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$39+ Cheap flights from Ontario (ONT) to Colorado

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 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DEN
janv. 21 — janv. 281
mar. 1/21
mar. 1/28
1 adult, Economy
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Cheap flight deals from Ontario to Colorado

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Colorado (USCO). 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 janvier 16, 2025.

Round-trip from

$58
(Frontier)

One-way from

$43
(Flightnetwork)
From Ontario to Colorado
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One-way flight from Ontario to Colorado
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Find flight deals from Ontario to Colorado

Cheapest flights from Ontario to Colorado
Explore the most affordable flight options available from Ontario to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on janvier 16, 2025.

This CheapOair deal was found by Cheapflights users on 1/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 1/236:45 amONT - EGE
1 stop6h 53mFrontier
dim. 1/263:28 pmEGE - ONT
1 stop19h 12mFrontier
Deal found 1/16$78
This Cheapflightsfares deal was found by Cheapflights users on 1/16. 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.
ven. 2/710:40 amONT - DEN
Nonstop2h 21mFrontier
dim. 2/98:54 amDEN - ONT
Nonstop2h 33mFrontier
Deal found 1/16$78
This Southwest deal was found by Cheapflights users on 1/16. 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.
mer. 2/125:45 amONT - DEN
Nonstop2h 15mSouthwest
mar. 2/188:25 amDEN - ONT
Nonstop2h 30mSouthwest
Deal found 1/16$177
This Travelocity deal was found by Cheapflights users on 1/15. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 3/147:00 amONT - DEN
1 stop5h 54mMultiple Airlines
dim. 3/1610:37 pmDEN - ONT
Nonstop2h 32mMultiple Airlines
Deal found 1/15$207
This American Airlines deal was found by Cheapflights users on 1/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/116:10 amONT - DEN
1 stop4h 59mAmerican Airlines
mar. 2/182:26 pmDEN - ONT
1 stop5h 00mAmerican Airlines
Deal found 1/16$208
This Delta deal was found by Cheapflights users on 1/16. 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.
mer. 2/121:21 pmONT - DEN
1 stop4h 59mDelta
lun. 2/246:05 pmDEN - ONT
1 stop6h 46mDelta
Deal found 1/16$217
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 2/151:44 pmONT - DEN
Nonstop2h 19mUnited Airlines
sam. 3/110:15 amDEN - ONT
1 stop5h 15mUnited Airlines
Deal found 1/16$227
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 2/151:44 pmONT - DRO
1 stop7h 31mUnited Airlines
sam. 2/227:00 amDRO - ONT
1 stop6h 42mUnited Airlines
Deal found 1/16$278
This Delta deal was found by Cheapflights users on 1/16. 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.
sam. 2/151:21 pmONT - COS
1 stop4h 29mDelta
sam. 2/228:20 amCOS - ONT
1 stop5h 04mDelta
Deal found 1/16$287
This United Airlines deal was found by Cheapflights users on 1/14. 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.
jeu. 2/65:10 amONT - GJT
1 stop6h 23mUnited Airlines
dim. 2/97:00 amGJT - ONT
1 stop6h 41mUnited Airlines
Deal found 1/14$289
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 2/151:44 pmONT - COS
1 stop7h 16mUnited Airlines
sam. 2/227:30 amCOS - ONT
2 stops8h 00mUnited Airlines
Deal found 1/16$301
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 3/185:05 amONT - EGE
1 stop4h 42mUnited Airlines
mar. 3/251:43 pmEGE - ONT
2 stops7h 27mUnited Airlines
Deal found 1/16$312

Find flights from Ontario to Colorado within your budget

Customize your flight search to find flights from Ontario to Colorado 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 janvier 16, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioDenver

