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

As of July 2026, there are 615 flights per week flying from Illinois to Colorado. The most common day of the week flights depart is Fri, with 18% of flights taking off on this day.

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

As of July 2026, 87 flights take off from Illinois and land in Colorado each day. The most common flight departure time for this route is 10:00PM, with 38% of daily flights taking off in the evening.

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

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

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 19m on average. Another popular route from Illinois to Colorado is flying from Moline to Denver, which will take roughly 2h 29m. Keep in mind that layovers or delays could extend your travel time.

What airlines fly to Colorado?

United Airlines, American Airlines and Frontier 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 45% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 7 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

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 7 operators available for flights from Illinois to Colorado as of July 2026.

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.

$94 Cheap Flights from Illinois to Colorado in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Colorado

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:24 pm - 6:44 pm

PIA

DEN

2h 20mnonstop

11:15 am - 2:14 pm

DEN

PIA

1h 59mnonstop

$125Allegiant Air

Thu, Oct 1 - Sun, Oct 4

10:07 am - 11:26 am

PIA

DEN

2h 19mnonstop

2:26 pm - 5:29 pm

DEN

PIA

2h 03mnonstop

$126Allegiant Air

Sun, Aug 23 - Sun, Sep 13

4:57 pm - 9:03 am

STL

DEN

17h 06m

1 stop

11:59 pm - 5:22 pm

DEN

STL

16h 23m

1 stop

$142Frontier

Fri, Aug 14 - Wed, Aug 19

8:10 pm - 9:49 pm

STL

DEN

2h 39mnonstop

4:12 pm - 7:15 pm

DEN

STL

2h 03mnonstop

$146Frontier

Fri, Sep 11 - Mon, Sep 14

6:00 pm - 7:40 pm

MDW

DEN

2h 40mnonstop

4:55 pm - 8:15 pm

DEN

MDW

2h 20mnonstop

$205Southwest

Sat, Aug 22 - Mon, Aug 24

6:40 am - 8:10 am

MDW

DEN

2h 30mnonstop

1:55 pm - 7:25 pm

DEN

MDW

4h 30m

1 stop

$211Southwest

Tue, Aug 18 - Tue, Aug 18

10:56 am - 12:47 pm

ORD

COS

2h 51mnonstop

12:37 pm - 4:30 pm

COS

ORD

2h 53mnonstop

$243American Airlines

Wed, Aug 19 - Tue, Aug 25

10:56 am - 12:47 pm

ORD

COS

2h 51mnonstop

12:37 pm - 4:30 pm

COS

ORD

2h 53mnonstop

$244American Airlines

Thu, Aug 20 - Mon, Aug 24

5:00 am - 8:40 am

ORD

COS

4h 40m

1 stop

11:55 am - 3:38 pm

COS

ORD

2h 43mnonstop

$253United Airlines

Wed, Aug 12 - Wed, Aug 19

8:46 am - 10:33 am

ORD

COS

2h 47mnonstop

11:55 am - 3:38 pm

COS

ORD

2h 43mnonstop

$256United Airlines

Wed, Aug 12 - Wed, Aug 19

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Frontier flights from Illinois to Colorado

