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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$67 CHEAP FLIGHTS from Illinois to Denver

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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.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to Denver

Sat, Sep 27 - Tue, Sep 30

7:55 pm - 9:20 pmSTL-DEN

2h 25mnonstop

6:00 am - 9:06 amDEN-STL

2h 06mnonstop

$91Frontier

Find Deal

Tue, Sep 30 - Tue, Oct 7

7:55 pm - 9:20 pmSTL-DEN

2h 25mnonstop

6:00 am - 9:07 amDEN-STL

2h 07mnonstop

$92Frontier

Find Deal

Sat, Sep 13 - Tue, Sep 16

7:55 pm - 9:20 pmSTL-DEN

2h 25mnonstop

6:00 am - 9:06 amDEN-STL

2h 06mnonstop

$94Frontier

Find Deal

Fri, Oct 31 - Fri, Nov 7

4:29 pm - 5:45 pmPIA-DEN

2h 16mnonstop

5:50 pm - 8:47 pmDEN-PIA

1h 57mnonstop

$139Allegiant Air

Find Deal

Mon, Nov 3 - Fri, Nov 7

9:59 am - 11:15 amPIA-DEN

2h 16mnonstop

5:50 pm - 8:47 pmDEN-PIA

1h 57mnonstop

$150Allegiant Air

Find Deal

Sat, Sep 20 - Mon, Sep 22

5:05 pm - 6:40 pmMDW-DEN

2h 35mnonstop

7:45 am - 11:05 amDEN-MDW

2h 20mnonstop

$163Southwest

Find Deal

Fri, Oct 31 - Fri, Nov 7

10:16 pm - 5:44 pmPIA-DEN

20h 28m1 stop

5:50 pm - 8:47 pmDEN-PIA

1h 57mnonstop

$193

Find Deal

Fri, Sep 19 - Tue, Sep 23

8:45 am - 10:26 amPIA-DEN

2h 41mnonstop

5:59 pm - 9:12 pmDEN-PIA

2h 13mnonstop

$209United Airlines

Find Deal

Fri, Oct 31 - Thu, Nov 6

4:29 pm - 5:45 pmPIA-DEN

2h 16mnonstop

11:04 am - 2:45 pmDEN-PIA

26h 41m1 stop

$210

Find Deal

Fri, Sep 19 - Tue, Sep 23

8:45 am - 10:26 amPIA-DEN

2h 41mnonstop

1:25 pm - 8:52 pmDEN-PIA

6h 27m1 stop

$219United Airlines

Find Deal

Useful Info

Low season	April
High season	August
Cheapest flight	$67

Best time to beat the crowds but there is an average 5% increase in price.

Most popular time to fly and prices are also 1% lower on average.

Flight from Chicago O'Hare Airport 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.

Dillon

Westminster

Lakewood

Broomfield

Englewood

Wheat Ridge

Central City

Greenwood Village

Lone Tree

Limon

Fort Morgan

Brighton

Evergreen

Erie

Everything you need to know for your flight to Denver

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in Denver

Denver (DEN)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

DEN

$67 Find Cheap Flights from Illinois to Denver

KAYAK searches hundreds of travel sites at once for deals on flights to Denver

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

Good to know

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?

Everything you need to know for your flight to Denver

Information on the airport you'll fly into in Denver

Cabin class types available on flights to Illinois

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

Find direct flights for Denver

Flights to other popular destinations

Flights from domestic origins to Denver

Choose which airport to fly into in Denver

Find deals for your return flight