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Ontario

$42+ Cheap flights from Colorado to Ontario (ONT)

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 12/18. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — ONT
Nov 26 — Dec 31
Tue 11/26
Tue 12/3
1 adult, Economy
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Cheap flight deals from Colorado to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Colorado (USCO) to Ontario (ONT). 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 November 21, 2024.

Find flight deals from Colorado to Ontario

Cheapest flights from Colorado to Ontario
Explore the most affordable flight options available from Colorado to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 21, 2024.

This Frontier deal was found by Cheapflights users on 11/20. 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.
Tue 12/1710:29 pmDEN - ONT
Nonstop2h 30mFrontier
Tue 1/147:45 amONT - DEN
Nonstop2h 18mFrontier
Deal found 11/20$73
This Expedia deal was found by Cheapflights users on 11/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3110:29 pmDEN - ONT
Nonstop2h 30mMultiple Airlines
Tue 1/1411:14 amONT - DEN
2 stops10h 22mMultiple Airlines
Deal found 11/20$190
This American Airlines deal was found by Cheapflights users on 11/20. 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.
Tue 12/3111:32 amDEN - ONT
1 stop7h 53mAmerican Airlines
Tue 1/144:25 pmONT - DEN
1 stop4h 35mAmerican Airlines
Deal found 11/20$207
This United Airlines deal was found by Cheapflights users on 11/19. 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.
Sun 12/1511:16 amDEN - ONT
Nonstop2h 24mUnited Airlines
Wed 12/185:05 amONT - DEN
Nonstop2h 20mUnited Airlines
Deal found 11/19$217
This Delta deal was found by Cheapflights users on 11/20. 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.
Wed 12/186:29 pmDEN - ONT
1 stop6h 45mDelta
Thu 12/195:30 amONT - DEN
1 stop5h 12mDelta
Deal found 11/20$226
This United Airlines deal was found by Cheapflights users on 11/20. 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.
Thu 12/53:25 pmGJT - ONT
1 stop6h 22mUnited Airlines
Mon 12/95:05 amONT - GJT
1 stop6h 23mUnited Airlines
Deal found 11/20$349
This American Airlines deal was found by Cheapflights users on 11/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/225:00 amGJT - ONT
1 stop5h 12mAmerican Airlines
Sat 12/286:10 amONT - GJT
1 stop4h 10mAmerican Airlines
Deal found 11/21$358
This United Airlines deal was found by Cheapflights users on 11/20. 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.
Mon 12/237:00 amCOS - ONT
1 stop6h 40mUnited Airlines
Mon 12/305:05 amONT - COS
1 stop4h 44mUnited Airlines
Deal found 11/20$419
This United Airlines deal was found by Cheapflights users on 11/20. 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.
Mon 12/233:29 pmMTJ - ONT
1 stop6h 20mUnited Airlines
Fri 12/275:05 amONT - MTJ
1 stop14h 18mUnited Airlines
Deal found 11/20$557
This United Airlines deal was found by Cheapflights users on 11/20. 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.
Tue 12/107:25 amEGE - ONT
1 stop6h 15mUnited Airlines
Thu 12/125:05 amONT - EGE
1 stop4h 34mUnited Airlines
Deal found 11/20$622
This Delta deal was found by Cheapflights users on 11/20. 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.
Sun 12/18:20 amCOS - ONT
1 stop4h 51mDelta
Tue 12/101:25 pmONT - COS
1 stop5h 14mDelta
Deal found 11/20$644
This Southwest deal was found by Cheapflights users on 11/20. 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.
Fri 11/296:45 amCOS - ONT
1 stop5h 50mSouthwest
Sun 12/15:40 amONT - COS
1 stop5h 50mSouthwest
Deal found 11/20$656

Find flights from Colorado to Ontario within your budget

Customize your flight search to find flights from Colorado to Ontario 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 2,629,791 searches. Data last updated November 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

