DEN

$29 Find Cheap Flights from Illinois to Denver

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Denver departing on 2/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$73
Overall average: $197
Frontier
Wed 1/21Fri 1/23
STL - DEN • Non-stop
Cheapest one-way
$29
Typical prices: $78-$192
Frontier
Wed 2/4
STL - DEN • Non-stop
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Flight Deals
Useful Info
Flight Deals

Cheap Flights from Illinois to Denver

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Illinois to Denver

Wed, Jan 21 - Fri, Jan 23
Frontier Logo
3:46 pm - 5:23 pm
STL
-
DEN
2h 37mnonstop
Frontier Logo
3:38 pm - 6:44 pm
DEN
-
STL
2h 06mnonstop
$73Frontier
Mon, Jan 19 - Mon, Jan 26
Frontier Logo
7:36 pm - 9:08 pm
STL
-
DEN
2h 32mnonstop
Frontier Logo
9:41 am - 12:50 pm
DEN
-
STL
2h 09mnonstop
$80Frontier
Wed, Jan 14 - Fri, Jan 16
Multiple Airlines Logo
5:53 pm - 1:37 am
ORD
-
DEN
8h 44m1 stop
Multiple Airlines Logo
5:41 pm - 9:24 pm
DEN
-
ORD
2h 43mnonstop
$122Multiple Airlines
Sat, Jan 10 - Tue, Jan 13
United Airlines Logo
8:46 am - 10:35 am
MLI
-
DEN
2h 49mnonstop
United Airlines Logo
5:25 pm - 8:34 pm
DEN
-
MLI
2h 09mnonstop
$209United Airlines
Sun, Jan 11 - Tue, Jan 13
Multiple Airlines Logo
10:36 am - 12:21 pm
MLI
-
DEN
26h 45m2 stops
Multiple Airlines Logo
9:20 pm - 12:13 pm
DEN
-
MLI
13h 53m1 stop
$216Multiple Airlines
Fri, Jan 9 - Sun, Jan 11
United Airlines Logo
8:35 am - 10:20 am
PIA
-
DEN
2h 45mnonstop
United Airlines Logo
6:00 am - 12:38 pm
DEN
-
PIA
5h 38m1 stop
$219United Airlines
Fri, Jan 9 - Tue, Jan 13
Delta Logo
5:11 pm - 10:55 pm
MLI
-
DEN
6h 44m1 stop
Delta Logo
1:18 pm - 10:33 pm
DEN
-
MLI
8h 15m1 stop
$229Delta
Mon, Jan 19 - Mon, Jan 26
American Airlines Logo
5:16 pm - 11:16 pm
PIA
-
DEN
7h 00m1 stop
American Airlines Logo
4:30 pm - 10:21 pm
DEN
-
PIA
4h 51m1 stop
$249American Airlines
Fri, Feb 20 - Sun, Feb 22
American Airlines Logo
6:53 pm - 10:36 pm
PIA
-
DEN
4h 43m1 stop
American Airlines Logo
9:51 am - 6:22 pm
DEN
-
PIA
7h 31m1 stop
$268American Airlines
Sat, Feb 7 - Wed, Feb 11
Delta Logo
3:35 pm - 9:14 pm
BMI
-
DEN
6h 39m1 stop
Delta Logo
2:42 pm - 10:08 pm
DEN
-
BMI
6h 26m1 stop
$339Delta
Useful Info

Good to know

Low seasonNovember
Cheapest flight$29
Best time to beat the crowds but there is an average 1% increase in price.
Most popular time to fly with an average 3% increase in price.
Flight from St. Louis to Denver

FAQs for booking flights from Illinois 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.

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Dillon
Westminster
Lakewood
Broomfield
Englewood
Greenwood Village
Central City
Lone Tree
Wheat Ridge
Limon
Brighton
Fort Morgan
Evergreen
Erie

Everything you need to know for your flight to Denver

Information on the airport you'll fly into in Denver

Denver (DEN)