How does KAYAK find such low prices on flights from Illinois to Denver?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Denver.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Denver?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to Denver?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Denver?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$68 CHEAP FLIGHTS from Illinois to Denver

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Cheap Flights from Illinois to Denver

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to Denver

Mon, Dec 14 - Thu, Dec 17

7:49 pm - 9:20 pmSTL Lambert-St Louis-DEN Denver Intl

2h 31mnonstop

6:10 am - 2:57 pmDEN Denver Intl-STL Lambert-St Louis

7h 47m1 stop Las Vegas Harry Reid Intl

$126Frontier

Sat, Oct 17 - Tue, Oct 20

7:42 pm - 9:09 pmSTL Lambert-St Louis-DEN Denver Intl

2h 27mnonstop

6:57 pm - 5:40 pmDEN Denver Intl-STL Lambert-St Louis

21h 43m1 stop Atlanta Hartsfield-Jackson

$127Frontier

Mon, Oct 19 - Thu, Oct 22

9:50 pm - 11:15 pmSTL Lambert-St Louis-DEN Denver Intl

2h 25mnonstop

5:50 am - 8:50 amDEN Denver Intl-STL Lambert-St Louis

2h 00mnonstop

$177Southwest

Sat, Oct 31 - Thu, Nov 5

10:05 am - 11:25 amSTL Lambert-St Louis-DEN Denver Intl

2h 20mnonstop

8:10 am - 11:15 amDEN Denver Intl-STL Lambert-St Louis

2h 05mnonstop

$177Southwest

Sat, Oct 3 - Mon, Oct 5

5:10 am - 6:43 amSTL Lambert-St Louis-DEN Denver Intl

2h 33mnonstop

8:28 pm - 11:44 pmDEN Denver Intl-STL Lambert-St Louis

2h 16mnonstop

$177United Airlines

Sat, Oct 10 - Wed, Oct 14

4:49 pm - 6:20 pmSTL Lambert-St Louis-DEN Denver Intl

2h 31mnonstop

1:30 pm - 4:37 pmDEN Denver Intl-STL Lambert-St Louis

2h 07mnonstop

$177United Airlines

Sat, Nov 14 - Tue, Nov 17

7:59 pm - 9:30 pmSTL Lambert-St Louis-DEN Denver Intl

2h 31mnonstop

10:39 am - 1:21 pmDEN Denver Intl-STL Lambert-St Louis

25h 42m2 stops Nashville Intl Jonesboro

$184Multiple Airlines

Mon, Nov 16 - Tue, Nov 17

7:59 pm - 9:30 pmSTL Lambert-St Louis-DEN Denver Intl

2h 31mnonstop

10:39 am - 1:21 pmDEN Denver Intl-STL Lambert-St Louis

25h 42m2 stops Nashville Intl Jonesboro

$184Multiple Airlines

Thu, Oct 8 - Mon, Oct 12

10:45 pm - 12:36 amORD Chicago O'Hare Intl-DEN Denver Intl

2h 51mnonstop

6:46 am - 10:30 amDEN Denver Intl-ORD Chicago O'Hare Intl

2h 44mnonstop

$229American Airlines

Sat, Dec 12 - Tue, Dec 15

10:35 pm - 12:26 amORD Chicago O'Hare Intl-DEN Denver Intl

2h 51mnonstop

2:27 pm - 6:10 pmDEN Denver Intl-ORD Chicago O'Hare Intl

2h 43mnonstop

$229American Airlines

Recent last minute flight deals from Illinois to Denver

Wed, Sep 16 - Wed, Oct 21

6:30 am - 8:15 amORD Chicago O'Hare Intl-DEN Denver Intl

2h 45mnonstop

8:55 pm - 12:24 amDEN Denver Intl-ORD Chicago O'Hare Intl

2h 29mnonstop

$186Frontier

Wed, Sep 16 - Wed, Oct 21

1:21 pm - 3:00 pmORD Chicago O'Hare Intl-DEN Denver Intl

26h 39m1 stop Las Vegas Harry Reid Intl

8:55 pm - 12:24 amDEN Denver Intl-ORD Chicago O'Hare Intl

2h 29mnonstop

$217Frontier

Wed, Sep 16 - Thu, Oct 15

6:40 am - 8:10 amMDW Chicago Midway-DEN Denver Intl

2h 30mnonstop

5:50 am - 9:10 amDEN Denver Intl-MDW Chicago Midway

2h 20mnonstop

$363Southwest

Wed, Sep 16 - Thu, Oct 15

