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

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

All the information you need to plan the best null to DEN flight in 2021: compare Illinois to Denver flight prices with the expected peak season, weather and rainfall in Denver.
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 June, July 2021

The best prices found for Illinois to DEN flights for June, July
3 Jul - 8 Jul
$106pp
ORD
Chicago O'Hare Intl
Spirit Airlines
 
1 STOP
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
4 Jul - 8 Jul
$110pp
ORD
Chicago O'Hare Intl
Spirit Airlines
 
1 STOP
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
19 Jul - 23 Jul
$113pp
BMI
Bloomington Bloomington-Normal
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
BMI
Bloomington Bloomington-Normal

Illinois to Denver 2021 flight deals

Cheap flights to Denver from Illinois found for this year
15 Sep - 18 Sep
$60pp
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
Non-Stop
ORD
Chicago O'Hare Intl
11 Sep - 18 Sep
$61pp
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
Non-Stop
ORD
Chicago O'Hare Intl
6 Oct - 12 Oct
$72pp
ORD
Chicago O'Hare Intl
Multiple Airlines
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl

Non-stop flights to Denver from Illinois

Save time with Illinois to Denver direct flight deals
15 Sep - 18 Sep
$60pp
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
Non-Stop
ORD
Chicago O'Hare Intl
11 Sep - 18 Sep
$61pp
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
Non-Stop
ORD
Chicago O'Hare Intl
6 Oct - 12 Oct
$72pp
ORD
Chicago O'Hare Intl
Multiple Airlines
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl

Last minute flights from Illinois to Denver

Late deals on round-trip flights to Denver from Illinois, departing today and this week
29 Jun - 3 Jul
$119pp
ORD
Chicago O'Hare Intl
Spirit Airlines
 
1 STOP
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
29 Jun - 30 Jun
$126pp
ORD
Chicago O'Hare Intl
Spirit Airlines
 
1 STOP
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
29 Jun - 3 Jul
$129pp
ORD
Chicago O'Hare Intl
Spirit Airlines
 
1 STOP
DEN
Denver Intl
DEN
Denver Intl
Spirit Airlines
 
1 STOP
ORD
Chicago O'Hare Intl

One-way flights to Denver from Illinois

The cheapest one-way flights from Illinois to Denver
4:00 am - 5:49 am
Frontier
Nonstop
2h 49m
ORD - DEN
Frontier
$71
JustFly

Related info for your journey

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

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.

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

Frontier, United Airlines, and Spirit Airlines 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.

What airport do you fly into for flights to Denver from Illinois?

For a flight from Illinois to Denver, you will be flying into Denver Intl. Denver Intl (DEN) is just 18.5 mi from the center of the city.

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 Spirit Airlines for just $60, but on average you can expect to pay $90.

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 $88.

Are there last-minute flights available from Illinois to Denver for under $200?

There are currently 20+ open flights from Illinois to Denver within the next 7 days for less than $200.

What days are nonstop flights available from Illinois to Denver?

Nonstop flights are available for this route on the following days: Sunday, Wednesday, Saturday.

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 Lambert-St Louis - Denver Intl.

What are the cheapest Flights from Illinois to Denver?

The cheapest flight price from Illinois to Denver 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 $61.

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 Copa Airlines (100%), Finnair (100%) or United Airlines (93%) 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 10m. 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?

Spirit Airlines, at $60, was found to be the cheapest airline from Illinois to Denver.Alternate airlines to your destination round-trip include Frontier and Allegiant Air.

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

$33 is the cheapest one-way deal found within the past few days, from Allegiant Air. You may also be able to find cheap deals on Spirit Airlines and Frontier, with prices starting from $36 and $47, respectively.

Departure points for flights from Illinois to Denver

Select to see more specific information for flights to Denver from all departure points in Illinois.

Destination information for Denver

Things to know before you go - useful duration and weather info for your trip from Illinois to Denver.
Flight duration
2h 33m
Average temperature for June in Denver
82.4 °F
Avg rainfall for June in Denver
1.8 ″

Airports servicing

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

Airports servicing Denver

Top 6 airlines flying from Illinois to Denver

The chart below displays the airlines Cheapflights users traveling from Illinois to Denver 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 $163 No cancel fee 62%
United Airlines
$53 $310 No cancel fee 69%
Delta
$82 $322 No cancel fee N/A
American Airlines
$60 $355 No cancel fee 71%
Southwest
$231 $382 No cancel fee 63%
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