DEN

$91 Find Cheap Flights from Illinois to Denver - Compare and Save

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 8/28. 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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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

Mon, Aug 24 - Mon, Aug 31
Frontier Logo
6:17 pm - 9:19 am
STL
-
DEN
16h 02m
1 stop
Frontier Logo
4:00 pm - 7:13 pm
DEN
-
STL
2h 13mnonstop
$135Frontier
Thu, Oct 22 - Fri, Oct 30
Frontier Logo
8:10 pm - 9:49 pm
STL
-
DEN
2h 39mnonstop
Frontier Logo
4:12 pm - 7:15 pm
DEN
-
STL
2h 03mnonstop
$138Frontier
Wed, Sep 2 - Wed, Sep 16
Southwest Logo
8:50 pm - 10:05 pm
STL
-
DEN
2h 15mnonstop
Southwest Logo
8:35 am - 11:40 am
DEN
-
STL
2h 05mnonstop
$157Southwest
Tue, Sep 1 - Wed, Sep 9
Southwest Logo
7:00 am - 8:15 am
STL
-
DEN
2h 15mnonstop
Southwest Logo
6:35 am - 9:35 am
DEN
-
STL
2h 00mnonstop
$157Southwest
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
$159Allegiant Air
Thu, Aug 20 - Thu, Aug 27
Allegiant Air Logo
10:07 am - 11:26 am
PIA
-
DEN
2h 19mnonstop
Allegiant Air Logo
2:17 pm - 5:24 pm
DEN
-
PIA
2h 07mnonstop
$169Allegiant Air
Thu, Sep 10 - Tue, Sep 15
United Airlines Logo
1:36 pm - 3:00 pm
STL
-
DEN
2h 24mnonstop
United Airlines Logo
1:27 pm - 4:34 pm
DEN
-
STL
2h 07mnonstop
$172United Airlines
Tue, Sep 1 - Wed, Sep 9
American Airlines Logo
8:07 pm - 11:59 pm
STL
-
DEN
4h 52m
1 stop
American Airlines Logo
7:26 am - 2:44 pm
DEN
-
STL
6h 18m
1 stop
$177American Airlines
Mon, Aug 24 - Sat, Aug 29
United Airlines Logo
4:40 pm - 6:10 pm
STL
-
DEN
2h 30mnonstop
United Airlines Logo
1:27 pm - 4:34 pm
DEN
-
STL
2h 07mnonstop
$187United Airlines
Mon, Sep 21 - Mon, Sep 28
American Airlines Logo
10:30 pm - 12:17 am
ORD
-
DEN
2h 47mnonstop
American Airlines Logo
7:16 am - 10:58 am
DEN
-
ORD
2h 42mnonstop
$205American Airlines
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Good to know

Low season

April

Cheapest flight

$91
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly with an average 23% 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
Lakewood
Westminster
Dillon
Broomfield
Englewood
Greenwood Village
Lone Tree
Central City
Limon
Brighton
Wheat Ridge
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)