HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

$40+ Cheap flights from Denver (DEN) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — ORD
jul. 30 — ago. 61
From?
To?
mar. 7/30
mar. 8/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Leverage Cheapflights for Your Next Trip

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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

Users have found that booking a flight from Denver to Illinois at least 56 days early can save you up to 114% on average compared to booking a flight this week. If booking 56 days before your flight isn’t an option for you, users have found flights from Denver to Illinois for as little as $154 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $285 for flights departing within the next 3 days.

What is the cheapest month to fly from Denver to Illinois?

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, April can be a great choice for travel to Illinois. Flights to Illinois from Denver in April are about $174 on average during April, but can be found for as low as $40.

What is the cheapest time of day to fly from DEN to IL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Denver to Illinois as you normally would.

Cheap Denver to Illinois flights in July & August 2024

Find cheap flight options from Denver to Illinois specifically for the months of July and August 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,752,877 searches. Prices were last updated on julio 25, 2024.
These are some of the best deals we've found on flights to Illinois in 2024 at this time. For more flight deals, be sure to check back very soon.
This Cheapflightsfares deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/228:50 amDEN - ORD
Nonstop2h 29mFrontier
sáb. 8/245:24 pmORD - DEN
Nonstop2h 41mFrontier
Deal found 7/24$56
This Cheapflightsfares deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/223:37 pmDEN - STL
Nonstop2h 11mFrontier
mar. 8/277:48 pmSTL - DEN
Nonstop2h 22mFrontier
Deal found 7/23$56
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/248:00 pmDEN - ORD
Nonstop2h 28mFrontier
sáb. 8/315:24 pmORD - DEN
Nonstop2h 41mFrontier
Deal found 7/25$57
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/243:37 pmDEN - STL
Nonstop2h 11mFrontier
mar. 8/277:48 pmSTL - DEN
Nonstop2h 22mFrontier
Deal found 7/25$57
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/178:00 pmDEN - ORD
Nonstop2h 28mFrontier
mar. 8/205:24 pmORD - DEN
Nonstop2h 41mFrontier
Deal found 7/24$58
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/246:00 amDEN - MDW
Nonstop2h 22mFrontier
sáb. 8/3110:38 pmMDW - DEN
Nonstop2h 47mFrontier
Deal found 7/25$58
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/153:37 pmDEN - STL
Nonstop2h 11mFrontier
lun. 8/199:24 pmSTL - DEN
Nonstop2h 24mFrontier
Deal found 7/24$58
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/178:00 pmDEN - ORD
Nonstop2h 28mFrontier
lun. 8/197:42 pmORD - DEN
Nonstop2h 50mFrontier
Deal found 7/24$59
This mytrip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/2610:37 pmDEN - ORD
Nonstop2h 34mFrontier
sáb. 8/315:24 pmORD - DEN
Nonstop2h 41mFrontier
Deal found 7/24$60

Denver to Illinois 2024 flight deals

Discover exclusive flight deals for travel between Denver and Illinois in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated julio 25, 2024.
These are some of the best deals we've found on flights to Illinois in 2024 at this time. For more flight deals, be sure to check back very soon.
This Cheapflightsfares deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/228:50 amDEN - ORD
Nonstop2h 29mFrontier
sáb. 8/245:24 pmORD - DEN
Nonstop2h 41mFrontier
Deal found 7/24$56
This Cheapflightsfares deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/223:37 pmDEN - STL
Nonstop2h 11mFrontier
mar. 8/277:48 pmSTL - DEN
Nonstop2h 22mFrontier
Deal found 7/23$56
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/248:00 pmDEN - ORD
Nonstop2h 28mFrontier
sáb. 8/315:24 pmORD - DEN
Nonstop2h 41mFrontier
Deal found 7/25$57
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/243:37 pmDEN - STL
Nonstop2h 11mFrontier
mar. 8/277:48 pmSTL - DEN
Nonstop2h 22mFrontier
Deal found 7/25$57
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/178:00 pmDEN - ORD
Nonstop2h 28mFrontier
mar. 8/205:24 pmORD - DEN
Nonstop2h 41mFrontier
Deal found 7/24$58
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/246:00 amDEN - MDW
Nonstop2h 22mFrontier
sáb. 8/3110:38 pmMDW - DEN
Nonstop2h 47mFrontier
Deal found 7/25$58
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/153:37 pmDEN - STL
Nonstop2h 11mFrontier
lun. 8/199:24 pmSTL - DEN
Nonstop2h 24mFrontier
Deal found 7/24$58
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/178:00 pmDEN - ORD
Nonstop2h 28mFrontier
lun. 8/197:42 pmORD - DEN
Nonstop2h 50mFrontier
Deal found 7/24$59
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/88:44 amDEN - STL
Nonstop2h 06mFrontier
mar. 10/810:32 pmSTL - DEN
Nonstop2h 29mFrontier
Deal found 7/24$59

