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

As of October 2025, there are 197 flights per week flying from Illinois to Colorado. The most common day of the week flights depart is Thu, with 43% of flights taking off on this day.

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 05m on average. Another popular route from Illinois to Colorado is flying from Chicago to Denver, which will take roughly 2h 36m. Keep in mind that layovers or delays could extend your travel time.

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 36% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 5 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

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

As of October 2025, 28 flights take off from Illinois and land in Colorado each day. The most common flight departure time for this route is 6:00PM, with 39% of daily flights taking off in the evening.

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

Frontier, Allegiant Air, and United Airlines are the most popular carriers operating from Illinois to Colorado

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 October 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.

$42 Cheap Flights from Illinois to Colorado in 2025/26

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Find the cheapest flights from Illinois to Colorado

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:43 pm - 9:15 pmSTL-DEN

2h 32mnonstop

6:50 am - 10:02 amDEN-STL

2h 12mnonstop

$70Frontier

Find Deal

sáb., dic. 13 - sáb., dic. 20

3:30 pm - 11:04 pmSTL-DEN

8h 34m1 stop

7:05 am - 10:14 amDEN-STL

2h 09mnonstop

$82Frontier

Find Deal

mié., dic. 10 - sáb., dic. 13

3:08 pm - 4:34 pmPIA-DEN

2h 26mnonstop

5:24 pm - 8:21 pmDEN-PIA

1h 57mnonstop

$123Allegiant Air

Find Deal

vie., dic. 5 - vie., dic. 12

3:08 pm - 4:34 pmPIA-DEN

2h 26mnonstop

5:24 pm - 8:21 pmDEN-PIA

1h 57mnonstop

$127Allegiant Air

Find Deal

vie., dic. 5 - vie., dic. 12

5:40 am - 7:30 amMDW-DEN

2h 50mnonstop

5:25 am - 8:55 amDEN-MDW

2h 30mnonstop

$155Southwest

Find Deal

vie., feb. 6 - lun., feb. 9

9:15 am - 11:27 amORD-HDN

3h 12mnonstop

12:25 pm - 4:26 pmHDN-ORD

3h 01mnonstop

$189United Airlines

Find Deal

mar., dic. 23 - lun., dic. 29

9:15 am - 11:27 amORD-HDN

3h 12mnonstop

1:37 pm - 8:00 pmHDN-ORD

5h 23m1 stop

$195United Airlines

Find Deal

mar., dic. 23 - lun., dic. 29

9:50 am - 11:59 amORD-COS

3h 09mnonstop

12:30 pm - 4:07 pmCOS-ORD

2h 37mnonstop

$241American Airlines

Find Deal

dom., feb. 15 - jue., feb. 19

9:50 am - 11:59 amORD-COS

3h 09mnonstop

12:30 pm - 4:07 pmCOS-ORD

2h 37mnonstop

$243American Airlines

Find Deal

vie., feb. 20 - lun., feb. 23

1:45 pm - 9:55 pmORD-COS

9h 10m2 stops

6:05 am - 1:00 pmCOS-ORD

5h 55m1 stop

$278Southwest

Find Deal

jue., feb. 19 - sáb., feb. 21

Frontier flights from Illinois to Colorado

Our best Frontier deals on Illinois to Colorado flight tickets

Frontier

Dec 13

STL7:43 pmLambert-St Louis

2h 32m

DEN9:15 pmDenver Intl

Dec 20

DEN6:50 amDenver Intl

2h 12m

STL10:02 amLambert-St Louis

$70

Find similar

Frontier

Dec 10

STL3:30 pmLambert-St Louis

8h 34m

1 stop

DEN11:04 pmDenver Intl

Dec 13

DEN7:05 amDenver Intl

2h 09m

STL10:14 amLambert-St Louis

$82

Find similar

Frontier

Dec 6

STL7:43 pmLambert-St Louis

2h 32m

DEN9:15 pmDenver Intl

Dec 8

DEN11:59 pmDenver Intl

21h 34m

1 stop

STL10:33 pmLambert-St Louis

$83

Find similar

Allegiant Air flights from Illinois to Colorado

Our best Allegiant Air deals on Illinois to Colorado flight tickets

Allegiant Air

Dec 5

PIA3:08 pmGreater Peoria

2h 26m

DEN4:34 pmDenver Intl

Dec 12

DEN5:24 pmDenver Intl

1h 57m

PIA8:21 pmGreater Peoria

$123

Find similar

Allegiant Air

Dec 5

PIA3:08 pmGreater Peoria

2h 26m

DEN4:34 pmDenver Intl

Dec 12

DEN5:24 pmDenver Intl

1h 57m

PIA8:21 pmGreater Peoria

$127

Find similar

Allegiant Air

Dec 5

PIA3:08 pmGreater Peoria

2h 26m

DEN4:34 pmDenver Intl

Dec 12

DEN5:24 pmDenver Intl

1h 57m

PIA8:21 pmGreater Peoria

$128

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

sáb. 12/13

7:43 pm-9:15 pm

Nonstop2h 32m

Denver Intl

sáb. 12/20

6:50 am-10:02 am

Nonstop2h 12m

$70

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mié. 12/10

3:30 pm-11:04 pm

1 stop8h 34m

Denver Intl

sáb. 12/13

7:05 am-10:14 am

Nonstop2h 09m

$82

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

vie. 12/5

3:08 pm-4:34 pm

Nonstop2h 26m

Denver Intl

vie. 12/12

5:24 pm-8:21 pm

Nonstop1h 57m

$123