11:10 am - 3:00 pmMDW Chicago Midway-DEN Denver Intl

4h 50m1 stop Dallas Love Field

5:50 am - 9:10 amDEN Denver Intl-MDW Chicago Midway

2h 20mnonstop

$369Southwest

Sat, Sep 19 - Sat, Sep 26

2:40 pm - 7:38 pmCMI Champaign University-Willard-DEN Denver Intl

5h 58m1 stop Dallas/Fort Worth

5:30 am - 2:10 pmDEN Denver Intl-CMI Champaign University-Willard

7h 40m1 stop Dallas/Fort Worth

$372American Airlines

Sat, Sep 19 - Sat, Sep 26

5:00 am - 12:27 pmCMI Champaign University-Willard-DEN Denver Intl

8h 27m2 stops Chicago O'Hare Intl Dallas/Fort Worth

6:26 am - 2:10 pmDEN Denver Intl-CMI Champaign University-Willard

6h 44m1 stop Dallas/Fort Worth

$378American Airlines

Sat, Sep 19 - Sat, Sep 26

8:45 am - 10:26 amPIA Greater Peoria-DEN Denver Intl

2h 41mnonstop

5:25 pm - 8:51 pmDEN Denver Intl-PIA Greater Peoria

2h 26mnonstop

$394United Airlines

Fri, Sep 18 - Fri, Sep 25

11:19 am - 4:15 pmMLI Moline Quad-City-DEN Denver Intl

5h 56m1 stop Atlanta Hartsfield-Jackson

12:50 am - 10:13 amDEN Denver Intl-MLI Moline Quad-City

8h 23m1 stop Atlanta Hartsfield-Jackson

$394Delta

Sat, Sep 19 - Sat, Sep 26

6:05 am - 12:45 pmPIA Greater Peoria-DEN Denver Intl

7h 40m1 stop Chicago O'Hare Intl

5:25 pm - 8:51 pmDEN Denver Intl-PIA Greater Peoria

2h 26mnonstop

$404United Airlines

Fri, Sep 18 - Tue, Sep 22

11:19 am - 7:05 pmMLI Moline Quad-City-DEN Denver Intl

8h 46m1 stop Atlanta Hartsfield-Jackson

7:15 am - 4:22 pmDEN Denver Intl-MLI Moline Quad-City

8h 07m1 stop Atlanta Hartsfield-Jackson

$429Delta

Useful Info

Low season	April
High season	July
Cheapest flight	$68

Best time to beat the crowds with an average 10% drop in price.

Most popular time to fly with an average 22% increase in price.

Flight from Peoria to Denver

How does KAYAK find such low prices on flights from Illinois to Denver?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Denver.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Denver?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to Denver?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Denver?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Westminster

Lakewood

Dillon

Broomfield

Englewood

Greenwood Village

Lone Tree

Central City

Limon

Brighton

Wheat Ridge

Fort Morgan

Evergreen

Erie

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DEN

$68 Find Cheap Flights from Illinois to Denver - Compare and Save

Cheap Flights from Illinois to Denver

Recent round-trip flight deals from Illinois to Denver

Recent one-way flight deals from Illinois to Denver

Recent last minute flight deals from Illinois to Denver

Recent direct flight deals from Illinois to Denver

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Low season

High season

Cheapest flight

FAQs for booking flights from Illinois to Denver

Traveling to a place near Denver?

More options for your flight to Denver

Complete your trip to Denver with a hotel stay or car rental

Information on the airport you'll fly into in Denver

Cabin class types available on flights to Illinois

Find direct flights for Denver

Flights from domestic origins to Denver

Flights to other popular destinations

Find deals for your return flight