HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Colorado

$46+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DEN
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Colorado 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
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 December 18, 2024.

Round-trip from

$73
(Cheapflightsfares)

One-way from

$49
(Cheapflightsfares)
From Ontario to Colorado
Search Deals
One-way flight from Ontario to Colorado
Search Deals

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 December 18, 2024.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/3012:59 amONT - DEN
Nonstop2h 23mFrontier
Tue 12/3110:29 pmDEN - ONT
Nonstop2h 30mFrontier
Deal found 12/18$105
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2512:59 amONT - EGE
1 stop12h 40mFrontier
Sun 12/293:29 pmEGE - ONT
1 stop9h 30mFrontier
Deal found 12/17$211
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/255:05 amONT - ASE
1 stop4h 50mUnited Airlines
Tue 12/319:01 amASE - ONT
1 stop4h 39mUnited Airlines
Deal found 12/17$403
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/311:42 pmONT - EGE
1 stop5h 19mUnited Airlines
Wed 1/85:21 pmEGE - ONT
1 stop4h 30mUnited Airlines
Deal found 12/17$408
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/312:50 pmONT - COS
1 stop3h 40mSouthwest
Sun 1/55:35 amCOS - ONT
1 stop6h 30mSouthwest
Deal found 12/17$426
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/315:05 amONT - DRO
1 stop5h 10mUnited Airlines
Mon 1/2011:34 amDRO - ONT
1 stop10h 17mUnited Airlines
Deal found 12/17$532
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/195:05 amONT - MTJ
1 stop6h 21mUnited Airlines
Wed 12/253:29 pmMTJ - ONT
1 stop6h 20mUnited Airlines
Deal found 12/16$544
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/266:30 pmONT - COS
1 stop4h 22mUnited Airlines
Mon 12/303:30 pmCOS - ONT
1 stop6h 19mUnited Airlines
Deal found 12/17$556
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/271:42 pmONT - GJT
1 stop6h 11mUnited Airlines
Mon 12/301:25 pmGJT - ONT
1 stop5h 01mUnited Airlines
Deal found 12/18$603
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/286:10 amONT - EGE
1 stop5h 21mAmerican Airlines
Wed 1/18:24 amEGE - ONT
1 stop6h 34mAmerican Airlines
Deal found 12/16$631
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3110:40 amONT - EGE
2 stops30h 00mAlaska Airlines
Wed 1/86:51 pmEGE - ONT
2 stops24h 08mAlaska Airlines
Deal found 12/17$637
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.
Tue 12/241:05 pmONT - COS
1 stop5h 34mDelta
Wed 1/18:00 amCOS - ONT
1 stop5h 08mDelta
Deal found 12/17$642

