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 2021: compare Illinois to Colorado flight prices with the expected peak season, weather and rainfall in Colorado.
How far in advance should I book a flight from Illinois to Colorado?

Find a great deal and save up to 12% by booking at least 14 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Illinois to Colorado within the next two weeks, with the cheapest ticket starting at $88.

What is the cheapest month to fly from Illinois to Colorado?

The best pricing can be found in the month of August. Prices to Colorado from Illinois average $98. You can even find prices in August for less than $98, as users have found deals to Colorado from as low as $36. The month of December appears to be one of the more expensive times to travel to Colorado from Illinois. Flying in the targeted month can save you up to 38%.

Cheap flights from Illinois to Colorado in May, June 2021

The best prices found for Illinois to Colorado flights for May, June
20 May - 22 May
$62pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
21 May - 22 May
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
17 May - 22 May
$67pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

Illinois to Colorado 2021 flight deals

Cheap flights to Colorado from Illinois found for this year
20 May - 22 May
$62pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
21 May - 22 May
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
17 May - 22 May
$67pp
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
20 May - 22 May
$62pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
21 May - 22 May
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
17 May - 22 May
$67pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

Last minute flights from Illinois to Colorado

Late deals on round-trip flights to Colorado from Illinois, departing today and this week
20 May - 22 May
$62pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
21 May - 22 May
$63pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
17 May - 22 May
$67pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

One-way flights to Colorado from Illinois

The cheapest one-way flights from Illinois to Colorado
6:39 pm - 8:23 pm
Spirit Airlines
Nonstop
2h 44m
ORD - DEN
Spirit Airlines
$52
Kiwi.com
10:40 am - 12:25 pm
United Airlines
Nonstop
2h 45m
ORD - DEN
United Airlines
$57
United
3:25 pm - 5:03 pm
American Airlines
Nonstop
2h 38m
ORD - DEN
American Airlines

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

Are flight prices decreasing from Illinois to Colorado due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Illinois and Colorado for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

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 $62, but on average you can expect to pay $77.

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 $77.

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 can be found on the following days: Sunday, Monday, Wednesday, Thursday, Friday, Saturday.

What are the most popular airlines that fly from Illinois to Colorado?

When booking a flight from Illinois to Colorado, you may want to consider flying on Major Airline, American Airlines or Delta as they are the most popular for this route.

What are the most popular routes from Illinois to Colorado?

The most popular flight routes from Illinois to Colorado are Chicago O'Hare Intl - Denver Intl, Chicago Midway - Denver Intl and Lambert-St Louis - Denver Intl.

What are the cheapest Flights from Illinois to Colorado?

The cheapest flight price from Illinois to Colorado is $42. On average you can expect to pay $467. The most popular route, (Chicago O'Hare Intl - Denver Intl), can usually be booked for $78.

What are the most reliable airlines from Illinois to Colorado?

The top 3 most reliable airlines when flying from Illinois to Colorado are Volaris (100%), Brussels Airlines (96%) and SAS (96%).

How long is the flight from Illinois to Colorado?

Airlines like Allegiant Air, United Airlines, and Frontier fly from Illinois to Colorado in about 2h 10m. The time it takes to get you to your destination is usually consistent. All flights are typically nonstop.

What are the cheapest airlines flying from Illinois to Colorado round-trip?

Cheapflights users have booked flights from Illinois to Colorado round-trip from $62. Another airline that can offer you cheap pricing is Spirit Airlines.

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

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $31. However, be on the lookout for offers from Spirit Airlines and American Airlines, as they are both options that can get you from Illinois to Colorado for a low price.

Related searches

Flights to Colorado from Illinois
Flights to Illinois Flights to Colorado

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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
2h 32m

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
Spirit Airlines
$53 $155 No cancel fee 65%
Frontier
$39 $171 No cancel fee 62%
Delta
$82 $354 No cancel fee N/A
Southwest
$231 $382 No cancel fee 63%
United Airlines
$53 $425 No cancel fee 69%
American Airlines
$60 $457 No cancel fee 71%
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