ONT - DEN

ONTDEN

Ontario

lun. 2/24

12:59 am-4:16 am

Nonstop2h 17m

Denver Intl

sam. 3/1

10:37 pm-12:09 am

Nonstop2h 32m

$62

OntarioVail

ONT - EGE

ONTEGE

Ontario

jeu. 1/30

6:45 am-2:38 pm

1 stop6h 53m

Vail Eagle County

jeu. 2/20

3:07 pm-12:09 am

1 stop10h 02m

$69

OntarioDenver

ONT - DEN

ONTDEN

Ontario

mer. 2/12

5:45 am-9:00 am

Nonstop2h 15m

Denver Intl

mar. 2/18

8:25 am-9:55 am

Nonstop2h 30m

$177

OntarioDenver

ONT - DEN

ONTDEN

Ontario

ven. 3/14

7:00 am-1:54 pm

1 stop5h 54m

Denver Intl

dim. 3/16

10:37 pm-12:09 am

Nonstop2h 32m

$207

OntarioDenver

ONT - DEN

ONTDEN

Ontario

mar. 2/11

4:25 pm-10:00 pm

1 stop4h 35m

Denver Intl

mar. 2/18

2:26 pm-6:26 pm

1 stop5h 00m

$208

OntarioDenver

ONT - DEN

ONTDEN

Ontario

mar. 2/4

6:00 am-11:37 am

1 stop4h 37m

Denver Intl

mar. 2/4

6:05 pm-11:51 pm

1 stop6h 46m

$217

OntarioDenver

ONT - DEN

ONTDEN

Ontario

mer. 2/12

1:45 pm-5:04 pm

Nonstop2h 19m

Denver Intl

dim. 2/16

11:15 am-12:42 pm

Nonstop2h 27m

$257

OntarioDurango

ONT - DRO

ONTDRO

Ontario

sam. 2/15

1:44 pm-10:15 pm

1 stop7h 31m

Durango La Plata County

sam. 2/22

7:00 am-12:42 pm

1 stop6h 42m

$278

OntarioColorado Springs

ONT - COS

ONTCOS

Ontario

sam. 2/15

1:21 pm-6:50 pm

1 stop4h 29m

Colorado Springs

sam. 2/22

8:20 am-12:24 pm

1 stop5h 04m

$287

OntarioGrand Junction

ONT - GJT

ONTGJT

Ontario

jeu. 2/6

5:10 am-12:33 pm

1 stop6h 23m

Grand Junction Regnl

dim. 2/9

7:00 am-12:41 pm

1 stop6h 41m

$289

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/15

Showing 1-10 of 42 results
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Best time to book a flight from Ontario to Colorado

Have a flexible travel schedule? Discover the best time to fly to Colorado from Ontario 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 Ontario to Colorado

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

What is the cheapest month to book a flight from Ontario to Colorado?

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

Find hourly flight availability from Ontario to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated janvier 16, 2025.

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

Weekly flight availability from Ontario to Colorado

Explore weekly flight availability from Ontario to Colorado. 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 janvier 16, 2025.

The most flights from ONT to USCO are scheduled on a Thursday (10 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in Colorado by month

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

In terms of precipitation, rainfall in Colorado 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 Colorado when rainfall is around 0.5 in.

Temperature in Colorado by month

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

If weather is an important factor for your trip to Colorado, 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 Colorado

Get insights into the airlines that provide service to Colorado. 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 Colorado. Reviews last updated janvier 16, 2025.
Get a feel of what it's like to fly with Southwest, Delta and Frontier from Ontario to Colorado by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Food

7.2

Overall

8.1

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Food

7.2

Overall

8.1

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.0
Very good
9,681 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Food

7.2

Overall

8.1

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
8,511 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Food

7.2

Overall

8.1

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
8,964 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Food

7.2

Overall

8.1

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Food

7.2

Overall

8.1

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Related info for your journey

Find useful and relevant information for your journey from Ontario to Colorado. 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 Ontario to Colorado?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Colorado.

  • How popular is this Ontario to Colorado flight route?

    The Ontario to Colorado flight path was viewed by 325 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines to fly from Ontario to Colorado one-way?

    The cheapest airlines for a one-way flight from Ontario to Colorado are Frontier ($43), Southwest ($79), and United Airlines ($89).

  • What are the most popular routes from Ontario to Colorado?

    The most popular route from Ontario to Colorado is Ontario - Denver Intl. You may also consider Ontario - Vail Eagle County or Ontario - Aspen Pitkin County.

  • What are the most reliable airlines from Ontario to Colorado?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Ontario to Colorado on time: Air Canada (93%), United Airlines (89%), Southwest (87%).

  • What are the cheapest flights from Ontario to Colorado?

    Looking at all options, your cheapest flight can be booked for $46. While the most popular route (Ontario - Denver Intl) can be booked for $63 on average our data indicates $751 when flying from Ontario to Colorado.

  • Can I find deals for flights from Ontario to Colorado that include hotel bookings?

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

  • How can I find direct flights from Ontario to Colorado?

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

  • Can I find deals for business class flights from Ontario to Colorado?

    Yes. Cheapflights offers flight deals from Ontario to Colorado 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 Ontario to Colorado?

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

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Alternative routes for Ontario to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to Colorado

Discover the top 5 airlines that operate flights from Ontario to Colorado. 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 janvier 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$52Average$131FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$148Average$450FlexibilityNo cancel feeOn-time69%
DeltaCheapest$159Average$299FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$177Average$372FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$178Average$321FlexibilityNo cancel feeOn-time63%
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