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Cheap flights from Denver to Illinois from $92

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Denver to Illinois departing on 7/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Denver to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Allegiant Air Logo
10:20 am - 1:19 pm
DEN
-
PIA
1h 59mnonstop
Allegiant Air Logo
5:24 pm - 6:44 pm
PIA
-
DEN
2h 20mnonstop
$152Allegiant Air
Thu, Oct 29 - Thu, Oct 29
Frontier Logo
4:10 pm - 7:23 pm
DEN
-
STL
2h 13mnonstop
Frontier Logo
8:08 pm - 9:44 pm
STL
-
DEN
2h 36mnonstop
$163Frontier
Wed, Jul 29 - Wed, Aug 5
Southwest Logo
8:25 pm - 11:45 pm
DEN
-
MDW
2h 20mnonstop
Southwest Logo
3:50 pm - 5:20 pm
MDW
-
DEN
2h 30mnonstop
$183Southwest
Thu, Aug 6 - Tue, Aug 11
Southwest Logo
8:25 pm - 11:45 pm
DEN
-
MDW
2h 20mnonstop
Southwest Logo
8:55 am - 12:55 pm
MDW
-
DEN
5h 00m
1 stop
$189Southwest
Thu, Aug 6 - Tue, Aug 11
Delta Logo
6:00 am - 1:10 pm
DEN
-
MDW
6h 10m
1 stop
Delta Logo
7:25 pm - 11:34 pm
MDW
-
DEN
5h 09m
1 stop
$197Delta
Wed, Aug 19 - Tue, Aug 25
Delta Logo
6:00 am - 1:10 pm
DEN
-
MDW
6h 10m
1 stop
Delta Logo
1:27 pm - 5:23 pm
MDW
-
DEN
4h 56m
1 stop
$204Delta
Wed, Aug 19 - Mon, Aug 24
United Airlines Logo
6:00 pm - 9:03 pm
DEN
-
MLI
2h 03mnonstop
United Airlines Logo
8:50 am - 10:30 am
MLI
-
DEN
2h 40mnonstop
$279United Airlines
Sat, Nov 14 - Wed, Nov 18
United Airlines Logo
6:00 pm - 9:03 pm
DEN
-
MLI
2h 03mnonstop
United Airlines Logo
3:52 pm - 9:46 pm
MLI
-
DEN
6h 54m
1 stop
$289United Airlines
Sat, Nov 14 - Tue, Nov 17
American Airlines Logo
8:13 am - 6:20 pm
DEN
-
MLI
9h 07m
2 stops
American Airlines Logo
11:23 am - 5:04 pm
MLI
-
DEN
6h 41m
1 stop
$294American Airlines
Sat, Nov 14 - Wed, Nov 18
American Airlines Logo
5:57 pm - 12:35 am
DEN
-
BMI
5h 38m
1 stop
American Airlines Logo
5:45 pm - 12:17 am
BMI
-
DEN
7h 32m
1 stop
$309American Airlines
Fri, Jul 17 - Mon, Jul 20

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Frontier flights from Denver to Illinois

Our best Frontier deals on Denver to Illinois flight tickets
Frontier
Jul 29
DEN4:10 pmDenver Intl
2h 13m
STL7:23 pmLambert-St Louis
Aug 5
STL8:08 pmLambert-St Louis
2h 36m
DEN9:44 pmDenver Intl
$163
Frontier
Jun 27
DEN3:41 pmDenver Intl
2h 12m
STL6:53 pmLambert-St Louis
Jun 30
STL8:08 pmLambert-St Louis
2h 36m
DEN9:44 pmDenver Intl
$166
Frontier
Aug 26
DEN4:12 pmDenver Intl
2h 11m
STL7:23 pmLambert-St Louis
Aug 30
STL6:33 pmLambert-St Louis
15h 25m
1 stop
DEN8:58 amDenver Intl
$167

United Airlines flights from Denver to Illinois

Our best United Airlines deals on Denver to Illinois flight tickets
United Airlines
Jul 1
DEN9:05 pmDenver Intl
2h 39m
ORD12:44 amChicago O'Hare Intl
Jul 8
ORD6:00 amChicago O'Hare Intl
2h 42m
DEN7:42 amDenver Intl
$217
United Airlines
Nov 14
DEN6:00 pmDenver Intl
2h 03m
MLI9:03 pmMoline Quad-City
Nov 17
MLI8:50 amMoline Quad-City
2h 40m
DEN10:30 amDenver Intl
$279
United Airlines
Nov 14
DEN6:00 pmDenver Intl
2h 03m
MLI9:03 pmMoline Quad-City
Nov 18
MLI3:52 pmMoline Quad-City
6h 54m
1 stop
DEN9:46 pmDenver Intl
$289

momondo Fare Finder

 
Customize your flight search to find flights from Denver to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated June 9, 2026.
Use the filters below to find and compare flights from Denver to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