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioVail

ONT - EGE

ONTEGE

Ontario

Thu 1/30

6:45 am-2:38 pm

1 stop6h 53m

Vail Eagle County

Sun 2/2

3:28 pm-9:40 am

1 stop19h 12m

$78

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Thu 1/9

8:11 pm-11:32 pm

Nonstop2h 21m

Denver Intl

Mon 1/13

4:05 pm-5:35 pm

Nonstop2h 30m

$78

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Sun 1/19

5:10 am-8:29 am

Nonstop2h 19m

Denver Intl

Sun 1/19

7:25 pm-8:51 pm

Nonstop2h 26m

$197

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 1/7

1:21 pm-7:21 pm

1 stop5h 00m

Denver Intl

Mon 1/13

8:25 am-12:26 pm

1 stop5h 01m

$236

OntarioGrand Junction

ONT - GJT

ONTGJT

Ontario

Sun 1/5

6:10 am-11:20 am

1 stop4h 10m

Grand Junction Regnl

Sat 1/11

5:00 am-9:09 am

1 stop5h 09m

$238

OntarioGrand Junction

ONT - GJT

ONTGJT

Ontario

Sun 1/5

4:58 pm-10:30 pm

1 stop4h 32m

Grand Junction Regnl

Sat 1/11

6:00 am-3:25 pm

2 stops10h 25m

$243

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Sun 1/19

5:45 am-9:00 am

Nonstop2h 15m

Denver Intl

Sun 1/19

5:50 pm-9:45 pm

1 stop4h 55m

$247

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Thu 2/6

6:39 pm-1:07 pm

1 stop17h 28m

Denver Intl

Sat 2/8

12:04 pm-10:34 am

2 stops23h 30m

$264

OntarioAspen

ONT - ASE

ONTASE

Ontario

Thu 1/9

6:10 am-11:57 am

1 stop4h 47m

Aspen Pitkin County

Mon 1/13

4:51 pm-10:45 pm

1 stop6h 54m

$288

OntarioMontrose

ONT - MTJ

ONTMTJ

Ontario

Wed 1/15

1:45 pm-8:22 pm

1 stop5h 37m

Montrose County

Sat 1/18

3:29 pm-8:51 pm

1 stop6h 22m

$296

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Showing 1-10 of 41 results
1
2
3
...
5

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 $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 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 December 18, 2024.

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 December 18, 2024.

The most flights from ONT to USCO are scheduled on a Tuesday (9 on average). You will have fewer flight options on Thursday, 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 December 18, 2024.
Get a feel of what it's like to fly with United Airlines, Delta and Southwest 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
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

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

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

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
9,554 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

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

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

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
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

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
4,848 reviews

Crew

8.7

Overall

8.1

Comfort

8.1

Food

7.2

Boarding

8.2

Entertainment

7.7

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 ($49), United Airlines ($79), and Delta ($118).

  • 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 - Aspen Pitkin County or Ontario - Vail Eagle 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: Southwest (96%), Air Canada (94%), United Airlines (94%).

  • What are the cheapest flights from Ontario to Colorado?

    Looking at all options, your cheapest flight can be booked for $49. While the most popular route (Ontario - Denver Intl) can be booked for $60 on average our data indicates $680 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 $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.

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 Ontario to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
Los Angeles to Newark flights
Los Angeles to Honolulu flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Seattle flights
San Francisco to Las Vegas flights
Los Angeles to LaGuardia flights
Los Angeles to Dallas/Fort Worth flights
Los Angeles to Miami flights
Los Angeles to Las Vegas flights
San Francisco to Los Angeles flights
Los Angeles to Orlando flights
Los Angeles to O'Hare Intl flights
Santa Ana to Las Vegas flights
San Francisco to Newark flights
Los Angeles to San Francisco flights
Los Angeles to Hobby flights
San Francisco to Honolulu flights
San Francisco to Seattle flights
Burbank to Las Vegas flights
San Jose to Las Vegas flights
Los Angeles to Fort Lauderdale flights
San Francisco to Dallas/Fort Worth flights
Oakland to Las Vegas flights
Los Angeles to Reagan-National flights
Ontario to Dallas/Fort Worth flights
Los Angeles to Boston flights
San Francisco to Miami flights
Santa Ana to Newark flights
Los Angeles to George Bush Intcntl flights
Ontario to Seattle flights
Los Angeles to Baltimore flights
Los Angeles to Atlanta flights
San Francisco to LaGuardia flights
Los Angeles to New Orleans flights
Burbank to Newark flights
San Jose to Los Angeles flights
Los Angeles to San Jose flights
Los Angeles to Portland flights
Santa Ana to Seattle flights
Los Angeles to Salt Lake City flights
Los Angeles to Dulles Intl flights
Oakland to Los Angeles flights
San Diego to John F Kennedy Intl flights
Burbank to LaGuardia flights
Oakland to Santa Ana flights
Los Angeles to Sky Harbor Intl flights
San Francisco to Sky Harbor Intl flights
Los Angeles to Denver flights
Santa Ana to LaGuardia flights

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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$53Average$111FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$148Average$452FlexibilityNo cancel feeOn-time69%
DeltaCheapest$159Average$302FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$177Average$387FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$178Average$316FlexibilityNo cancel feeOn-time63%
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.