DenverOntario

DEN - ONT

DENONT

Denver Intl

Tue 12/17

10:29 pm-11:59 pm

Nonstop2h 30m

Ontario

Tue 1/14

7:45 am-11:03 am

Nonstop2h 18m

$73

DenverOntario

DEN - ONT

DENONT

Denver Intl

Sat 1/18

6:00 am-9:51 am

1 stop4h 51m

Ontario

Tue 1/21

10:47 am-6:20 pm

1 stop6h 33m

$172

DenverOntario

DEN - ONT

DENONT

Denver Intl

Tue 12/31

10:29 pm-11:59 pm

Nonstop2h 30m

Ontario

Tue 1/14

11:14 am-10:36 pm

2 stops10h 22m

$190

DenverOntario

DEN - ONT

DENONT

Denver Intl

Tue 12/31

11:32 am-6:25 pm

1 stop7h 53m

Ontario

Tue 1/14

4:25 pm-10:00 pm

1 stop4h 35m

$207

DenverOntario

DEN - ONT

DENONT

Denver Intl

Wed 12/18

6:29 pm-12:14 am

1 stop6h 45m

Ontario

Thu 12/19

5:30 am-11:42 am

1 stop5h 12m

$226

DenverOntario

DEN - ONT

DENONT

Denver Intl

Sat 3/8

7:00 am-8:17 pm

1 stop14h 17m

Ontario

Sat 3/15

1:10 pm-11:49 pm

1 stop9h 39m

$242

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Fri 1/10

5:15 pm-8:51 pm

1 stop4h 36m

Ontario

Sun 1/12

5:10 am-10:53 am

1 stop4h 43m

$329

Grand JunctionOntario

GJT - ONT

GJTONT

Grand Junction Regnl

Thu 12/5

3:25 pm-8:47 pm

1 stop6h 22m

Ontario

Mon 12/9

5:05 am-12:28 pm

1 stop6h 23m

$349

Grand JunctionOntario

GJT - ONT

GJTONT

Grand Junction Regnl

Sun 12/22

5:00 am-9:12 am

1 stop5h 12m

Ontario

Sat 12/28

6:10 am-11:20 am

1 stop4h 10m

$358

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Fri 1/10

4:43 pm-11:58 am

2 stops20h 15m

Ontario

Sun 1/12

12:51 pm-11:51 pm

2 stops10h 00m

$442

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/21

Showing 1-10 of 34 results
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Best time to book a flight from Colorado to Ontario

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

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

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

Currently, September is the cheapest month in which you can book a flight from Colorado to Ontario (average of $236). Flying from Colorado to Ontario in December is currently the most expensive (average of $298). 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 CO to ONT?

Find hourly flight availability from Colorado to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 21, 2024.

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

Weekly flight availability from Colorado to Ontario

Explore weekly flight availability from Colorado to Ontario. 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 November 21, 2024.

The most flights from USCO to ONT are scheduled on a Wednesday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated November 21, 2024.
Get a feel of what it's like to fly with Frontier, United Airlines and American Airlines from Colorado to Ontario by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
5,015 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,458 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,758 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
9,172 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Related info for your journey

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

    If you book a flight to Ontario from Colorado, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • How popular is this Colorado to Ontario flight route?

    The Colorado to Ontario flight path was viewed by 98 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 Colorado to Ontario one-way?

    The cheapest airlines for a one-way flight from Colorado to Ontario are Frontier ($42), United Airlines ($79), and American Airlines ($99).

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

    While some choose either Colorado Springs - Ontario or Grand Junction Regnl - Ontario, Denver Intl - Ontario is the most popular route from Colorado to Ontario.

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

    No one likes to see their flight delayed. When booking a flight from Colorado to Ontario consider choosing Air Canada (90%), United Airlines (88%) or Frontier (75%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Colorado to Ontario?

    While on average a flight from Colorado to Ontario is generally $172, our data shows the cheapest flight currently is $26. When looking at the most popular route, (Denver Intl - Ontario), you can expect to pay $57 for that flight.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from Colorado to Ontario (average of $236). Flying from Colorado to Ontario in December is currently the most expensive (average of $298). 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 Colorado to Ontario

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

Discover the top 5 airlines that operate flights from Colorado to Ontario. 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 2,629,791 searches. Data last updated November 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$47Average$132FlexibilityNo cancel feeOn-time62%
DeltaCheapest$89Average$306FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$139Average$410FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$178Average$326FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$276Average$431FlexibilityNo cancel feeOn-time71%
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