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Cheap flights from Denver to Illinois from $49

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 5/11. 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
0 bags

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Find the cheapest flights from Denver to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Allegiant Air Logo
2:17 pm - 5:24 pm
DEN
-
PIA
2h 07mnonstop
Allegiant Air Logo
10:07 am - 11:26 am
PIA
-
DEN
2h 19mnonstop
$106Allegiant Air
Thu, Aug 27 - Sun, Aug 30
Frontier Logo
4:15 pm - 7:23 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
9:18 pm - 3:25 am
STL
-
DEN
7h 07m
1 stop
$113Frontier
Sat, May 9 - Mon, May 11
Southwest Logo
11:05 am - 4:35 pm
DEN
-
MDW
4h 30m
1 stop
Southwest Logo
6:30 am - 8:10 am
MDW
-
DEN
2h 40mnonstop
$189Southwest
Tue, May 19 - Tue, May 26
Southwest Logo
2:20 pm - 7:50 pm
DEN
-
MDW
4h 30m
1 stop
Southwest Logo
6:00 am - 7:40 am
MDW
-
DEN
2h 40mnonstop
$195Southwest
Wed, May 27 - Sat, May 30
Multiple Airlines Logo
4:27 pm - 7:30 pm
DEN
-
PIA
2h 03mnonstop
Multiple Airlines Logo
9:06 pm - 8:08 am
PIA
-
DEN
12h 02m
1 stop
$241Multiple Airlines
Thu, May 28 - Sun, May 31
American Airlines Logo
3:11 pm - 10:01 pm
DEN
-
CMI
5h 50m
1 stop
American Airlines Logo
6:39 pm - 11:59 pm
CMI
-
DEN
6h 20m
1 stop
$270American Airlines
Sat, May 23 - Sat, May 30
United Airlines Logo
4:20 pm - 10:40 pm
DEN
-
CMI
5h 20m
1 stop
United Airlines Logo
7:34 pm - 11:49 pm
CMI
-
DEN
5h 15m
1 stop
$274United Airlines
Sat, Jul 11 - Sat, Jul 25
United Airlines Logo
5:38 pm - 8:54 pm
DEN
-
MLI
2h 16mnonstop
United Airlines Logo
6:34 pm - 11:37 pm
MLI
-
DEN
6h 03m
1 stop
$279United Airlines
Wed, May 27 - Wed, Jun 3
Multiple Airlines Logo
10:29 pm - 11:29 am
DEN
-
MLI
12h 00m
1 stop
Multiple Airlines Logo
5:47 pm - 8:24 am
MLI
-
DEN
15h 37m
1 stop
$283Multiple Airlines
Wed, May 6 - Sat, May 16
American Airlines Logo
6:10 am - 2:31 pm
DEN
-
CMI
7h 21m
1 stop
American Airlines Logo
6:55 pm - 12:06 am
CMI
-
DEN
6h 11m
1 stop
$328American Airlines
Fri, May 8 - Sun, May 10

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United Airlines flights from Denver to Illinois

Our best United Airlines deals on Denver to Illinois flight tickets
United Airlines
May 23
DEN4:40 pmDenver Intl
2h 44m
ORD8:24 pmChicago O'Hare Intl
May 30
ORD6:00 amChicago O'Hare Intl
2h 41m
DEN7:41 amDenver Intl
$205
United Airlines
Jun 3
DEN7:10 pmDenver Intl
2h 39m
ORD10:49 pmChicago O'Hare Intl
Jun 7
ORD10:55 pmChicago O'Hare Intl
2h 58m
DEN12:53 amDenver Intl
$212
United Airlines
Jul 11
DEN4:20 pmDenver Intl
5h 20m
1 stop
CMI10:40 pmChampaign University-Willard
Jul 25
CMI7:34 pmChampaign University-Willard
5h 15m
1 stop
DEN11:49 pmDenver Intl
$274

