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Cheap flights from Illinois to Denver from $94

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Denver departing on 1/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Illinois to Denver

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:35 am - 10:33 pm
STL
-
DEN
12h 58m
1 stop
Frontier Logo
4:12 pm - 7:15 pm
DEN
-
STL
2h 03mnonstop
$130Frontier
Sat, Oct 10 - Tue, Oct 13
Frontier Logo
8:10 pm - 9:39 pm
STL
-
DEN
2h 29mnonstop
Frontier Logo
10:50 pm - 11:17 am
DEN
-
STL
11h 27m
1 stop
$130Frontier
Wed, Sep 9 - Sat, Sep 12
Allegiant Air Logo
10:07 am - 11:27 am
PIA
-
DEN
2h 20mnonstop
Allegiant Air Logo
2:16 pm - 5:19 pm
DEN
-
PIA
2h 03mnonstop
$139Allegiant Air
Sun, Sep 6 - Thu, Sep 10
Allegiant Air Logo
10:07 am - 11:27 am
PIA
-
DEN
2h 20mnonstop
Allegiant Air Logo
2:16 pm - 5:19 pm
DEN
-
PIA
2h 03mnonstop
$146Allegiant Air
Sun, Sep 6 - Thu, Sep 10
United Airlines Logo
1:36 pm - 3:00 pm
STL
-
DEN
2h 24mnonstop
United Airlines Logo
5:30 pm - 8:36 pm
DEN
-
STL
2h 06mnonstop
$157United Airlines
Wed, Sep 23 - Tue, Sep 29
Southwest Logo
6:30 pm - 7:45 pm
STL
-
DEN
2h 15mnonstop
Southwest Logo
6:35 am - 9:35 am
DEN
-
STL
2h 00mnonstop
$157Southwest
Wed, Aug 26 - Wed, Sep 2
Southwest Logo
4:05 pm - 5:20 pm
STL
-
DEN
2h 15mnonstop
Southwest Logo
6:35 am - 9:35 am
DEN
-
STL
2h 00mnonstop
$157Southwest
Wed, Sep 9 - Wed, Sep 16
Multiple Airlines Logo
2:00 pm - 10:35 pm
STL
-
DEN
9h 35m
2 stops
Multiple Airlines Logo
9:00 am - 12:07 pm
DEN
-
STL
2h 07mnonstop
$184Multiple Airlines
Fri, Sep 11 - Sun, Sep 13
United Airlines Logo
1:36 pm - 3:00 pm
STL
-
DEN
2h 24mnonstop
United Airlines Logo
5:32 pm - 8:38 pm
DEN
-
STL
2h 06mnonstop
$187United Airlines
Thu, Sep 3 - Thu, Sep 10
Multiple Airlines Logo
4:00 pm - 11:14 pm
ORD
-
DEN
8h 14m
1 stop
Multiple Airlines Logo
8:55 pm - 12:23 am
DEN
-
ORD
2h 28mnonstop
$187Multiple Airlines
Sun, Sep 6 - Thu, Sep 10

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American Airlines flights from Illinois to Denver

Our best American Airlines deals on Illinois to Denver flight tickets
American Airlines
Sep 1
CMI11:41 amChampaign University-Willard
6h 12m
1 stop
DEN4:53 pmDenver Intl
Sep 9
DEN2:28 pmDenver Intl
5h 28m
1 stop
CMI8:56 pmChampaign University-Willard
$280
American Airlines
Sep 1
CMI11:41 amChampaign University-Willard
11h 34m
2 stops
DEN10:15 pmDenver Intl
Sep 9
DEN1:17 pmDenver Intl
7h 29m
1 stop
CMI9:46 pmChampaign University-Willard
$286
American Airlines
Sep 1
CMI11:41 amChampaign University-Willard
8h 57m
2 stops
DEN7:38 pmDenver Intl
Sep 9
DEN7:26 amDenver Intl
9h 44m
2 stops
CMI6:10 pmChampaign University-Willard
$291

Delta flights from Illinois to Denver

Our best Delta deals on Illinois to Denver flight tickets
Delta
Sep 24
MLI5:09 pmMoline Quad-City
7h 05m
1 stop
DEN11:14 pmDenver Intl
Sep 28
DEN12:50 amDenver Intl
8h 23m
1 stop
MLI10:13 amMoline Quad-City
$319
Delta
Sep 28
BMI4:32 pmBloomington-Normal
7h 42m
1 stop
DEN11:14 pmDenver Intl
Oct 5
DEN3:00 pmDenver Intl
6h 34m
1 stop
BMI10:34 pmBloomington-Normal
$334
Delta
Aug 15
BMI4:24 pmBloomington-Normal
7h 41m
1 stop
DEN11:05 pmDenver Intl
Aug 19
DEN7:19 amDenver Intl
7h 22m
1 stop
BMI3:41 pmBloomington-Normal
$349

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Denver that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 3, 2026.
Use the filters below to find and compare flights from Illinois to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 10/10

