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>

$53 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

Fri, Nov 7 - Mon, Nov 10

3:35 pm - 5:00 pmPIA-DEN

2h 25mnonstop

2:24 pm - 5:21 pmDEN-PIA

1h 57mnonstop

$103Allegiant Air

Find Deal

Fri, Sep 12 - Mon, Sep 15

3:18 pm - 4:34 pmPIA-DEN

2h 16mnonstop

5:24 pm - 8:24 pmDEN-PIA

2h 00mnonstop

$108Allegiant Air

Find Deal

Thu, Aug 7 - Mon, Aug 11

5:40 am - 7:30 amORD-DEN

2h 50mnonstop

8:31 pm - 12:10 amDEN-ORD

2h 39mnonstop

$116Frontier

Find Deal

Thu, Oct 23 - Wed, Oct 29

7:52 pm - 9:20 pmSTL-DEN

2h 28mnonstop

6:00 am - 9:07 amDEN-STL

2h 07mnonstop

$116Frontier

Find Deal

Mon, Aug 4 - Thu, Aug 14

6:45 pm - 8:05 pmSTL-DEN

2h 20mnonstop

5:30 am - 8:30 amDEN-STL

2h 00mnonstop

$157Southwest

Find Deal

Wed, Aug 27 - Sat, Aug 30

10:45 am - 12:15 pmMDW-DEN

2h 30mnonstop

7:25 pm - 10:50 pmDEN-MDW

2h 25mnonstop

$157Southwest

Find Deal

Fri, Oct 3 - Mon, Oct 6

5:10 pm - 6:54 pmORD-DEN

2h 44mnonstop

9:03 am - 12:37 pmDEN-ORD

2h 34mnonstop

$175American Airlines

Find Deal

Tue, Aug 12 - Sat, Aug 16

10:08 am - 3:48 pmSTL-DEN

6h 40m1 stop

11:59 pm - 8:06 amDEN-STL

7h 07m1 stop

$182American Airlines

Find Deal

Wed, Aug 6 - Fri, Aug 8

5:37 pm - 11:28 pmSTL-DEN

6h 51m1 stop

12:59 am - 8:59 amDEN-STL

7h 00m1 stop

$197Delta

Find Deal

Fri, Aug 29 - Tue, Sep 2

6:45 pm - 11:03 pmSTL-DEN

5h 18m1 stop

6:16 pm - 11:23 pmDEN-STL

4h 07m1 stop

$207Delta

Find Deal

Useful Info

Low season	April
High season	August
Cheapest flight	$53

Best time to beat the crowds but there is an average 8% increase in price.

Most popular time to fly and prices are also 10% lower on average.

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.

Evergreen

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

$53 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