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

vie. 12/5

3:08 pm-4:34 pm

Nonstop2h 26m

Denver Intl

vie. 12/12

5:24 pm-8:21 pm

Nonstop1h 57m

$127

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

vie. 2/6

5:40 am-7:30 am

Nonstop2h 50m

Denver Intl

lun. 2/9

5:25 am-8:55 am

Nonstop2h 30m

$155

ChicagoHayden

ORD - HDN

ORDHDN

Chicago O'Hare Intl

mar. 12/23

9:15 am-11:27 am

Nonstop3h 12m

Hayden Yampa Valley

lun. 12/29

12:25 pm-4:26 pm

Nonstop3h 01m

$189

ChicagoHayden

ORD - HDN

ORDHDN

Chicago O'Hare Intl

mar. 12/23

9:15 am-11:27 am

Nonstop3h 12m

Hayden Yampa Valley

lun. 12/29

1:37 pm-8:00 pm

1 stop5h 23m

$195

ChicagoColorado Springs

ORD - COS

ORDCOS

Chicago O'Hare Intl

dom. 2/15

9:50 am-11:59 am

Nonstop3h 09m

Colorado Springs

jue. 2/19

12:30 pm-4:07 pm

Nonstop2h 37m

$241

ChicagoColorado Springs

ORD - COS

ORDCOS

Chicago O'Hare Intl

vie. 2/20

9:50 am-11:59 am

Nonstop3h 09m

Colorado Springs

lun. 2/23

12:30 pm-4:07 pm

Nonstop2h 37m

$243

ChicagoColorado Springs

ORD - COS

ORDCOS

Chicago O'Hare Intl

jue. 2/19

1:45 pm-9:55 pm

2 stops9h 10m

Colorado Springs

sáb. 2/21

6:05 am-1:00 pm

1 stop5h 55m

$278

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 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 $187.

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

The cheapest day to depart from Illinois to Colorado is on a Wednesday when prices can be found for as low as $238. 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 $283.

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 morning when flights can be purchased for as low as $244. 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 Chicago Midway 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 $216 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 $181 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	$106
Fastest flight time	2h 05m
Direct flights	Every day
Airports in Colorado	1 airport

The best one-way flight to Colorado from Illinois in the past 72 hours is $106. The best round-trip flight deal from Illinois to Colorado found on momondo in the last 72 hours is $143.

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

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 October 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 14.35% of the total bookings. Other popular models include Boeing 737-800 with 12.04%, Boeing 737 MAX 8 with 8.60%, and Boeing 737-900 with 8.52%.

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 $59	Free Cancellation	Rating 5.8 3,123 reviews	Search Frontier flights
Allegiant Air	PriceFrom $76	Free Cancellation	Rating 7.2 695 reviews	Search Allegiant Air flights
American Airlines	PriceFrom $152	Free Cancellation	Rating 7.2 11,030 reviews	Search American Airlines flights
Southwest	PriceFrom $157	Free Cancellation	Rating 8.0 4,242 reviews	Search Southwest flights
United Airlines	PriceFrom $160	Free Cancellation	Rating 7.4 8,998 reviews	Search United Airlines 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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sáb. 12/6

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Popular cities in Colorado

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Cheap flights from Illinois to Colorado 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 Illinois to Colorado 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.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

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

Allegiant Air flights from Illinois to Colorado

Our best Allegiant Air 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 $187.

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 morning when flights can be purchased for as low as $244. 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 Chicago Midway 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, Allegiant Air, and United Airlines are the most popular carriers operating from Illinois to Colorado

What airlines fly to Colorado?

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

As of October 2025, 28 flights take off from Illinois and land in Colorado each day. The most common flight departure time for this route is 6:00PM, with 39% of daily flights taking off in the evening.

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

As of October 2025, there are 197 flights per week flying from Illinois to Colorado. The most common day of the week flights depart is Thu, with 43% 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