DenverPeoria

DEN - PIA

DENPIA

Denver Intl

Thu 10/29

10:20 am-1:19 pm

Nonstop1h 59m

Greater Peoria

Thu 10/29

5:24 pm-6:44 pm

Nonstop2h 20m

$152

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 7/29

4:10 pm-7:23 pm

Nonstop2h 13m

Lambert-St Louis

Wed 8/5

8:08 pm-9:44 pm

Nonstop2h 36m

$163

DenverChicago

DEN - MDW

DENMDW

Denver Intl

Thu 8/6

8:25 pm-11:45 pm

Nonstop2h 20m

Chicago Midway

Tue 8/11

3:50 pm-5:20 pm

Nonstop2h 30m

$183

DenverChicago

DEN - MDW

DENMDW

Denver Intl

Thu 8/6

8:25 pm-11:45 pm

Nonstop2h 20m

Chicago Midway

Tue 8/11

8:55 am-12:55 pm

1 stop5h 00m

$189

DenverChicago

DEN - MDW

DENMDW

Denver Intl

Wed 8/19

6:00 am-1:10 pm

1 stop6h 10m

Chicago Midway

Tue 8/25

7:25 pm-11:34 pm

1 stop5h 09m

$197

DenverChicago

DEN - MDW

DENMDW

Denver Intl

Wed 8/19

6:00 am-1:10 pm

1 stop6h 10m

Chicago Midway

Mon 8/24

1:27 pm-5:23 pm

1 stop4h 56m

$204

DenverMoline

DEN - MLI

DENMLI

Denver Intl

Sat 11/14

6:00 pm-9:03 pm

Nonstop2h 03m

Moline Quad-City

Wed 11/18

8:50 am-10:30 am

Nonstop2h 40m

$279

DenverMoline

DEN - MLI

DENMLI

Denver Intl

Sat 11/14

6:00 pm-9:03 pm

Nonstop2h 03m

Moline Quad-City

Tue 11/17

3:52 pm-9:46 pm

1 stop6h 54m

$289

DenverMoline

DEN - MLI

DENMLI

Denver Intl

Sat 11/14

8:13 am-6:20 pm

2 stops9h 07m

Moline Quad-City

Wed 11/18

11:23 am-5:04 pm

1 stop6h 41m

$294

DenverBloomington

DEN - BMI

DENBMI

Denver Intl

Fri 7/17

5:57 pm-12:35 am

1 stop5h 38m

Bloomington-Normal

Mon 7/20

5:45 pm-12:17 am

1 stop7h 32m

$309

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from Denver to Illinois

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 month to fly to Illinois?

The cheapest month to fly to Illinois from Denver is in September. Flight prices, which tend to average around $227, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $227.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Denver to Illinois is on a Friday when prices can be found for as low as $308. Flights from Denver to Illinois on a Sunday will generally be more expensive and average around $512. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Denver to Illinois during this time can be as low as $235. Flights at noon are often more expensive with an average ticket price of $535.

What is the cheapest Denver Intl to Illinois flight route?

Fly from Denver Intl to Chicago O'Hare Intl for the best Denver Intl - Illinois flight prices

How far in advance should I book a flight from Denver to Illinois?

You are more likely to see cheaper flights to Illinois from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $274 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Denver for as low as $219 on momondo.

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

There are 4 cabin classes available to choose from on Denver to Illinois 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 Denver to Illinois flights?

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

Cheap Denver to Illinois flight deals and tips

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

Best Price Found

$139

Fastest flight time

1h 55m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from Denver in the past 72 hours is $139. The best round-trip flight deal from Denver to Illinois found on momondo in the last 72 hours is $268.
The fastest flight from Denver to Illinois takes 1h 55m
Direct flights go from Denver to Illinois every day.
There are 98 airports in Illinois. From Denver there are direct flights to Greater Peoria (PIA), Lambert-St Louis (STL), Moline Quad-City (MLI).
Search flight deals

Frequently asked questions about flying from Denver to Illinois

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

    Prices for flights from Denver Intl Airport to Illinois are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Denver Intl Airport to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Denver to Illinois?

Best airlines flying from Denver to Illinois

Compare and see reviews for airlines that fly from Denver to Illinois with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $75Free CancellationRating
5.6
2,902 reviews
Search Frontier flights
Allegiant AirPriceFrom $84Free CancellationRating
7.3
704 reviews
Search Allegiant Air flights
JetBluePriceFrom $126Free CancellationRating
7.1
2,979 reviews
Search JetBlue flights
SouthwestPriceFrom $157Free CancellationRating
7.9
4,240 reviews
Search Southwest flights
American AirlinesPriceFrom $167Free CancellationRating
7.1
11,640 reviews
Search American Airlines flights
United AirlinesPriceFrom $175Free CancellationRating
7.4
9,799 reviews
Search United Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Denver to Illinois for you.

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

momondo does allow users to show only those flights to Illinois from Denver which offer a flexible booking policy as well as other useful filters and features.

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

Once all potential Denver to Illinois flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are not ready to book a flight from Denver to Illinois now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Illinois and let you know when they change.

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1 adult
Thu 7/9
Thu 7/16
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