When did momondo last update prices for flights from Illinois to Denver Intl Airport?

Prices for flights from Illinois to Denver Intl Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Illinois to Denver Intl Airport?

As of November 2024, there are 6 operators available to choose from for flights from Illinois to Denver Intl Airport.

How old do you have to be to fly from Illinois to Denver Intl Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Denver Intl Airport.

What documentation or ID do you need to fly to Denver Intl Airport?

The required travel and health documents for your Denver Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Denver Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$36 Cheap Flights from Illinois to Denver in 2024/25

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Find the cheapest flights from Illinois to Denver

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Cheap round-trip flights

These are some of the best round-trip flight deals from Illinois to Denver that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from Illinois to Denver.

Cheap last minute flights

Planning a quick getaway from Illinois to Denver? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to Denver, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from Illinois to Denver

Find recent round-trip train or bus tickets from Illinois to Denver.

All round-trip flight deals to Denver

The cheapest plane tickets to Denver found on KAYAK recently.

7:09 pm - 8:37 pmSTL-DEN

2h 28mnonstop

8:44 am - 11:50 amDEN-STL

2h 06mnonstop

$56Frontier

Find Deal

Sat, Feb 8 - Tue, Feb 18

8:15 am - 10:07 amMDW-DEN

2h 52mnonstop

8:55 pm - 12:13 amDEN-MDW

2h 18mnonstop

$57Frontier

Find Deal

Wed, Jan 8 - Tue, Jan 14

10:08 am - 11:33 amPIA-DEN

2h 25mnonstop

12:23 pm - 3:22 pmDEN-PIA

1h 59mnonstop

$90Allegiant Air

Find Deal

Mon, Dec 9 - Fri, Dec 13

7:10 am - 9:00 amORD-DEN

2h 50mnonstop

8:50 pm - 12:22 amDEN-ORD

2h 32mnonstop

$157United Airlines

Find Deal

Sat, Dec 14 - Wed, Dec 18

5:10 pm - 6:40 pmSTL-DEN

2h 30mnonstop

7:10 am - 10:20 amDEN-STL

2h 10mnonstop

$158Southwest

Find Deal

Tue, Jan 14 - Sat, Jan 18

8:30 am - 10:21 amORD-DEN

2h 51mnonstop

1:00 pm - 4:35 pmDEN-ORD

2h 35mnonstop

$162American Airlines

Find Deal

Sat, Jan 25 - Sat, Jan 25

7:10 am - 9:00 amORD-DEN

2h 50mnonstop

8:29 pm - 11:59 pmDEN-ORD

2h 30mnonstop

$167United Airlines

Find Deal

Sat, Jan 18 - Tue, Jan 21

6:00 am - 10:34 amMLI-DEN

5h 34m1 stop

6:30 am - 4:03 pmDEN-MLI

8h 33m1 stop

$168American Airlines

Find Deal

Wed, Jan 22 - Sat, Jan 25

7:00 am - 8:45 amORD-DEN

2h 45mnonstop

6:20 am - 10:00 amDEN-ORD

2h 40mnonstop

$178Southwest

Find Deal

Fri, Dec 13 - Sat, Dec 14

4:24 pm - 5:49 pmPIA-DEN

2h 25mnonstop

6:39 pm - 9:38 pmDEN-PIA

1h 59mnonstop

$192Allegiant Air

Find Deal

Fri, Dec 20 - Mon, Dec 23

7:09 pm - 8:37 pmSTL-DEN

2h 28mnonstop

$36Frontier

Find Deal

Wed, Jan 22

12:21 pm - 2:11 pmORD-DEN

2h 50mnonstop

$38Frontier

Find Deal

Wed, Nov 20

8:45 am - 10:43 amORD-DEN

2h 58mnonstop

$79United Airlines

Find Deal

Sat, Dec 14

7:20 pm - 9:10 pmMDW-DEN

2h 50mnonstop

$79Southwest

Find Deal

Sat, Jan 11

5:10 pm - 6:40 pmSTL-DEN

2h 30mnonstop

$79Southwest

Find Deal

Tue, Jan 14

7:10 am - 9:00 amORD-DEN

2h 50mnonstop

$84United Airlines

Find Deal

Tue, Jan 14

8:30 am - 10:14 amORD-DEN

2h 44mnonstop

$90American Airlines

Find Deal

Sat, Dec 7

3:05 pm - 4:29 pmPIA-DEN

2h 24mnonstop

$91Allegiant Air

Find Deal

Wed, Nov 27

8:40 pm - 10:43 pmORD-DEN

3h 03mnonstop

$94American Airlines

Find Deal

Mon, Mar 3

3:18 pm - 4:42 pmPIA-DEN

2h 24mnonstop

$94Allegiant Air

Find Deal

Mon, Nov 25

9:45 am - 11:33 amMDW-DEN

2h 48mnonstop

9:45 am - 1:10 pmDEN-MDW

2h 25mnonstop

$93Frontier

Find Deal

Tue, Nov 19 - Thu, Nov 21

5:37 pm - 7:05 pmSTL-DEN

2h 28mnonstop

9:03 pm - 12:06 amDEN-STL

2h 03mnonstop

$102Frontier

Find Deal

Tue, Nov 19 - Sat, Nov 23

12:40 pm - 9:25 amORD-DEN

21h 45m1 stop

7:42 pm - 11:16 pmDEN-ORD

2h 34mnonstop

$327

Find Deal

Fri, Nov 15 - Tue, Nov 19

3:40 pm - 10:08 pmPIA-DEN

7h 28m1 stop

7:20 am - 3:14 pmDEN-PIA

6h 54m1 stop

$338American Airlines

Find Deal

Sat, Nov 16 - Tue, Nov 19

6:45 am - 12:40 pmPIA-DEN

6h 55m1 stop

6:00 am - 4:40 pmDEN-PIA

9h 40m2 stops

$343United Airlines

Find Deal

Sat, Nov 16 - Tue, Nov 19

6:45 am - 6:10 pmPIA-DEN

12h 25m2 stops

11:59 pm - 10:18 amDEN-PIA

9h 19m2 stops

$348United Airlines

Find Deal

Sat, Nov 16 - Tue, Nov 19

12:40 pm - 9:25 amORD-DEN

21h 45m1 stop

11:59 pm - 11:52 amDEN-ORD

10h 53m1 stop

$409

Find Deal

Fri, Nov 15 - Sun, Nov 17

4:00 pm - 5:45 pmORD-DEN

2h 45mnonstop

7:05 pm - 10:35 pmDEN-ORD

2h 30mnonstop

$414Southwest

Find Deal

Tue, Nov 19 - Fri, Nov 22

5:45 am - 6:00 pmORD-DEN

13h 15m2 stops

7:05 pm - 10:35 pmDEN-ORD

2h 30mnonstop

$428Southwest

Find Deal

Tue, Nov 19 - Fri, Nov 22

6:28 pm - 10:29 pmSPI-DEN

5h 01m1 stop

12:35 pm - 5:59 pmDEN-SPI

4h 24m1 stop

$462American Airlines

Find Deal

Fri, Nov 15 - Fri, Nov 22

7:09 pm - 8:37 pmSTL-DEN

2h 28mnonstop

8:44 am - 11:50 amDEN-STL

2h 06mnonstop

$56Frontier

Find Deal

Sat, Feb 8 - Tue, Feb 18

8:15 am - 10:07 amMDW-DEN

2h 52mnonstop

8:55 pm - 12:13 amDEN-MDW

2h 18mnonstop

$57Frontier

Find Deal

Wed, Jan 8 - Tue, Jan 14

10:08 am - 11:33 amPIA-DEN

2h 25mnonstop

12:23 pm - 3:22 pmDEN-PIA

1h 59mnonstop

$90Allegiant Air

Find Deal

Mon, Dec 9 - Fri, Dec 13

10:08 am - 11:33 amPIA-DEN

2h 25mnonstop

12:23 pm - 3:22 pmDEN-PIA

1h 59mnonstop

$95Allegiant Air

Find Deal

Mon, Dec 9 - Fri, Dec 13

7:10 am - 9:00 amORD-DEN

2h 50mnonstop

8:50 pm - 12:22 amDEN-ORD

2h 32mnonstop

$157United Airlines

Find Deal

Sat, Dec 14 - Wed, Dec 18

7:40 pm - 9:25 pmMDW-DEN

2h 45mnonstop

5:20 pm - 8:40 pmDEN-MDW

2h 20mnonstop

$158Southwest

Find Deal

Sat, Dec 14 - Tue, Dec 17

8:30 am - 10:21 amORD-DEN

2h 51mnonstop

1:00 pm - 4:35 pmDEN-ORD

2h 35mnonstop

$162American Airlines

Find Deal

Sat, Jan 25 - Sat, Jan 25

8:30 am - 10:14 amORD-DEN

2h 44mnonstop

4:10 pm - 7:44 pmDEN-ORD

2h 34mnonstop

$168American Airlines

Find Deal

Tue, Dec 10 - Tue, Dec 17

7:10 am - 9:00 amORD-DEN

2h 50mnonstop

7:45 am - 11:20 amDEN-ORD

2h 35mnonstop

$177United Airlines

Find Deal

Wed, Feb 5 - Sun, Feb 9

1:30 pm - 3:10 pmMDW-DEN

2h 40mnonstop

5:20 pm - 8:40 pmDEN-MDW

2h 20mnonstop

$177Southwest

Find Deal

Thu, Dec 12 - Tue, Dec 17

Frontier flights from Illinois to Denver

Our best Frontier deals on Illinois to Denver flight tickets

Frontier

Feb 8

STL7:09 pmLambert-St Louis

2h 28m

DEN8:37 pmDenver Intl

Feb 18

DEN8:44 amDenver Intl

2h 06m

STL11:50 amLambert-St Louis

$56

Find similar

Frontier

Dec 11

STL6:46 pmLambert-St Louis

2h 36m

DEN8:22 pmDenver Intl

Dec 18

DEN5:05 amDenver Intl

2h 08m

STL8:13 amLambert-St Louis

$57

Find similar

Frontier

Dec 11

STL6:46 pmLambert-St Louis

2h 36m

DEN8:22 pmDenver Intl

Dec 14

DEN5:05 amDenver Intl

2h 08m

STL8:13 amLambert-St Louis

$58

Find similar

Allegiant Air flights from Illinois to Denver

Our best Allegiant Air deals on Illinois to Denver flight tickets

Allegiant Air

Dec 9

PIA10:08 amGreater Peoria

2h 25m

DEN11:33 amDenver Intl

Dec 13

DEN12:23 pmDenver Intl

1h 59m

PIA3:22 pmGreater Peoria

$90

Find similar

Allegiant Air

Dec 20

PIA4:24 pmGreater Peoria

2h 25m

DEN5:49 pmDenver Intl

Dec 23

DEN6:39 pmDenver Intl

1h 59m

PIA9:38 pmGreater Peoria

$192

Find similar

Allegiant Air

Nov 27

PIA3:05 pmGreater Peoria

2h 24m

DEN4:29 pmDenver Intl

