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

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

All the information you need to plan the best DEN to ORD flight in 2021: compare Denver to Illinois flight prices with the expected peak season, weather and rainfall in Illinois.
What is the cheapest month to fly from Denver to Illinois?

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 Illinois. Flights to Illinois from Denver in August are about $133 on average during August, but can be found for as low as $35.

When is the cheapest time to fly from Denver to Illinois (DEN - IL)?

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

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

Users have found that booking a flight from Denver to Illinois at least 20 days early can save you up to 11% on average compared to booking a flight this week. If booking 20 days before your flight isn’t an option for you, users have found flights from Denver to Illinois for as little as $122 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $139 for flights departing within the next 3 days.

Cheap flights from Denver to Illinois in November, December 2021

The best prices found for DEN to Illinois flights for November, December
7 Dec - 11 Dec
$72pp
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
1 Dec - 4 Dec
$79pp
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
4 Dec - 4 Dec
$83pp
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl

Denver Intl to Illinois 2022 flight deals

Cheap flights to Illinois from Denver found for next year
7 Dec - 11 Dec
$72pp
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
1 Dec - 4 Dec
$79pp
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
4 Dec - 4 Dec
$83pp
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl

Non-stop flights to Illinois from Denver

Save time with Denver to Illinois direct flight deals
7 Dec - 11 Dec
$72pp
DEN
Denver Intl
Frontier
Non-Stop
STL
Lambert-St Louis
STL
Lambert-St Louis
Frontier
Non-Stop
DEN
Denver Intl
14 Dec - 15 Dec
$79pp
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
7 Dec - 14 Dec
$88pp
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl

Last minute flights from Denver to Illinois

Late deals on round-trip flights to Illinois from Denver, departing today and this week
1 Dec - 4 Dec
$79pp
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
4 Dec - 4 Dec
$83pp
DEN
Denver Intl
Frontier
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl
1 Dec - 4 Dec
$91pp
DEN
Denver Intl
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl

One-way flights to Illinois from Denver

The cheapest one-way flights from Denver to Illinois
6:09 am - 9:10 am
Allegiant Air
Nonstop
2h 01m
DEN - PIA
Allegiant Air
$48
FlightNetwork
2:00 am - 5:48 am
American Airlines
Nonstop
2h 48m
DEN - ORD
American Airlines
6:20 pm - 4:23 am
Spirit Airlines
1 Stop
9h 03m
DEN - ORD
Spirit Airlines
$66
FareScan

Related info for your journey

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

Flight FAQs

From Denver to Illinois

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

Most people fly from Denver Intl (DEN) if they book a flight from Denver to Illinois. Denver Intl is conveniently located just 18.5 mi from Denver’s city center.

Which airlines flying from Denver Intl to Illinois 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 Denver Intl to Illinois have implemented new flexible cancellation policies.

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

Yes, there are multiple flights from Denver to Illinois for under $100. The cheapest flight booked recently is on Frontier for just $79, but on average you can expect to pay $101.

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

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

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

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

What days are nonstop flights available from Denver to Illinois?

Nonstop flights can be found on the following days: Sunday, Monday, Tuesday, Wednesday, Friday, Saturday.

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

73 flight departures from Denver to Illinois per day on average.
Early Morning (Midnight to 6am) - 12% of flight departures
Morning (6am - Noon) - 52% of flight departures
Afternoon (Noon - 6pm) - 29% of flight departures
Evening (6pm - Midnight) - 7% of flight departures

How long is the flight from Denver to Illinois?

There are many flights that can get you from Denver to Illinois in 8h 52m. Fly via Frontier to get the fastest option. Denver and Illinois are separated by a distance of 891 mi.

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

$37 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 Frontier and Spirit Airlines, with prices starting from $43 and $53, respectively.

What are the cheapest flights from Denver to Illinois?

Looking at all options, your cheapest flight can be booked for $18. While the most popular route (Denver Intl - Chicago O'Hare Intl) can be booked for $79 on average our data indicates $347 when flying from Denver to Illinois.

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

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

What are the most reliable airlines from Denver to Illinois?

No one likes to see their flight delayed. When booking a flight from Denver to Illinois consider choosing Copa Airlines (100%), Turkish Airlines (94%) or Japan Airlines (90%) as they are the most reliable in getting you off to your destination on time.

What are the most popular routes from Denver to Illinois?

When deciding which route to take from Denver to Illinois consider Denver Intl - Chicago O'Hare Intl, Denver Intl - Chicago Midway or Denver Intl - Lambert-St Louis as they are the most popular.

COVID Restrictions

View COVID Travel Restrictions for Illinois (IL)

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

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

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

COVID-19 testing requirements
Visitors from Denver Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Illinois.

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

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

Returning to Denver Intl from Illinois

COVID-19 testing requirements
Visitors from Illinois must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Denver Intl.

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

Hide COVID Travel Restrictions for Illinois (IL)

Destination points for flights from Denver to Illinois

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

Destination information for Illinois

Things to know before you go - useful duration and weather info for your trip from Denver to Illinois.
Flight duration from DEN to Illinois
2h 27m

Airports servicing Denver

Airports servicing

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

Top 6 airlines flying from Denver Intl to Illinois

The chart below displays the airlines Cheapflights users traveling from Denver to Illinois 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
$48 $146 No cancel fee 62%
United Airlines
$50 $354 No cancel fee 69%
Spirit Airlines
$53 $148 No cancel fee 65%
American Airlines
$73 $351 No cancel fee 71%
Delta
$82 $338 No cancel fee N/A
Southwest
$246 $409 No cancel fee 63%
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