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Cheap flights from Colorado (CO) to Illinois (IL)

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How to find the cheapest flight from
Colorado to Illinois

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 37 days in advance, which can save you up to 10% on flights from Colorado to Illinois compared to booking the week you need them. Waiting 37 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 $177. For sooner than that we have options available in the next 3 days from $177.

Cheap flights from Colorado to Illinois in August, September 2020

The best prices found for Colorado to Illinois flights for August, September
12 Aug - 19 Aug
$31pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
12 Aug - 17 Aug
$32pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
26 Aug - 1 Sep
$33pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl

Colorado to Illinois 2020 flight deals

Cheap flights to Illinois from Colorado found for this year
12 Aug - 19 Aug
$31pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
12 Aug - 17 Aug
$32pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
26 Aug - 1 Sep
$33pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl

Non-stop flights to Illinois from Colorado

Save time with Colorado to Illinois direct flight deals
12 Aug - 19 Aug
$31pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
12 Aug - 17 Aug
$32pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
26 Aug - 1 Sep
$33pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
Non-Stop
DEN
Denver Intl

Last minute flights from Colorado to Illinois

Late deals on round-trip flights to Illinois from Colorado, departing today and this week
28 Jul - 30 Jul
$34pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
29 Jul - 2 Aug
$35pp
DEN
Denver Intl
Multiple Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
DEN
Denver Intl
25 Jul - 19 Sep
$39pp
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 Colorado

The cheapest one-way flights from Colorado to Illinois
1:53 am - 5:20 am
Major Airline
Nonstop
2h 27m
DEN - ORD
Major Airline
$33
StudentUniverse
6:04 am - 2:28 pm
Allegiant Air
1 Stop
7h 24m
DEN - ORD
Allegiant Air
$42
Ovago
8:20 am - 11:56 am
Spirit Airlines
Nonstop
2h 36m
DEN - ORD
Spirit Airlines
$49
FlightNetwork

Related info for your journey

Useful info, stats and facts about Colorado to Illinois flights.

Flight FAQs

From Colorado to Illinois

Are flight prices decreasing from Colorado to Illinois 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 Colorado and Illinois 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.

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

Yes, there are multiple flights from Colorado to Illinois for under $100. The cheapest flight booked recently is on Multiple Airlines for just $31, but on average you can expect to pay $42.

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

Cheapflights has at least 20 direct flights from Colorado to Illinois under $100. A good price for a nonstop flight from Colorado to Illinois is less than $43.

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

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

What days are nonstop flights available from Colorado to Illinois?

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

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

Consider Major Airline, American Airlines or Delta when booking your flight. These represent the most popular airlines when flying from Colorado to Illinois.

What are the most popular routes from Colorado to Illinois?

Most travelers choose Denver Intl - Chicago O'Hare Intl, Denver Intl - Chicago Midway or Colorado Springs - Chicago O'Hare Intl when deciding on the best route from Colorado to Illinois.

What are the cheapest Flights from Colorado to Illinois?

Looking at all options, your cheapest flight can be booked for $55. While the most popular route (Denver Intl - Chicago O'Hare Intl) can be booked for $30 on average our data indicates $141 when flying from Colorado to Illinois

What are the most reliable airlines from Colorado to Illinois?

Consider Japan Airlines (100%), Austrian Airlines (100%) or Copa Airlines (100%) when booking your flight. These represent the most reliable airlines when flying from Colorado to Illinois.

How long is the flight from Colorado to Illinois?

Allegiant Air and Spirit Airlines can get you from Colorado to Illinois in just under 2h 18m. Your travel time will be generally consistent. All flights are typically nonstop.

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

Currently priced at $34, Spirit Airlines will fly you from Colorado to Illinois and back. In addition to Spirit Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Allegiant Air for as low as $49.

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

For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $16. Users have also found prices from $23 and $42 on Spirit Airlines and Major Airline, respectively.

Destination information for Illinois

Things to know before you go. Useful info for your trip from Colorado to Illinois
Flight duration
2h 34m

Airports servicing

Colorado Springs (COS)
Denver (DEN)
Durango (DRO)
Eagle County Rgnl (EGE)
Grand Junction (GJT)

Airports servicing

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