Denver to Illinois flights leaving soon

Find last-minute flight options from Denver to Illinois for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated julio 25, 2024.
Book one of these great deals on flights from Denver to Illinois. It's wise to confirm all flight details are correct before booking.
This Cheapflightsfares deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/316:15 amDEN - STL
Nonstop2h 10mFrontier
sáb. 8/37:51 pmSTL - DEN
Nonstop2h 22mFrontier
Deal found 7/24$111
This Cheapflightsfares deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/316:15 amDEN - STL
Nonstop2h 10mFrontier
jue. 8/18:57 pmSTL - DEN
Nonstop2h 23mFrontier
Deal found 7/24$112
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/212:29 pmDEN - BMI
Nonstop2h 12mFrontier
mar. 8/65:33 pmBMI - DEN
Nonstop2h 33mFrontier
Deal found 7/25$133
This Cheapflightsfares deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/316:15 amDEN - STL
Nonstop2h 10mFrontier
jue. 8/19:44 pmSTL - DEN
1 stop7h 16mFrontier
Deal found 7/23$150
This mytrip.com deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/19:00 pmDEN - ORD
Nonstop2h 35mFrontier
mié. 8/75:32 pmORD - DEN
Nonstop2h 41mFrontier
Deal found 7/24$151
This Cheapflightsfares deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/316:15 amDEN - STL
Nonstop2h 10mFrontier
jue. 8/19:44 pmSTL - DEN
1 stop7h 16mFrontier
Deal found 7/24$151
This Cheapflightsfares deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/3011:41 amDEN - STL
Nonstop2h 06mFrontier
jue. 8/18:57 pmSTL - DEN
Nonstop2h 23mFrontier
Deal found 7/23$155
This Cheapflightsfares deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/3011:41 amDEN - STL
Nonstop2h 06mFrontier
lun. 8/57:51 pmSTL - DEN
Nonstop2h 22mFrontier
Deal found 7/24$156
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/3011:41 amDEN - STL
Nonstop2h 06mFrontier
jue. 8/18:57 pmSTL - DEN
Nonstop2h 23mFrontier
Deal found 7/24$158

One-way flights to Illinois from Denver

Search for one-way flight options from Denver to Illinois. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated julio 25, 2024.
Some of the best available deals we've found on one-way flights from Denver to Illinois. Users needing a return flight from Denver to Illinois should utilize the search form above.
This Trip.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/271:46 pmDEN - MDW
Nonstop2h 24mFrontier
Deal found 7/25$40
This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/169:13 pmDEN - ORD
Nonstop2h 37mFrontier
Deal found 7/25$42
This Cheapflightsfares deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/208:00 pmDEN - ORD
Nonstop2h 28mFrontier
Deal found 7/24$43
This Cheapflightsfares deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/233:37 pmDEN - STL
Nonstop2h 11mFrontier
Deal found 7/24$43
This Cheapflightsfares deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/158:50 amDEN - ORD
Nonstop2h 29mFrontier
Deal found 7/24$44
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/164:31 pmDEN - MDW
Nonstop2h 27mFrontier
Deal found 7/25$44
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/253:37 pmDEN - STL
Nonstop2h 11mFrontier
Deal found 7/24$44
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/174:43 pmDEN - ORD
Nonstop2h 38mFrontier
Deal found 7/24$45
This Frontier deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/157:44 amDEN - MDW
Nonstop2h 22mFrontier
Deal found 7/24$45

Find flights from Denver to Illinois within your budget

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, Cheapflights users made 2,752,877 searches. Data last updated julio 25, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$51 - $159

