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$75+ Cheap flights from Chicago (CHI) 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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — DEN
May 26 — Jun 21
Mon 5/26
Mon 6/2
1 adult, Economy
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Find cheap flights from Chicago to Denver with Cheapflights

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

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Cheapflights Tip: The best prices from Chicago to Denver Intl are usually found in September or November, booked 30 days in advance, depart on a Wednesday or Tuesday and return on a Friday

Cheap flight deals from Chicago to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) 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 May 21, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$128
(Frontier)

One-way from

$75
(Frontier)

Popular in

December

Cheapest in

September

Average price

$195

Good round-trip deal

$179 or less

Good one-way deal

$95 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 Chicago (CHI) to Denver Intl
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One-way flight from Chicago (CHI) to Denver Intl
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Highest demand for flights based on searches. 2% potential increase in price ($3 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
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Price to beat on a round-trip flight from Chicago (CHI) to Denver Intl.
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Price to beat on a one-way flight from Chicago (CHI) to Denver Intl.
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Find flight deals from Chicago to Denver

Cheapest flights from Chicago to Denver
Explore the most affordable flight options available from Chicago to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 21, 2025.

This Frontier deal was found by Cheapflights users on 5/20. 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.
Wed 5/286:00 amORD - DEN
Nonstop3h 02mFrontier
Fri 5/308:22 pmDEN - ORD
Nonstop2h 30mFrontier
Deal found 5/20$128
This Frontier deal was found by Cheapflights users on 5/20. 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 5/292:44 pmMDW - DEN
Nonstop2h 49mFrontier
Sat 5/315:26 pmDEN - MDW
Nonstop2h 27mFrontier
Deal found 5/20$128
This American Airlines deal was found by Cheapflights users on 5/20. 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.
Wed 9/38:25 pmORD - DEN
Nonstop3h 02mAmerican Airlines
Sun 9/79:03 amDEN - ORD
Nonstop2h 34mAmerican Airlines
Deal found 5/20$154
This Southwest deal was found by Cheapflights users on 5/20. 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 9/36:05 pmMDW - DEN
Nonstop2h 45mSouthwest
Wed 9/1010:25 amDEN - MDW
Nonstop2h 20mSouthwest
Deal found 5/20$157
This Southwest deal was found by Cheapflights users on 5/20. 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.
Thu 9/117:00 amORD - DEN
Nonstop2h 40mSouthwest
Wed 9/177:30 pmDEN - ORD
Nonstop2h 35mSouthwest
Deal found 5/20$173
This United Airlines deal was found by Cheapflights users on 5/20. 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 6/47:10 amORD - DEN
Nonstop2h 48mUnited Airlines
Wed 6/118:50 pmDEN - ORD
Nonstop2h 35mUnited Airlines
Deal found 5/20$204
This Delta deal was found by Cheapflights users on 5/21. 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.
Tue 7/111:00 amORD - DEN
1 stop5h 34mDelta
Wed 7/99:15 amDEN - ORD
1 stop6h 34mDelta
Deal found 5/21$217
This Delta deal was found by Cheapflights users on 5/20. 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.
Tue 7/86:20 pmMDW - DEN
1 stop5h 46mDelta
Sat 7/129:15 amDEN - MDW
1 stop6h 55mDelta
Deal found 5/20$217
This Sun Country Air deal was found by Cheapflights users on 5/21. 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.
Wed 6/2511:50 amORD - DEN
1 stop9h 17mSun Country Air
Sun 6/296:15 amDEN - ORD
1 stop12h 02mSun Country Air
Deal found 5/21$255

Cheapflights Fare Finder

Customize your flight search to find flights from Chicago 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 May 21, 2025.
Use the filters below to find and compare flights from Chicago to Denver that are best for you.

Fly from

Chicago

Fly to

Denver

Route

Depart

Return

Price

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Wed 5/28

6:00 am-8:02 am

Nonstop3h 02m

Denver Intl

Fri 5/30

8:22 pm-11:52 pm

Nonstop2h 30m

$128

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Thu 5/29

2:44 pm-4:33 pm

Nonstop2h 49m

Denver Intl

Sat 5/31

5:26 pm-8:53 pm

Nonstop2h 27m

$128

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Sat 6/28

5:10 am-6:45 am

Nonstop2h 35m

Denver Intl

Wed 7/2

4:45 pm-8:10 pm

Nonstop2h 25m

$160

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Wed 6/11

6:49 am-8:23 am

Nonstop2h 34m

Denver Intl

Wed 6/18

2:11 pm-5:44 pm

Nonstop2h 33m

$169

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Tue 8/12

6:15 am-2:20 pm

1 stop9h 05m

Denver Intl

Sat 8/16

9:35 am-1:05 pm

Nonstop2h 30m

$173

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Wed 6/4

7:10 am-8:58 am

Nonstop2h 48m

Denver Intl

Wed 6/11

8:50 pm-12:25 am

Nonstop2h 35m

$204

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Tue 7/1

11:00 am-3:34 pm

1 stop5h 34m

Denver Intl

Tue 7/8

9:15 am-3:03 pm

1 stop4h 48m

$217

ChicagoDenver

MDW - DEN

MDWDEN

Chicago Midway

Tue 7/8

9:24 am-12:47 pm

1 stop4h 23m

Denver Intl

Wed 7/16

6:05 am-12:29 pm

1 stop5h 24m

$217

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Thu 7/3

6:15 pm-4:41 pm

1 stop23h 26m

Denver Intl

Thu 7/10

7:00 pm-5:21 pm

1 stop21h 21m

$225

ChicagoDenver

ORD - DEN

ORDDEN

Chicago O'Hare Intl

Tue 7/1

7:00 am-8:49 am

Nonstop2h 49m

$75

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/20

Showing 1-10 of 22 results
1
2
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Compare providers for flights from Chicago to Denver

