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$43+ Cheap flights from Illinois to Denver (DEN)

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 2/14. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — DEN
dic. 23 — dic. 301
lun. 12/23
lun. 12/30
1 adult, Economy
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Cheap flight deals from Illinois to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Illinois (USIL) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated diciembre 18, 2024.

Round-trip from

$76
(Cheapflightsfares)

One-way from

$43
(Cheapflightsfares)
From Illinois to Denver Intl
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One-way flight from Illinois to Denver Intl
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Find flight deals from Illinois to Denver

Cheapest flights from Illinois to Denver
Explore the most affordable flight options available from Illinois to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on diciembre 18, 2024.

This Cheapflightsfares deal was found by Cheapflights users on 12/16. 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. 12/306:49 pmSTL - DEN
Nonstop2h 36mFrontier
lun. 1/65:05 amDEN - STL
Nonstop2h 08mFrontier
Deal found 12/16$116
This FlightHub deal was found by Cheapflights users on 12/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/2310:04 pmMDW - DEN
Nonstop2h 53mFrontier
mié. 12/256:10 pmDEN - MDW
Nonstop2h 22mFrontier
Deal found 12/17$143
This Kiwi.com deal was found by Cheapflights users on 12/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/246:55 amORD - DEN
Nonstop2h 57mFrontier
mié. 12/258:10 pmDEN - ORD
Nonstop2h 36mFrontier
Deal found 12/17$199
This Gotogate deal was found by Cheapflights users on 12/17. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/2410:00 amORD - DEN
1 stop8h 17mMultiple Airlines
lun. 3/39:08 pmDEN - ORD
Nonstop2h 36mMultiple Airlines
Deal found 12/17$212
This Southwest deal was found by Cheapflights users on 12/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/248:35 pmMDW - DEN
Nonstop2h 45mSouthwest
mié. 12/2512:50 pmDEN - MDW
Nonstop2h 15mSouthwest
Deal found 12/16$220
This Southwest deal was found by Cheapflights users on 12/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/247:10 pmORD - DEN
Nonstop3h 05mSouthwest
mié. 12/251:15 pmDEN - ORD
Nonstop2h 30mSouthwest
Deal found 12/16$224
This Delta deal was found by Cheapflights users on 12/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/243:18 pmORD - DEN
1 stop5h 40mDelta
mié. 12/2510:32 amDEN - ORD
1 stop5h 08mDelta
Deal found 12/16$287
This Sun Country Air deal was found by Cheapflights users on 12/17. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/2410:00 amORD - DEN
1 stop8h 17mSun Country Air
mar. 12/3110:04 amDEN - ORD
1 stop6h 34mSun Country Air
Deal found 12/17$300
This American Airlines deal was found by Cheapflights users on 12/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/245:30 amPIA - DEN
1 stop6h 06mAmerican Airlines
vie. 12/276:28 amDEN - PIA
1 stop6h 46mAmerican Airlines
Deal found 12/18$323
This American Airlines deal was found by Cheapflights users on 12/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/305:37 pmMLI - DEN
1 stop6h 30mAmerican Airlines
jue. 1/26:00 amDEN - MLI
1 stop8h 00mAmerican Airlines
Deal found 12/17$323
This Delta deal was found by Cheapflights users on 12/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/2411:48 amMDW - DEN
1 stop5h 58mDelta
lun. 12/3012:20 amDEN - MDW
1 stop7h 30mDelta
Deal found 12/17$347
This American Airlines deal was found by Cheapflights users on 12/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/309:19 pmORD - DEN
Nonstop2h 48mAmerican Airlines
mar. 1/76:01 amDEN - ORD
1 stop8h 25mAmerican Airlines
Deal found 12/18$395