Route

Depart

Return

Price

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

sáb. 8/24

Nonstop2h 28m

Chicago O'Hare Intl

sáb. 8/31

Nonstop2h 41m

$51

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

jue. 8/15

Nonstop2h 11m

Lambert-St Louis

lun. 8/19

1 stop28h 54m

$55

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

jue. 8/22

Nonstop2h 29m

Chicago O'Hare Intl

sáb. 8/24

Nonstop2h 41m

$56

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

jue. 8/22

Nonstop2h 11m

Lambert-St Louis

mar. 8/27

Nonstop2h 22m

$56

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

sáb. 8/24

Nonstop2h 28m

Chicago O'Hare Intl

sáb. 8/31

Nonstop2h 41m

$57

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

sáb. 8/17

1 stop7h 40m

Chicago O'Hare Intl

lun. 8/19

2 stops29h 06m

$78

Denver IntlGreater Peoria

DEN - PIA

DENPIA

Denver Intl

vie. 10/11

Nonstop2h 01m

Greater Peoria

lun. 10/14

Nonstop2h 19m

$105

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

vie. 8/23

Nonstop2h 34m

Chicago O'Hare Intl

vie. 8/30

2 stops22h 03m

$137

Denver IntlChicago O'Hare Intl

DEN - ORD

DENORD

Denver Intl

jue. 10/10

Nonstop2h 34m

Chicago O'Hare Intl

mar. 10/15

Nonstop2h 48m

$159

Flights are sorted by cheapest first

Deals found on 7/25

No data available for this route at this time. Please check back soon.

Best time to book a flight from Denver to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Denver with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated julio 25, 2024.
Get a feel of what it's like to fly with Delta, Frontier and American Airlines from Denver to Illinois by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Food

7.3

Comfort

8.1

Overall

8.2

Entertainment

7.8

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Southwest
8.2
Very good
5,641 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Food

7.3

Comfort

8.1

Overall

8.2

Entertainment

7.8

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Alaska Airlines
8.1
Very good
9,365 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Food

7.3

Comfort

8.1

Overall

8.2

Entertainment

7.8

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Delta
8.0
Very good
9,630 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Food

7.3

Comfort

8.1

Overall

8.2

Entertainment

7.8

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

JetBlue
7.6
Good
3,996 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Food

7.3

Comfort

8.1

Overall

8.2

Entertainment

7.8

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

United Airlines
7.4
Good
10,000 reviews
Southwest
8.2
Very good
5,641 reviews

Boarding

8.3

Food

7.3

Comfort

8.1

Overall

8.2

Entertainment

7.8

Crew

8.7

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Related info for your journey

Find useful and relevant information for your journey from Denver to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Denver to Illinois?

    Most people fly from Denver Intl (DEN) if they book a flight from Denver to Illinois. Denver Intl is conveniently located just 18.5 mi from Denver’s city center.

  • Can I find flights from Denver to Illinois for under $100 on Cheapflights?

    Yes, there are multiple flights from Denver to Illinois for under $100. The cheapest flight booked recently is on Frontier for just $51, but on average you can expect to pay $60.

  • Are there nonstop flights from Denver to Illinois for under $100 on Cheapflights?

    Cheapflights has at least 20 direct flights from Denver to Illinois under $100. A good price for a nonstop flight from Denver to Illinois is less than $60.

  • Are there last-minute flights available from Denver to Illinois for under $200?

    There are currently 20+ open flights from Denver to Illinois within the next 7 days for less than $200.

  • What days are nonstop flights available from Denver to Illinois?

    Nonstop flights can be found on the following days: Sunday, Monday, Tuesday, Thursday, Friday, Saturday.

  • How many flights depart from Denver to Illinois on average per day?

    21 flight departures from Denver to Illinois per day on average.
    Early Morning (Midnight to 6am) - 10% of flight departures
    Morning (6am - Noon) - 19% of flight departures
    Afternoon (Noon - 6pm) - 62% of flight departures
    Evening (6pm - Midnight) - 10% of flight departures

  • How long is the flight from Denver to Illinois?

    There are many flights that can get you from Denver to Illinois in 2h 28m. Fly via Frontier to get the fastest option. Denver and Illinois are separated by a distance of 891 mi. All flights are typically nonstop.

  • What are the cheapest airlines to fly from Denver to Illinois one-way?

    $40 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Allegiant Air and American Airlines, with prices starting from $62 and $70, respectively.

  • What are the most popular routes from Denver to Illinois?

    When deciding which route to take from Denver to Illinois consider Denver Intl - Chicago O'Hare Intl, Denver Intl - Chicago Midway or Denver Intl - Lambert-St Louis as they are the most popular.

  • What are the most reliable airlines from Denver to Illinois?

    No one likes to see their flight delayed. When booking a flight from Denver to Illinois consider choosing Copa Airlines (88%), Turkish Airlines (84%) or Austrian Airlines (82%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Denver to Illinois?

    Looking at all options, your cheapest flight can be booked for $41. While the most popular route (Denver Intl - Chicago O'Hare Intl) can be booked for $71 on average our data indicates $831 when flying from Denver to Illinois.

  • What does DEN to ORD mean?

    DEN stands for Denver Intl Airport, while ORD stands for Chicago O'Hare Intl Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI) are some additional IATA codes for airports related to your trip.

  • Can I find deals for flights from Denver to Illinois that include extra baggage allowance?