Frontier flights from Denver to Illinois

Our best Frontier deals on Denver to Illinois flight tickets
Frontier
May 16
DEN4:15 pmDenver Intl
2h 08m
STL7:23 pmLambert-St Louis
May 23
STL8:08 pmLambert-St Louis
2h 33m
DEN9:41 pmDenver Intl
$119
Frontier
May 30
DEN4:15 pmDenver Intl
2h 08m
STL7:23 pmLambert-St Louis
Jun 6
STL8:08 pmLambert-St Louis
2h 33m
DEN9:41 pmDenver Intl
$120
Frontier
May 28
DEN4:15 pmDenver Intl
2h 08m
STL7:23 pmLambert-St Louis
May 30
STL8:08 pmLambert-St Louis
2h 33m
DEN9:41 pmDenver Intl
$122

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 April 24, 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 8/27

2:17 pm-5:24 pm

Nonstop2h 07m

Greater Peoria

Sun 8/30

10:07 am-11:26 am

Nonstop2h 19m

$106

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 5/9

4:15 pm-7:23 pm

Nonstop2h 08m

Lambert-St Louis

Mon 5/11

9:18 pm-3:25 am

1 stop7h 07m

$113

DenverChicago

DEN - MDW

DENMDW

Denver Intl

Tue 5/19

11:05 am-4:35 pm

1 stop4h 30m

Chicago Midway

Tue 5/26

6:30 am-8:10 am

Nonstop2h 40m

$189

DenverChicago

DEN - MDW

DENMDW

Denver Intl

Wed 5/27

2:20 pm-7:50 pm

1 stop4h 30m

Chicago Midway

Sat 5/30

6:00 am-7:40 am

Nonstop2h 40m

$195

DenverPeoria

DEN - PIA

DENPIA

Denver Intl

Thu 5/28

4:27 pm-7:30 pm

Nonstop2h 03m

Greater Peoria

Sun 5/31

9:06 pm-8:08 am

1 stop12h 02m

$241

DenverChampaign

DEN - CMI

DENCMI

Denver Intl

Sat 5/23

3:11 pm-10:01 pm

1 stop5h 50m

Champaign University-Willard

Sat 5/30

6:39 pm-11:59 pm

1 stop6h 20m

$270

DenverChampaign

DEN - CMI

DENCMI

Denver Intl

Sat 7/11

4:20 pm-10:40 pm

1 stop5h 20m

Champaign University-Willard

Sat 7/25

7:34 pm-11:49 pm

1 stop5h 15m

$274

DenverMoline

DEN - MLI

DENMLI

Denver Intl

Wed 5/27

5:38 pm-8:54 pm

Nonstop2h 16m

Moline Quad-City

Wed 6/3

6:34 pm-11:37 pm

1 stop6h 03m

$279

DenverMoline

DEN - MLI

DENMLI

Denver Intl

Wed 5/6

10:29 pm-11:29 am

1 stop12h 00m

Moline Quad-City

Sat 5/16

5:47 pm-8:24 am

1 stop15h 37m

$283

DenverChampaign

DEN - CMI

DENCMI

Denver Intl

Fri 5/8

6:10 am-2:31 pm

1 stop7h 21m

Champaign University-Willard

Sun 5/10

6:55 pm-12:06 am

1 stop6h 11m

$328

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 August. Flight prices, which tend to average around $195, 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 August, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $198.

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

The cheapest day to depart from Denver to Illinois is on a Thursday when prices can be found for as low as $296. Flights from Denver to Illinois on a Sunday will generally be more expensive and average around $508. 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 $221. Flights at noon are often more expensive with an average ticket price of $536.

What is the cheapest Denver Intl to Illinois flight route?

Fly from Denver Intl to Greater Peoria 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 $263 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 $204 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

$74

Fastest flight time

2h 00m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from Denver in the past 72 hours is $74. The best round-trip flight deal from Denver to Illinois found on momondo in the last 72 hours is $271.
The fastest flight from Denver to Illinois takes 2h 00m
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
Allegiant AirPriceFrom $54Free CancellationRating
7.3
707 reviews
Search Allegiant Air flights
FrontierPriceFrom $74Free CancellationRating
5.6
2,978 reviews
Search Frontier flights
JetBluePriceFrom $126Free CancellationRating
7.1
2,954 reviews
Search JetBlue flights
SouthwestPriceFrom $157Free CancellationRating
8.0
4,333 reviews
Search Southwest flights
American AirlinesPriceFrom $159Free CancellationRating
7.1
11,667 reviews
Search American Airlines flights
United AirlinesPriceFrom $167Free CancellationRating
7.4
9,650 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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