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Chicago to Denver in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Chicago-Denver flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Chicago-Denver flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Chicago-Denver flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago-Denver flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago-Denver flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Chicago to Denver flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Chicago to Denver trip
Airlines
Frontier

Frontier's UpFront Plus guarantees an empty middle seat, enhancing comfort for a fee.


Frontier's Economy Bundle includes a carry-on, seat selection, and no change fees.

Read more about Frontierby Marisa Garcia
United Airlines

United's Economy Plus offers extra legroom seats, ideal for added comfort on domestic flights.


United's MileagePlus allows pooling miles, a great way to gather enough for a ticket.

Read more about United Airlinesby Harriet Baskas
Airports
ORD

Use the free shuttle train at ORD to navigate between terminals efficiently, especially if you have a tight connection.

Read more about ORDby Ramsey Qubein
MDW

Order food via MDW's mobile system to your gate to avoid missing Southwest's open seating boarding process.

Read more about MDWby Ramsey Qubein
DEN

Take the A Line train from DEN to Union Station for a cost-effective and efficient trip to downtown Denver.

Read more about DENby Emily Zemler
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on ORD and MDW

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Emily Zemler

Emily Zemler

Expert on DEN

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more

Best time to book a flight from Chicago to Denver

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

How far ahead should I book a flight from Chicago to Denver?

Use this chart to determine the optimal time to book a round-trip flight from Chicago to Denver. Price data was last updated on May 16, 2025.

The price you pay for your flight from Chicago to Denver may vary depending on when you book. For the best chance of a lower fare, look to book 30 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, October is the cheapest month in which you can book a flight from Chicago to Denver (average of $197). Flying from Chicago 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 CHI to DEN?

Find hourly flight availability from Chicago 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 May 21, 2025.

A simple way to save on the total cost of your ticket is to fly from Chicago to Denver in the afternoon. If you’re flexible enough to do this you can expect to save up to 31% on your trip compared to booking a flight at noon.

What is the cheapest day to fly from Chicago to Denver?

Use this chart to determine the cheapest time to fly round-trip from Chicago to Denver. Price data was last updated on May 18, 2025.

Travelers seeking maximum savings on their Chicago to Denver flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Chicago to Denver

Explore weekly flight availability from Chicago 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 May 21, 2025.

The most flights from CHI to DEN are scheduled on a Wednesday (64 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 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 May 21, 2025.
To help decide which airline to fly from Chicago to Denver, see what other customers have to say about Alaska Airlines, Southwest and Delta. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.2

Food

7.1

Overall

8.0

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.2

Food

7.1

Overall

8.0

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,289 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.2

Food

7.1

Overall

8.0

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,951 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.2

Food

7.1

Overall

8.0

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,745 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.2

Food

7.1

Overall

8.0

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Allegiant Air
7.3
Good
732 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.2

Food

7.1

Overall

8.0

Comfort

7.9

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Chicago 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 Chicago?

    Denver Intl (DEN), located 18.5 mi from the city center, is the airport you fly into when you book flights from Chicago to Denver. 4 airlines have flights to Denver Intl from Chicago on a regular basis. Booking flights from Chicago to Denver Intl should not be difficult; the airport handles an average of 38 inbound flights from Chicago per day.

  • What are the cheapest airlines flying from Chicago to Denver round-trip?

    Frontier, at $128, was found to be the cheapest airline from Chicago to Denver.Alternate airlines to your destination round-trip include Southwest and American Airlines. Users have found that Frontier is 31% cheaper than the other options available to this destination.

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

    One-way options have recently been found by users for as low as $75 on Frontier. Other airlines that offer cheap prices include United Airlines from $76 and Southwest from $76 one-way.

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

    The top 3 most reliable airlines when flying from Chicago to Denver are Royal Jordanian (84%), Copa Airlines (83%) and Air Canada (80%).

  • What are the cheapest flights from Chicago to Denver?

    Looking at all options, your cheapest flight can be booked for $75. While the most popular route (Chicago O'Hare Intl - Denver Intl) can be booked for $125 on average our data indicates $616 when flying from Chicago to Denver.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Chicago 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 Chicago to Denver?

    Currently, October is the cheapest month in which you can book a flight from Chicago to Denver (average of $197). Flying from Chicago 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 Chicago?

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

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Alternative routes for Chicago to Denver

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Chicago to Denver

Discover the top 4 airlines that operate flights from Chicago 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 May 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$47Average$136FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$147Average$241FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$154Average$290FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$159Average$263FlexibilityNo cancel feeOn-time63%

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