Cheap flights from Illinois (IL) to Colorado (CO)

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How to find the cheapest flight from
Illinois to Colorado

All the information you need to plan the best null to DEN flight in 2022: compare Illinois to Colorado flight prices with the expected peak season, weather and rainfall in Colorado.
What is the cheapest month to fly from Illinois to Colorado?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, August can be a great choice for travel to Colorado. Flights to Colorado from Illinois in August are about $142 on average during August, but can be found for as low as $37.

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

Travelers have found it’s best to book a flight 20 days in advance to save up to 7% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 20 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Illinois to Colorado 1-2 weeks in advance for as low as $126, or $137 for flights within the next 24 hours.

When is the cheapest time to fly from Illinois to Colorado (IL - CO)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Colorado as you normally would.

Cheap flights from Illinois to Colorado in January, February 2022

The best prices found for Illinois to Colorado flights for January, February
27 Feb - 4 Mar
$90pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
27 Feb - 5 Mar
$91pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
11 Feb - 18 Feb
$92pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl

Illinois to Colorado 2022 flight deals

Cheap flights to Colorado from Illinois found for this year
4 Mar - 8 Mar
$80pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
5 Mar - 8 Mar
$81pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
7 Mar - 9 Mar
$81pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

Non-stop flights to Colorado from Illinois

Save time with Illinois to Colorado direct flight deals
4 Mar - 8 Mar
$80pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
7 Mar - 9 Mar
$81pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
5 Mar - 8 Mar
$81pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl

Last minute flights from Illinois to Colorado

Late deals on round-trip flights to Colorado from Illinois, departing today and this week
2 Feb - 8 Feb
$98pp
ORD
Chicago O'Hare Intl
Spirit Airlines
 
1 STOP
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
2 Feb - 15 Feb
$100pp
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
DEN
Denver Intl
DEN
Denver Intl
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
3 Feb - 8 Feb
$101pp
ORD
Chicago O'Hare Intl
Multiple Airlines
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
 
1 STOP
ORD
Chicago O'Hare Intl

One-way flights to Colorado from Illinois

The cheapest one-way flights from Illinois to Colorado
6:21 am - 12:01 pm
Spirit Airlines
2 Stops
30h 40m
ORD - DEN
Spirit Airlines
$61
FareScan
3:15 am - 4:50 am
United Airlines
Nonstop
2h 35m
STL - DEN
United Airlines
$64
United
11:20 am - 7:35 pm
Frontier
1 Stop
9h 15m
STL - DEN
Frontier
$65
JustFly

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Illinois</span> to <span class="emphasized">Colorado</span> flights.

Flight FAQs

From Illinois to Colorado

Which airlines flying from Illinois to Colorado have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like United Airlines, Frontier, and Spirit Airlines flying from Illinois to Colorado have implemented new flexible cancellation policies.

Can I find flights from Illinois to Colorado for under $100 on Cheapflights?

Yes, there are multiple flights from Illinois to Colorado for under $100. The cheapest flight booked recently is on Frontier for just $80, but on average you can expect to pay $88.

Are there nonstop flights from Illinois to Colorado for under $100 on Cheapflights?

Cheapflights has at least 20 direct flights from Illinois to Colorado under $100. A good price for a nonstop flight from Illinois to Colorado is less than $91.

Are there last-minute flights available from Illinois to Colorado for under $100?

There are currently 20+ open flights from Illinois to Colorado within the next 7 days for less than $100.

What days are nonstop flights available from Illinois to Colorado?

Nonstop flights are available for this route on the following days: Sunday, Monday, Tuesday, Thursday, Friday, Saturday.

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

On average 38 flights depart from Illinois to Colorado per day.
Morning (6am - Noon) - 50% of flight departures
Afternoon (Noon - 6pm) - 18% of flight departures
Evening (6pm - Midnight) - 32% of flight departures

How long is the flight from Illinois to Colorado?

Airlines like Frontier and Spirit Airlines fly from Illinois to Colorado in about 3h 02m. The time it takes to get you to your destination can typically vary by up to 7h 08m. The distance between Illinois and Colorado is about 891 mi. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines to fly from Illinois to Colorado one-way?

One-way options have recently been found by users for as low as $37 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $49 and United Airlines from $64 one-way.

Related searches

Flights to Colorado from Illinois
Flights to Illinois Flights to Colorado

Rent a Car

Car Rentals in Colorado

COVID Restrictions

View COVID Travel Restrictions for Colorado (CO)

Do I need a COVID test to fly to Colorado from Illinois?

Information is based on travel restrictions for travel to Colorado within the United States

Most visitors from Illinois need to provide a negative COVID-19 test result and/or quarantine to enter Colorado.

COVID-19 testing requirements
Visitors from Illinois must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Colorado.

Quarantine requirements
Visitors from Illinois are not required to quarantine after entering Colorado.

Do I need a test to fly back to Illinois from Colorado?

Returning to Illinois from Colorado

COVID-19 testing requirements
Visitors from Colorado must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Illinois.

Quarantine requirements
Visitors from Colorado are not required to quarantine after entering Illinois.

Hide COVID Travel Restrictions for Colorado (CO)

Destination points for flights from Illinois to Colorado

Select to see more specific information for flights from Illinois to all places in Colorado.

Destination information for Colorado

Things to know before you go - useful duration and weather info for your trip from Illinois to Colorado.
Flight duration from Illinois to Colorado
2h 40m

Airports servicing

Bloomington (BMI)
Champaign (CMI)
Decatur (DEC)
Moline (MLI)
Marion (MWA)

Airports servicing

Colorado Springs (COS)
Denver (DEN)
Durango (DRO)
Vail Eagle County (EGE)
Loveland Northern Colorado (FNL)

Top 6 airlines flying from Illinois to Colorado

The chart below displays the airlines Cheapflights users traveling from Illinois to Colorado choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Frontier
$39 $171 No cancel fee 62%
Spirit Airlines
$53 $155 No cancel fee 65%
United Airlines
$53 $427 No cancel fee 69%
American Airlines
$60 $466 No cancel fee 71%
Delta
$82 $354 No cancel fee N/A
Southwest
$231 $382 No cancel fee 63%
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