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 2022: compare Illinois to Denver flight prices with the expected peak season, weather and rainfall in Denver.
When is the cheapest time to fly from Illinois to Denver (IL - DEN)?

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

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

August can be a great time to fly to Denver from Illinois with a flight ticket averaging about $142. Cheapflights users have found deals in the month of August for as cheap as $37. The most expensive prices can be found in the month of December.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 20 days in advance, which can save you up to 7% on flights from Illinois to Denver compared to booking the week you need them. Waiting 20 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $126. For sooner than that we have options available in the next 3 days from $137.

Cheap flights from Illinois to Denver in May, June 2022

The best prices found for Illinois to DEN flights for May, June
18 May - 23 May
$142pp
BMI
Bloomington-Normal
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
BMI
Bloomington-Normal
20 May - 23 May
$155pp
PIA
Greater Peoria
Allegiant Air
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Allegiant Air
Non-Stop
PIA
Greater Peoria
27 Jun - 4 Jul
$160pp
BMI
Bloomington-Normal
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
BMI
Bloomington-Normal

Illinois to Denver 2022 flight deals

Cheap flights to Denver from Illinois found for this year
4 Jul - 11 Jul
$141pp
BMI
Bloomington-Normal
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
BMI
Bloomington-Normal
18 May - 23 May
$142pp
BMI
Bloomington-Normal
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
BMI
Bloomington-Normal
12 Sep - 16 Sep
$144pp
PIA
Greater Peoria
Allegiant Air
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Allegiant Air
Non-Stop
PIA
Greater Peoria

Non-stop flights to Denver from Illinois

Save time with Illinois to Denver direct flight deals
4 Jul - 11 Jul
$141pp
BMI
Bloomington-Normal
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
BMI
Bloomington-Normal
12 Sep - 16 Sep
$144pp
PIA
Greater Peoria
Allegiant Air
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Allegiant Air
Non-Stop
PIA
Greater Peoria
21 Oct - 24 Oct
$151pp
PIA
Greater Peoria
Allegiant Air
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Allegiant Air
Non-Stop
PIA
Greater Peoria

Last minute flights from Illinois to Denver

Late deals on round-trip flights to Denver from Illinois, departing today and this week
23 May - 25 May
$142pp
BMI
Bloomington-Normal
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
BMI
Bloomington-Normal
27 May - 30 May
$200pp
BMI
Bloomington-Normal
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
BMI
Bloomington-Normal
27 May - 2 Jun
$210pp
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis

One-way flights to Denver Intl from Illinois

The cheapest one-way flights from Illinois to Denver
4:43 pm - 2:37 pm
Spirit Airlines
1 Stop
22h 54m
STL - DEN
Spirit Airlines
$105
Gotogate
1:15 am - 2:54 am
United Airlines
Nonstop
2h 39m
ORD - DEN
United Airlines
$109
United
3:30 pm - 1:43 pm
Sun Country Air
1 Stop
23h 13m
ORD - DEN
Sun Country Air
$113
Tripmonster

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

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.

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

United Airlines, Frontier, and American 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.

Can I find flights from Illinois to Denver for under $200 on Cheapflights?

Yes, there are multiple flights from Illinois to Denver for under $200. The cheapest flight booked recently is on Frontier for just $141, but on average you can expect to pay $179.

Are there nonstop flights from Illinois to Denver for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Illinois to Denver under $200. A good price for a nonstop flight from Illinois to Denver is less than $175.

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, Tuesday, Wednesday, Thursday, Friday, Saturday.

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

On average 42 flights depart from Illinois to Denver per day.
Early Morning (Midnight to 6am) - 7% of flight departures
Morning (6am - Noon) - 24% of flight departures
Afternoon (Noon - 6pm) - 52% of flight departures
Evening (6pm - Midnight) - 17% of flight departures

How long is the flight from Illinois to Denver?

Airlines like Frontier, Allegiant Air, and United Airlines fly from Illinois to Denver in about 2h 13m. The time it takes to get you to your destination is usually consistent. Airlines will cover a distance of 891 mi. All flights are typically nonstop.

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

The cheapest airlines for a one-way flight from Illinois to Denver are Frontier ($53), Sun Country Air ($103), and Spirit Airlines ($105).

What are the most popular routes from Illinois to Denver?

While some choose either Chicago Midway - Denver Intl or Lambert-St Louis - Denver Intl, Chicago O'Hare Intl - Denver Intl is the most popular route from Illinois to Denver.

What are the most reliable airlines from Illinois to Denver?

The top 3 most reliable airlines when flying from Illinois to Denver are Qatar Airways (92%), LOT (87%) and Japan Airlines (86%).

What are the cheapest flights from Illinois to Denver?

While on average a flight from Illinois to Denver is generally $520, our data shows the cheapest flight currently is $109. When looking at the most popular route, (Chicago O'Hare Intl - Denver Intl), you can expect to pay $208 for that flight.

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

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

COVID Restrictions

View COVID Travel Restrictions for Denver, CO

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

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

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

COVID-19 testing requirements
Visitors from Illinois must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 1 day for RT-PCR (NAAT) and 1 day for Antigen (quick-test) before departing to Denver Intl.

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

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

Returning to Illinois from Denver Intl

COVID-19 testing requirements
Visitors from Denver Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 1 day for RT-PCR (NAAT) and 1 day for Antigen (quick-test) before departing to Illinois.

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

Hide COVID Travel Restrictions for Denver, CO

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 from Illinois to DEN
2h 18m
Average temperature for May in Denver
73.4 °F
Avg rainfall for May in Denver
1.9 ″

Airports servicing

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

Airports servicing Denver

Top 8 airlines flying from Illinois to Denver Intl

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
Juneyao Airlines
$14 $22 No cancel fee 66%

We couldn't confirm the COVID-19 safety measures taken by Juneyao Airlines. Please check directly on their website for additional information.

Spirit Airlines
$27 $127 No cancel fee 65%
Frontier
$50 $170 No cancel fee 62%
Allegiant Air
$62 $166 No cancel fee 88%
Delta
$67 $301 No cancel fee N/A
American Airlines
$78 $346 No cancel fee 71%
United Airlines
$88 $349 No cancel fee 69%
Denver Air Connection
$122 $250 No cancel fee N/A

We couldn't confirm the COVID-19 safety measures taken by Denver Air Connection. Please check directly on their website for additional information.

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