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$54+ 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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — DEN
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
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Cheap flight deals from Illinois to Denver

Keep the following information in mind while searching for Illinois to Denver flight deals. Data was last updated March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$92
(Cheapflightsfares)

One-way from

$54
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$218

Good round-trip deal

$141 or less

Good one-way deal

$99 or less
Provider with most accurate pricing for Chicago (CHI)-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Denver Intl flights.
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From Illinois to Denver Intl
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One-way flight from Illinois to Denver Intl
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Highest demand for flights based on searches. 6% potential increase in price ($11 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Illinois to Denver Intl.
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Price to beat on a 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 March 28, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 3/26. 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.
Mon 5/2610:09 amPIA - DEN
Nonstop2h 25mAllegiant Air
Fri 5/3012:24 pmDEN - PIA
Nonstop2h 00mAllegiant Air
Deal found 3/26$92
This eDestinos deal was found by Cheapflights users on 3/27. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/18:03 pmMDW - DEN
Nonstop2h 53mFrontier
Mon 5/53:42 pmDEN - MDW
Nonstop2h 26mFrontier
Deal found 3/27$105
This Frontier deal was found by Cheapflights users on 3/27. 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.
Thu 4/176:45 amORD - DEN
Nonstop2h 57mFrontier
Mon 4/219:08 pmDEN - ORD
Nonstop2h 29mFrontier
Deal found 3/27$110
This Cheapflightsfares deal was found by Cheapflights users on 3/27. 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.
Sat 5/108:15 pmSTL - DEN
Nonstop2h 33mFrontier
Wed 5/146:50 amDEN - STL
Nonstop2h 09mFrontier
Deal found 3/27$116
This United Airlines deal was found by Cheapflights users on 3/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/217:10 amORD - DEN
Nonstop2h 56mUnited Airlines
Sat 5/316:00 amDEN - ORD
Nonstop2h 41mUnited Airlines
Deal found 3/27$159
This Southwest deal was found by Cheapflights users on 3/27. 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.
Wed 5/215:50 amMDW - DEN
Nonstop2h 35mSouthwest
Tue 5/277:25 pmDEN - MDW
Nonstop2h 25mSouthwest
Deal found 3/27$159
This American Airlines deal was found by Cheapflights users on 3/27. 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.
Mon 5/59:45 pmORD - DEN
Nonstop2h 48mAmerican Airlines
Thu 5/83:49 pmDEN - ORD
Nonstop2h 34mAmerican Airlines
Deal found 3/27$169
This Mytrip deal was found by Cheapflights users on 3/27. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1411:54 amORD - DEN
1 stop6h 15mMultiple Airlines
Wed 4/169:08 pmDEN - ORD
Nonstop2h 29mMultiple Airlines
Deal found 3/27$172
This Southwest deal was found by Cheapflights users on 3/27. 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.
Wed 4/231:30 pmORD - DEN
1 stop8h 05mSouthwest
Sat 4/267:30 pmDEN - ORD
Nonstop2h 35mSouthwest
Deal found 3/27$174
This Delta deal was found by Cheapflights users on 3/27. 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.
Sat 4/266:00 amSTL - DEN
1 stop5h 09mDelta
Fri 5/212:55 amDEN - STL
1 stop7h 52mDelta
Deal found 3/27$197
This American Airlines deal was found by Cheapflights users on 3/27. 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.
Tue 4/297:19 amSTL - DEN
1 stop7h 09mAmerican Airlines
Sat 5/312:13 pmDEN - STL
1 stop6h 16mAmerican Airlines
Deal found 3/27$199
This Southwest deal was found by Cheapflights users on 3/27. 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.
Tue 4/295:20 amSTL - DEN
1 stop4h 30mSouthwest
Wed 4/308:35 amDEN - STL
Nonstop2h 00mSouthwest
Deal found 3/27$203

Cheapflights Fare Finder

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 March 28, 2025.
Use the filters below to find and compare flights from Illinois to Denver that are best for you.