Our best Frontier deals on Illinois to Colorado flight tickets

Frontier

Aug 14

STL4:57 pmLambert-St Louis

17h 06m

1 stop

DEN9:03 amDenver Intl

Aug 19

DEN11:59 pmDenver Intl

16h 23m

1 stop

STL5:22 pmLambert-St Louis

$142

Frontier

Sep 11

STL8:10 pmLambert-St Louis

2h 39m

DEN9:49 pmDenver Intl

Sep 14

DEN4:12 pmDenver Intl

2h 03m

STL7:15 pmLambert-St Louis

$146

Frontier

Aug 6

STL8:08 pmLambert-St Louis

2h 36m

DEN9:44 pmDenver Intl

Aug 10

DEN4:10 pmDenver Intl

2h 13m

STL7:23 pmLambert-St Louis

$147

Delta flights from Illinois to Colorado

Our best Delta deals on Illinois to Colorado flight tickets

Delta

Aug 22

MDW1:25 pmChicago Midway

4h 58m

1 stop

DEN5:23 pmDenver Intl

Aug 23

DEN12:59 amDenver Intl

7h 18m

1 stop

MDW9:17 amChicago Midway

$225

Delta

Sep 29

MDW7:13 pmChicago Midway

5h 22m

1 stop

DEN11:35 pmDenver Intl

Oct 3

DEN6:05 amDenver Intl

5h 34m

1 stop

MDW12:39 pmChicago Midway

$247

Delta

Sep 4

MDW1:51 pmChicago Midway

7h 00m

1 stop

DEN7:51 pmDenver Intl

Sep 12

DEN10:55 amDenver Intl

5h 02m

1 stop

MDW4:57 pmChicago Midway

$255

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Thu 10/1

5:24 pm-6:44 pm

Nonstop2h 20m

Denver Intl

Sun 10/4

11:15 am-2:14 pm

Nonstop1h 59m

$125

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Sun 8/23

10:07 am-11:26 am

Nonstop2h 19m

Denver Intl

Sun 9/13

2:26 pm-5:29 pm

Nonstop2h 03m

$126

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Fri 8/14

4:57 pm-9:03 am

1 stop17h 06m

Denver Intl

Wed 8/19

11:59 pm-5:22 pm

1 stop16h 23m

$142

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Fri 9/11

8:10 pm-9:49 pm

Nonstop2h 39m

Denver Intl

Mon 9/14

4:12 pm-7:15 pm

Nonstop2h 03m

$146

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Sat 8/22

6:00 pm-7:40 pm

Nonstop2h 40m

Denver Intl

Mon 8/24

4:55 pm-8:15 pm

Nonstop2h 20m

$205

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Tue 8/18

6:40 am-8:10 am

Nonstop2h 30m

Denver Intl

Tue 8/18

1:55 pm-7:25 pm

1 stop4h 30m

$211

ChicagoColorado Springs

ORD - COS

ORDCOS

Chicago O'Hare Intl

Wed 8/19

10:56 am-12:47 pm

Nonstop2h 51m

Colorado Springs

Tue 8/25

12:37 pm-4:30 pm

Nonstop2h 53m

$243

ChicagoColorado Springs

ORD - COS

ORDCOS

Chicago O'Hare Intl

Thu 8/20

10:56 am-12:47 pm

Nonstop2h 51m

Colorado Springs

Mon 8/24

12:37 pm-4:30 pm

Nonstop2h 53m

$244

ChicagoColorado Springs

ORD - COS

ORDCOS

Chicago O'Hare Intl

Wed 8/12

5:00 am-8:40 am

1 stop4h 40m

Colorado Springs

Wed 8/19

11:55 am-3:38 pm

Nonstop2h 43m

$253

ChicagoColorado Springs

ORD - COS

ORDCOS

Chicago O'Hare Intl

Wed 8/12

8:46 am-10:33 am

Nonstop2h 47m

Colorado Springs

Wed 8/19

11:55 am-3:38 pm

Nonstop2h 43m

$256

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 October is, on average, the cheapest month to fly to Colorado from Illinois, with most prices found around $229. The month of November is another great option to travel to Colorado, with average flight prices from Illinois averaging around $238.

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 $263. On the other hand, Monday 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 $348.

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 evening when flights can be purchased for as low as $239. In the afternoon is when there is more demand to fly to Colorado, so prices are often more expensive at around $317 per ticket.

What is the cheapest Illinois to Colorado flight route?

Fly from Chicago O'Hare Intl to Denver Intl for the best Illinois - Colorado flight prices

How far in advance should I book a flight from Illinois 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 $249 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 $204 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	$147
Fastest flight time	2h 15m
Direct flights	Every day
Airports in Colorado	87 airports

The best one-way flight to Colorado from Illinois in the past 72 hours is $147. The best round-trip flight deal from Illinois to Colorado found on momondo in the last 72 hours is $239.

The fastest flight from Illinois to Colorado takes 2h 15m

Direct flights go from Illinois to Colorado every day.

There are 87 airports in Colorado. From Illinois there are direct flights to Colorado Springs (COS), Denver Intl (DEN).

Search flight deals

Frequently asked questions about flying 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 7 operators available for flights from Illinois to Colorado as of July 2026.
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 Boeing 737-800, making up 14.65% of the total bookings. Other popular models include Airbus A321neo with 13.84%, Airbus A321-100/200 with 11.57%, and Airbus A319 with 10.22%.

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
Allegiant Air	PriceFrom $51	Free Cancellation	Rating 7.3 683 reviews	Search Allegiant Air flights
Frontier	PriceFrom $69	Free Cancellation	Rating 5.6 2,792 reviews	Search Frontier flights
Delta	PriceFrom $105	Free Cancellation	Rating 7.8 8,480 reviews	Search Delta flights
Southwest	PriceFrom $142	Free Cancellation	Rating 8.0 4,241 reviews	Search Southwest flights
JetBlue	PriceFrom $145	Free Cancellation	Rating 7.1 3,010 reviews	Search JetBlue flights
American Airlines	PriceFrom $153	Free Cancellation	Rating 7.1 11,827 reviews	Search American Airlines flights
United Airlines	PriceFrom $167	Free Cancellation	Rating 7.4 10,005 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.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Mon 8/17

Mon 8/24

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Colorado

Popular cities

Other flights from Illinois

Other flights to Colorado

Airlines

Complete your trip

Feeling lucky

Popular cities in Colorado

Flights to New Yorkfrom $72

Flights to Los Angelesfrom $55

Flights to Orlandofrom $50

Flights to Miamifrom $65

Flights to Chicagofrom $50

Flights to San Franciscofrom $55

Flights to Las Vegasfrom $46

Flights to Washington, D.C.from $56

Flights to Bostonfrom $78

Flights to Atlantafrom $55

Flights to Fort Lauderdalefrom $61

Flights to Dallasfrom $82

Cheap flights from Illinois to Colorado from $92

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 8/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Illinois to Colorado

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

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

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

momondo Fare Finder

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

See travel insights to Colorado from

How to get the cheapest flight ticket from Illinois to Colorado

What is the cheapest month to fly to Colorado?

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?

What is the cheapest Illinois to Colorado flight route?

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

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

Can stopping save me money on Illinois to Colorado flights?

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

What airlines fly to Colorado?

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

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

How long is the flight from Illinois to Colorado?

Cheap Illinois to Colorado flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Airports in Colorado

Frequently asked questions about flying 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?

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

Illinois flight routes

According to popular flight searches on momondo this year

Colorado flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to Colorado

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Complete your trip to Colorado

Explore popular destinations other users love

According to popular flight searches on momondo this year