    The amount of baggage you can bring on your Denver to Illinois flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Denver to Illinois with specific airlines?

    Yes, Cheapflights allows you to browse and filter Denver to Illinois flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Denver to Illinois that include hotel bookings?

    Yes. In addition to deals on Denver to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to Illinois.

  • Can I find deals for business class flights from Denver to Illinois?

    Yes. Cheapflights offers flight deals from Denver to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Denver to Illinois that allow pets onboard?

    Many airlines flying from Denver to Illinois offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Denver to Illinois?

    Yes, you can often find last-minute deals on Denver to Illinois flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Denver to Illinois flight deals updated?

    The Denver to Illinois flight deals you see on this page were last updated on 7/25.

  • What are the most popular airlines that fly from Denver to Illinois?

    American Airlines, Delta and Frontier are the most popular airlines when flying from Denver to Illinois.

  • What is the cheapest month to book a flight from Denver to Illinois?

    Currently, February is the cheapest month in which you can book a flight from Denver to Illinois (average of $245). Flying from Denver to Illinois in June is currently the most expensive (average of $308). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Denver to Illinois
See prices for flight routes from nearby airports that may be better suited for you.

Denver to Seattle flights
Denver to Las Vegas flights
Denver to LaGuardia flights
Denver to John F Kennedy Intl flights
Denver to Boston flights
Denver to Newark flights
Denver to O'Hare Intl flights
Denver to Orlando flights
Denver to Miami flights
Denver to Los Angeles flights
Denver to San Diego flights
Denver to Ontario flights
Denver to San Francisco flights
Denver to Philadelphia flights
Denver to Minneapolis flights
Denver to Baltimore flights
Denver to Hobby flights
Denver to Dallas/Fort Worth flights
Denver to Atlanta flights
Denver to Sky Harbor Intl flights
Denver to Detroit flights
Denver to Nashville flights
Denver to Santa Ana flights
Denver to Portland flights
Denver to Tampa flights
Denver to George Bush Intcntl flights
Denver to Austin flights
Denver to Honolulu flights
Denver to Dulles Intl flights
Denver to Charlotte flights
Denver to New Orleans flights
Denver to Indianapolis flights
Denver to Cleveland flights
Denver to Raleigh flights
Denver to Milwaukee flights
Denver to Grand Rapids flights
Denver to Midway flights
Denver to Fort Lauderdale flights
Denver to Salt Lake City flights
Denver to Hartford flights
Denver to Cincinnati flights
Denver to Portland flights
Denver to Kansas City flights
Denver to Pittsburgh flights
Denver to Kahului flights
Denver to Lihue flights
Denver to Des Moines flights
Denver to Reagan-National flights
Denver to Kailua-Kona flights
Denver to Burlington flights

Top 6 airlines flying from Denver to Illinois

Discover the top 6 airlines that operate flights from Denver to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated julio 25, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$34Average$136FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$84Average$155FlexibilityNo cancel feeOn-time88%
Spirit AirlinesCheapest$115Average$209FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$138Average$353FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$146Average$390FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$346FlexibilityNo cancel feeOn-timeN/A
Las Vegas to Honolulu flights
Dallas to Charlotte flights
Houston to Nashville flights
Chicago to New Orleans flights
New York to San Francisco flights
Orlando to Seattle flights
Los Angeles to Europe flights
San Francisco to Phoenix flights
San Francisco to Manila flights
New York to Punta Cana flights
Washington, D.C. to Boston flights
Denver to Indiana flights

Search flights from Denver to Illinois by cabin class

Find flights from Denver to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from Denver to Illinois

Find hourly flight availability from Denver to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated julio 25, 2024.
2%of flight departuresEarly morningMidnight to 6 am
41%of flight departuresMorning6 am to noon
43%of flight departuresAfternoonNoon to 6 pm
14%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Abha
Flights to Komatsu
Flights to Skardu
Flights to Laayoune Hassan I
Flights to Aqaba King Hussein Intl
Flights to Nampula
Flights to Bourgas
Flights to Riverton
Flights to Alpena Phelps/Collins
Flights to Palmas
Flights to Newport State
Flights to Antofagasta Cerro Moreno
Flights to Nuku‘alofa Fua'Amotu Intl
Flights to Ndola
Flights to Fort Dodge
Flights to Miri
Flights to Rhinelander Oneida County
Flights to Seattle Lake Union Spb
Flights to Portsmouth Pease Intl
Flights to Tumbes
Flights to Jigiga
Flights to Diyarbakir
Flights to Akureyri
Flights to Brainerd Crow Wing County
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines