Cheap flights from Illinois (IL) to Denver (DEN)

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How to find the cheapest flight from
Illinois to Denver (DEN)

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

Travelers have found it’s best to book a flight 14 days in advance to save up to 12% 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 14 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 Denver 1-2 weeks in advance for as low as $88, or $106 for flights within the next 24 hours.

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

August is one of the best times of the year to fly to Denver from Illinois. Prices for August average $98 per person but you can even find prices for as low as $36. The most expensive prices can be found in the month of December. Opting for a August flight can save you 38% on your journey compared to booking in August

Cheap flights from Illinois to Denver in March, April 2021

14 Apr - 28 Apr
$34pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
20 Apr - 24 Apr
$35pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
20 Apr - 20 Apr
$39pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl

Illinois to Denver 2021 flight deals

5 May - 11 May
$34pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
20 Apr - 24 Apr
$35pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
15 May - 18 May
$36pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl

Non-stop flights to Denver from Illinois

5 May - 11 May
$34pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
20 Apr - 24 Apr
$35pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
15 May - 18 May
$36pp
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 Denver

17 Mar - 15 Apr
$53pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
15 Mar - 17 Mar
$54pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
16 Mar - 24 Mar
$59pp
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl

One-way flights to Denver from Illinois

9:35 am - 11:15 am
American Airlines
Nonstop
2h 40m
ORD - DEN
American Airlines
4:06 pm - 5:59 pm
United Airlines
Nonstop
2h 53m
ORD - DEN
United Airlines
$44
United
5:22 am - 6:52 pm
Spirit Airlines
1 Stop
14h 30m
ORD - DEN
Spirit Airlines
$47
mytrip.com

Related info for your journey

Flight FAQs

From Illinois to Denver

Are flight prices decreasing from Illinois to Denver 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 Denver 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.

What safety measures are being taken by airlines flying from Illinois to Denver Intl to control the spread of COVID-19?

Delta is one of the many airlines that have implemented additional safety measures to control the spread of COVID-19. Some of the new policies that have been implemented to accommodate travelers flying from Illinois to Denver Intl are improved sanitation, HEPA filters, mask requirements, social distance seating (for a limited time), and pre-flight testing for antibodies and symptoms. Policies will vary by airline.

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

United Airlines, Spirit Airlines, and Frontier are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

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

Yes, there are multiple flights from Illinois to Denver for under $100. The cheapest flight booked recently is on Frontier for just $34, but on average you can expect to pay $45.

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

Cheapflights has at least 20 direct flights from Illinois to Denver under $100. A good price for a nonstop flight from Illinois to Denver is less than $45.

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

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

What days are nonstop flights available from Illinois to Denver?

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

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

Major Airline, American Airlines and Delta are the most popular airlines when flying from Illinois to Denver.

What are the most popular routes from Illinois to Denver?

The most popular route from Illinois to Denver is Chicago O'Hare Intl - Denver Intl. You may also consider Chicago Midway - Denver Intl or Moline Quad-City - Denver Intl.

What are the cheapest Flights from Illinois to Denver?

The cheapest flight price from Illinois to Denver is $47. On average you can expect to pay $455. The most popular route, (Chicago O'Hare Intl - Denver Intl), can usually be booked for $37.

What are the most reliable airlines from Illinois to Denver?

No one likes to see their flight delayed. When booking a flight from Illinois to Denver consider choosing British Airways (100%), United Airlines (88%) or Air Canada (86%) as they are the most reliable in getting you off to your destination on time.

How long is the flight from Illinois to Denver?

There are many flights that can get you from Illinois to Denver in 2h 11m. Fly via Allegiant Air or Frontier to get the fastest option. Generally, flights for this route are nonstop.

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

Frontier, at $34, was found to be the cheapest airline from Illinois to Denver. An alternate airline flying to your destination would be Spirit Airlines.

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

$17 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Spirit Airlines and American Airlines, with prices starting from $24 and $30, respectively.

Departure points for flights from Illinois to Denver

Destination information for Denver

Flight duration
2h 36m
Average temperature for March in Denver
55.4 °F
Avg rainfall for March in Denver
0.9 ″

Airports servicing

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

Airports servicing Denver

Top 6 airlines flying from Illinois to Denver

Airline Cheapest Average Flexibility On-time COVID-19 safety
Spirit Airlines
$53 $155 No cancel fee 65%
Frontier
$39 $163 No cancel fee 62%
Delta
$82 $322 No cancel fee N/A
United Airlines
$53 $322 No cancel fee 69%
American Airlines
$60 $370 No cancel fee 71%
Southwest
$231 $382 No cancel fee 63%
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