10:35 am-10:33 pm

1 stop12h 58m

Denver Intl

Tue 10/13

4:12 pm-7:15 pm

Nonstop2h 03m

$130

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 9/9

8:10 pm-9:39 pm

Nonstop2h 29m

Denver Intl

Sat 9/12

10:50 pm-11:17 am

1 stop11h 27m

$130

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Sun 9/6

10:07 am-11:27 am

Nonstop2h 20m

Denver Intl

Thu 9/10

2:16 pm-5:19 pm

Nonstop2h 03m

$139

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Sun 9/6

10:07 am-11:27 am

Nonstop2h 20m

Denver Intl

Thu 9/10

2:16 pm-5:19 pm

Nonstop2h 03m

$146

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 9/23

1:36 pm-3:00 pm

Nonstop2h 24m

Denver Intl

Tue 9/29

5:30 pm-8:36 pm

Nonstop2h 06m

$157
Quickest round-trip

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 8/26

6:30 pm-7:45 pm

Nonstop2h 15m

Denver Intl

Wed 9/2

6:35 am-9:35 am

Nonstop2h 00m

$157

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 9/9

4:05 pm-5:20 pm

Nonstop2h 15m

Denver Intl

Wed 9/16

6:35 am-9:35 am

Nonstop2h 00m

$157

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Fri 9/11

2:00 pm-10:35 pm

2 stops9h 35m

Denver Intl

Sun 9/13

9:00 am-12:07 pm

Nonstop2h 07m

$184

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Thu 9/3

1:36 pm-3:00 pm

Nonstop2h 24m

Denver Intl

Thu 9/10

5:32 pm-8:38 pm

Nonstop2h 06m

$187

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Sun 9/6

4:00 pm-11:14 pm

1 stop8h 14m

Denver Intl

Thu 9/10

8:55 pm-12:23 am

Nonstop2h 28m

$187

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Denver from

How to get the cheapest flight ticket from Illinois to Denver

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Denver?

The cheapest month to fly to Denver from Illinois is in October. Flight prices, which tend to average around $215, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in October, then you should wait until January to fly from Illinois, when ticket prices are also cheap, with an average price of $224.

What is the cheapest day to depart on your flight to Denver?

The cheapest day to depart on your flight to Denver is on a Wednesday when prices can be found for as low as $271. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Monday, with ticket prices averaging around $348.

What is the cheapest time of day to depart on your flight to Denver?

The cheapest time of day to fly to Denver is in the evening when flights can be purchased for as low as $243. Flights in the afternoon are often more expensive with an average ticket price of $307.

What is the cheapest Illinois to Denver Intl flight route?

Fly from Chicago O'Hare Intl to Denver Intl for the best Illinois - Denver Intl flight prices

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

You are more likely to see cheaper flights to Denver from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $252 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from Illinois for as low as $214 on momondo.

What cabin class options are available on Illinois to Denver flights?

There are 4 cabin classes available to choose from on Illinois to Denver flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Denver flights?

No. A direct flight is the cheapest option for a flight between Illinois to Denver.

Cheap Illinois to Denver flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Denver

Best Price Found

$148

Fastest flight time

2h 19m

Direct flights

Every day

Airports in Denver

1 airport
The best one-way flight to Denver from Illinois in the past 72 hours is $148. The best round-trip flight deal from Illinois to Denver found on momondo in the last 72 hours is $227.
The fastest flight from Illinois to Denver takes 2h 19m
Direct flights go from Illinois to Denver every day.
There is 1 airport in Denver. From Illinois there are direct flights to Denver Intl (DEN).
Search flight deals

Frequently asked questions about flying from Illinois to Denver

  • When did momondo last update prices for flights from Illinois to Denver Intl Airport?

    Prices for flights from Illinois to Denver Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Illinois to Denver Intl Airport?

  • How old do you have to be to fly from Illinois to Denver Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Denver Intl Airport.

  • What documentation or ID do you need to fly to Denver Intl Airport?

    The required travel and health documents for your Denver Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Denver Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Illinois to Denver?

Best airlines flying from Illinois to Denver

Compare and see reviews for airlines that fly from Illinois to Denver with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $68Free CancellationRating
5.6
2,737 reviews
Search Frontier flights
Allegiant AirPriceFrom $74Free CancellationRating
7.3
680 reviews
Search Allegiant Air flights
DeltaPriceFrom $105Free CancellationRating
7.8
8,482 reviews
Search Delta flights
JetBluePriceFrom $145Free CancellationRating
7.2
3,027 reviews
Search JetBlue flights
SouthwestPriceFrom $151Free CancellationRating
8.0
4,224 reviews
Search Southwest flights
American AirlinesPriceFrom $156Free CancellationRating
7.1
11,845 reviews
Search American Airlines flights
United AirlinesPriceFrom $168Free CancellationRating
7.4
10,058 reviews
Search United Airlines flights

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Breckenridge
Estes Park
Black Hawk
Aurora
Fort Collins
Westminster
Longmont
Boulder
Manitou Springs
Lakewood
Greeley
Keystone
Thornton
Cripple Creek
Centennial
Frisco
Englewood
Littleton
Winter Park
Copper Mountain

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Denver?

It is quick and easy to find Illinois to Denver flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Denver that suits you.

Can I find flights from Illinois to Denver with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Illinois to Denver flights to just show those with flexible booking policies.

How can momondo help me find flights from Illinois to Denver?

momondo helps you find the best flight between Illinois and Denver by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Illinois to Denver right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Denver from Illinois. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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