Fly from

Illinois

Fly to

Denver

Route

Depart

Return

Price

PeoriaDenver

PIA - DEN

PIADEN

Greater Peoria

Mon 5/26

10:09 am-11:34 am

Nonstop2h 25m

Denver Intl

Fri 5/30

12:24 pm-3:24 pm

Nonstop2h 00m

$92

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Thu 5/1

8:03 pm-9:56 pm

Nonstop2h 53m

Denver Intl

Mon 5/5

3:42 pm-7:08 pm

Nonstop2h 26m

$105

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Thu 4/17

6:45 am-8:42 am

Nonstop2h 57m

Denver Intl

Mon 4/21

9:08 pm-12:37 am

Nonstop2h 29m

$110

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 5/10

8:15 pm-9:48 pm

Nonstop2h 33m

Denver Intl

Wed 5/14

6:50 am-9:59 am

Nonstop2h 09m

$116

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Wed 5/21

7:10 am-9:06 am

Nonstop2h 56m

Denver Intl

Sat 5/31

6:00 am-9:41 am

Nonstop2h 41m

$159

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Wed 5/21

5:50 am-7:25 am

Nonstop2h 35m

Denver Intl

Tue 5/27

7:25 pm-10:50 pm

Nonstop2h 25m

$159

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Mon 5/5

9:45 pm-11:33 pm

Nonstop2h 48m

Denver Intl

Thu 5/8

3:49 pm-7:23 pm

Nonstop2h 34m

$169

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Mon 4/14

11:54 am-5:09 pm

1 stop6h 15m

Denver Intl

Wed 4/16

9:08 pm-12:37 am

Nonstop2h 29m

$172

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Wed 4/23

1:30 pm-8:35 pm

1 stop8h 05m

Denver Intl

Sat 4/26

7:30 pm-11:05 pm

Nonstop2h 35m

$174

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 4/26

6:00 am-10:09 am

1 stop5h 09m

Denver Intl

Fri 5/2

12:55 am-9:47 am

1 stop7h 52m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 60 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.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Denver

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 $278). 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 March 28, 2025.

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.

Weekly flight availability from Illinois to Denver

Explore weekly flight availability from Illinois to Denver. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 28, 2025.

The most flights from USIL to DEN are scheduled on a Friday (46 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (7 on average).

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 March 28, 2025.
Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta 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
4,273 reviews

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.
Alaska Airlines
8.0
Very good
9,798 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.
Delta
8.0
Very good
7,896 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.
United Airlines
7.4
Good
8,603 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.
Allegiant Air
7.3
Good
731 reviews
Southwest
8.1
Very good
4,273 reviews

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Entertainment

7.6

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Steven,Feb 2025

BZN - DEN

Bozeman Airport knows how to deal with snow. I saw many airlines leave with only small delays due to the foot of snow. Our plane was 4 hours delayed. I missed my connection in Denver with a 3.5 hour layover. Because of that, the best you Southwest could do was make me wait more hours, them send me to Chicago Midway, where I had to wait overnight, for 7 more hours until a flight to RSW was available. Nobody at Southwest told me that Midway shuts down after 8pm. Everything was closed. I had no idea. You just dumped me there. I am a 65 year old man and you dumped me in Midway without even a couch to lie on. I was awake 21 hours because of this. No, it was not an act of God. Other airlines were moving passengers out. It was incompetence Shame on you.

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 ($54), Allegiant Air ($64), and Southwest ($80).

  • 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 Frontier (90%), Copa Airlines (90%) and United Airlines (87%).

  • What are the cheapest flights from Illinois to Denver?

    While on average a flight from Illinois to Denver is generally $619, our data shows the cheapest flight currently is $58. When looking at the most popular route, (Chicago O'Hare Intl - Denver Intl), you can expect to pay $138 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 $278). 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

Traveling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
Westminster
Lakewood
Black Hawk
Winter Park
Broomfield
Cripple Creek
Silverthorne
Golden
Brighton
Greeley
Frisco
Wheat Ridge
Grand Lake
Idaho Springs
Central City
Copper Mountain
Longmont
Thornton
Limon
Dillon

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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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$43Average$152FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$91Average$162FlexibilityNo cancel feeOn-time88%
American AirlinesCheapest$146Average$374FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$150Average$330FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$158Average$267FlexibilityNo cancel feeOn-time63%
DeltaCheapest$217Average$248FlexibilityNo cancel feeOn-timeN/A
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