Dec 1

DEN5:50 pmDenver Intl

1h 59m

PIA8:49 pmGreater Peoria

$225

Find similar

How to get the cheapest flight ticket from Illinois to Denver

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies to Denver from Illinois?

Frontier. Frontier, Allegiant Air, and Southwest are the most popular carriers operating from Illinois to Denver

What is the cheapest Illinois to Denver flight route?

Lambert-St Louis - Denver Intl. Fly from Lambert-St Louis to Denver Intl for the best Illinois - Denver flight prices

What cabin class options are available on Illinois to Denver flights?

There are 3 cabin classes available to choose from on Illinois to Denver flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Denver flights?

No. A direct flight is the cheapest option for a flight between Illinois to Denver.

Cheap Illinois to Denver flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Denver

Best Price Found	$36
Fastest flight time	2h 24m
Direct flights	Every day
Airports in Denver	1 airport

The best one-way flight to Denver from Illinois in the past 72 hours is $36. The best round-trip flight deal from Illinois to Denver found on momondo in the last 72 hours is $56.

The fastest flight from Illinois to Denver takes 2h 24m

Direct flights go from Illinois to Denver every day.

There is 1 airport near Denver: Denver Intl (DEN)

Search flight deals

When did momondo last update prices for flights from Illinois to Denver Intl Airport?
Prices for flights from Illinois to Denver Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Illinois to Denver Intl Airport?
As of November 2024, there are 6 operators available to choose from for flights from Illinois to Denver Intl Airport.
How old do you have to be to fly from Illinois to Denver Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Denver Intl Airport.
What documentation or ID do you need to fly to Denver Intl Airport?
The required travel and health documents for your Denver Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Denver Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Illinois to Denver?
momondo data reveals that the most frequently booked plane model on the route from Illinois to Denver is Boeing 737-800, representing 11.62% of all bookings. The subsequent popular models are Airbus A320neo at 11.17%, Boeing 737 MAX 8 at 10.26%, and Airbus A321neo at 9.52%.

Best airlines flying from Illinois to Denver

Compare and see reviews for airlines that fly from Illinois to Denver with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $39	Free Cancellation	Rating 6.1 3,551 reviews	Search Frontier flights
Allegiant Air	PriceFrom $93	Free Cancellation	Rating 7.3 856 reviews	Search Allegiant Air flights
American Airlines	PriceFrom $139	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
United Airlines	PriceFrom $153	Free Cancellation	Rating 7.4 9,194 reviews	Search United Airlines flights
Southwest	PriceFrom $156	Free Cancellation	Rating 8.1 5,045 reviews	Search Southwest flights
Delta	PriceFrom $185	Free Cancellation	Rating 8.0 8,788 reviews	Search Delta flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Denver?

It is quick and easy to find Illinois to Denver flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Denver that suits you.

Can I find flights from Illinois to Denver with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Illinois to Denver flights to just show those with flexible booking policies.

How can momondo help me find flights from Illinois to Denver?

momondo helps you find the best flight between Illinois and Denver by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Illinois to Denver right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Denver from Illinois. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.