Find flights from Illinois to Denver within your budget

Customize your flight search to find flights from Illinois to Denver 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 2,558,603 searches. Data last updated diciembre 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

lun. 1/13

7:50 am-9:51 am

Nonstop3h 01m

Denver Intl

jue. 1/16

10:26 am-2:02 pm

Nonstop2h 36m

$76

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

mar. 2/18

7:05 am-8:59 am

Nonstop2h 54m

Denver Intl

lun. 2/24

8:55 pm-12:17 am

Nonstop2h 22m

$76

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

vie. 1/24

7:09 pm-8:37 pm

Nonstop2h 28m

Denver Intl

lun. 1/27

6:00 am-9:16 am

Nonstop2h 16m

$77

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

vie. 1/24

11:15 am-12:43 pm

Nonstop2h 28m

Denver Intl

lun. 1/27

1:33 pm-4:38 pm

Nonstop2h 05m

$84

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

sáb. 2/8

8:05 pm-9:58 pm

Nonstop2h 53m

Denver Intl

mar. 2/11

3:55 pm-7:31 pm

Nonstop2h 36m

$139

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

mar. 1/21

8:42 am-10:34 am

Nonstop2h 52m

Denver Intl

mar. 1/28

1:00 pm-4:35 pm

Nonstop2h 35m

$140

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

mié. 2/5

11:35 am-1:20 pm

Nonstop2h 45m

Denver Intl

sáb. 2/8

6:10 pm-9:30 pm

Nonstop2h 20m

$160

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mar. 1/14

1:40 pm-3:05 pm

Nonstop2h 25m

Denver Intl

mar. 1/21

7:20 pm-10:20 pm

Nonstop2h 00m

$178

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

mié. 2/5

12:15 pm-2:00 pm

Nonstop2h 45m

Denver Intl

dom. 2/9

7:05 am-10:45 am

Nonstop2h 40m

$193

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

sáb. 2/1

11:41 am-5:47 pm

1 stop7h 06m

Denver Intl

mar. 2/4

9:26 am-4:23 pm

1 stop5h 57m

$207

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Showing 1-10 of 59 results
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Best time to book a flight from Illinois to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Illinois 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.

Travel insights for flights from Illinois to Denver

Get recent, data-driven insights about flights from Illinois to Denver including ideal travel times, pricing trends, and more.

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

Currently, October is the cheapest month in which you can book a flight from Illinois to Denver (average of $197). Flying from Illinois to Denver in March is currently the most expensive (average of $271). 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.

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

Find hourly flight availability from Illinois to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated diciembre 18, 2024.

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

Rainfall in Denver by month

Plan your trip to Denver by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Denver ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Denver when rainfall is around 0.5 in.

Temperature in Denver by month

Plan your trip to Denver by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Denver, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated diciembre 18, 2024.
Get a feel of what it's like to fly with Frontier, American Airlines and United Airlines from Illinois to Denver 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
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,554 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Allegiant Air
7.4
Good
829 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Denver. 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 into for flights to Denver from Illinois?

    For a flight from Illinois to Denver, you will be flying into Denver Intl. Denver Intl (DEN) is just 18.5 mi from the center of the city.

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

    The cheapest airlines for a one-way flight from Illinois to Denver are Frontier ($43), United Airlines ($70), and Southwest ($70).

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

    While some choose either Chicago Midway - Denver Intl or Lambert-St Louis - Denver Intl, Chicago O'Hare Intl - Denver Intl is the most popular route from Illinois to Denver.

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

    The top 3 most reliable airlines when flying from Illinois to Denver are Cathay Pacific (100%), Southwest (90%) and Turkish Airlines (86%).

  • What are the cheapest flights from Illinois to Denver?

    While on average a flight from Illinois to Denver is generally $663, our data shows the cheapest flight currently is $70. When looking at the most popular route, (Chicago O'Hare Intl - Denver Intl), you can expect to pay $90 for that flight.

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

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Illinois to Denver (average of $197). Flying from Illinois to Denver in March is currently the most expensive (average of $271). 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.

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Alternative routes for Illinois to Denver

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Illinois to Denver

Discover the top 6 airlines that operate flights from Illinois to Denver. 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 2,558,603 searches. Data last updated diciembre 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$39Average$155FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$92Average$177FlexibilityNo cancel feeOn-time88%
American AirlinesCheapest$139Average$378FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$152Average$359FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$157Average$249FlexibilityNo cancel feeOn-time63%
DeltaCheapest$185Average$456FlexibilityNo cancel feeOn-timeN/A
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