illinois and Colorado, the leading plane model is Airbus A321neo, making up 11.16% of the total bookings. Other popular models include Boeing 737-800 with 11.14%, Boeing 737 MAX 8 with 10.74%, and Boeing 737-800 Passenger/BBJ2 (winglets) with 8.19%.

Best airlines flying from Illinois to Colorado

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $52	Free Cancellation	Rating 5.9 3,239 reviews	Search Frontier flights
Allegiant Air	PriceFrom $83	Free Cancellation	Rating 7.2 702 reviews	Search Allegiant Air flights
American Airlines	PriceFrom $153	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Southwest	PriceFrom $157	Free Cancellation	Rating 8.0 4,246 reviews	Search Southwest flights
United Airlines	PriceFrom $158	Free Cancellation	Rating 7.4 8,900 reviews	Search United Airlines flights
Delta	PriceFrom $228	Free Cancellation	Rating 8.0 7,981 reviews	Search Delta flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to Colorado. momondo saves you time and could save you money on your trip.

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

Yes. momondo enables you to select and highlight flights to Colorado from Illinois with this policy.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Illinois to Colorado.

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

Yes momondo offers price alerts on flights to Colorado 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 Colorado 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 Colorado

Popular cities in Colorado

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Cheap flights from Illinois to Colorado from $35

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 Colorado departing on 9/30. 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

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Find the cheapest flights from Illinois to Colorado

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Frontier flights from Illinois to Colorado

Our best Frontier deals on Illinois to Colorado flight tickets

Delta flights from Illinois to Colorado

Our best Delta deals on Illinois to Colorado flight tickets

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

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How to get the cheapest flight ticket from Illinois to Colorado

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 Colorado?

The month of November is, on average, the cheapest month to fly to Colorado from Illinois, with most prices found around $158. The month of September is another great option to travel to Colorado, with average flight prices from Illinois averaging around $159.

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

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

The cheapest time of day to fly to Colorado is in the afternoon when flights can be purchased for as low as $221. At noon is when there is more demand to fly to Colorado, so prices are often more expensive at around $312 per ticket.

What is the cheapest Illinois to Colorado flight route?

Fly from Greater Peoria to Denver Intl for the best Illinois - Colorado flight prices

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

What cabin class options are available on Illinois to Colorado flights?

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

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

What is the cheapest airline that flies from Illinois to Colorado?

Frontier is the most popular carrier operating from Illinois to Colorado

What airlines fly to Colorado?

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

As of July 2025, 64 flights take off from Illinois and land in Colorado each day. The most common flight departure time for this route is 8:00PM, with 36% of daily flights taking off at noon.

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

As of July 2025, there are 452 flights per week flying from Illinois to Colorado. The most common day of the week flights depart is Thu, with 24% of flights taking off on this day.

How long is the flight from Illinois to Colorado?

Cheap Illinois to Colorado flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Colorado

When did momondo last update prices for flights from Illinois to Colorado?

How many operators does momondo search for flights from Illinois to Colorado?

How old do you have to be to fly from Illinois to Colorado?

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

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

Best airlines flying from Illinois to Colorado

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

Why use momondo?

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

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

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

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

An easier way to manage your Colorado 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 Colorado

Popular cities in Colorado

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