HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$53+ 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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — ONT
dic. 23 — dic. 301
lun. 12/23
lun. 12/30
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Colorado to Ontario 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 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 diciembre 18, 2024.

Round-trip from

$76
(FlightHub)

One-way from

$53
(Cheapflightsfares)
From Colorado to Ontario
Search Deals
One-way flight from Colorado to Ontario
Search Deals

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 diciembre 18, 2024.

This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/3110:00 amDEN - ONT
Nonstop2h 32mFrontier
mar. 1/147:45 amONT - DEN
Nonstop2h 18mFrontier
Deal found 12/17$78
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.
sáb. 12/283:15 pmEGE - ONT
1 stop6h 34mUnited Airlines
mar. 12/315:05 amONT - EGE
1 stop4h 45mUnited 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.
sáb. 12/287:00 amGJT - ONT
1 stop6h 40mUnited Airlines
vie. 1/35:05 amONT - GJT
1 stop4h 54mUnited Airlines
Deal found 12/17$454
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/267:50 pmCOS - ONT
1 stop4h 45mSouthwest
lun. 1/63:55 pmONT - COS
1 stop4h 45mSouthwest
Deal found 12/16$476
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.
lun. 12/308:15 amCOS - ONT
1 stop5h 25mUnited Airlines
jue. 1/26:30 pmONT - COS
1 stop4h 22mUnited Airlines
Deal found 12/16$496
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.
vie. 12/2710:38 amASE - ONT
1 stop7h 48mUnited Airlines
sáb. 12/286:00 amONT - ASE
1 stop5h 22mUnited Airlines
Deal found 12/17$528
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.
mié. 12/187:00 amMTJ - ONT
1 stop6h 40mUnited Airlines
mar. 12/245:05 amONT - MTJ
1 stop6h 21mUnited Airlines
Deal found 12/17$544
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/193:29 pmEGE - ONT
1 stop9h 30mFrontier
vie. 12/207:57 pmONT - EGE
1 stop12h 32mFrontier
Deal found 12/17$658
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.
jue. 12/191:16 pmGJT - ONT
1 stop4h 02mDelta
vie. 12/204:58 pmONT - GJT
1 stop4h 32mDelta
Deal found 12/17$782
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/1912:16 pmASE - ONT
1 stop4h 09mAmerican Airlines
vie. 12/206:05 amONT - ASE
1 stop8h 37mAmerican Airlines
Deal found 12/17$866
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/1810:48 amCOS - ONT
2 stops8h 39mAmerican Airlines
sáb. 12/2112:59 amONT - COS
1 stop8h 13mAmerican Airlines
Deal found 12/17$881
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/196:00 amGJT - ONT
2 stops10h 25mAmerican Airlines
vie. 12/204:25 pmONT - GJT
1 stop5h 03mAmerican Airlines
Deal found 12/17$882

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 2,558,603 searches. Data last updated diciembre 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

DenverOntario

DEN - ONT

DENONT

Denver Intl

mié. 2/19

10:34 pm-12:06 am

Nonstop2h 32m

Ontario

sáb. 2/22

12:59 am-4:16 am

Nonstop2h 17m

$76

VailOntario

EGE - ONT

EGEONT

Vail Eagle County

dom. 2/9

3:28 pm-9:40 am

1 stop19h 12m

Ontario

sáb. 2/15

12:59 am-2:07 pm

1 stop12h 08m

$78

DenverOntario

DEN - ONT

DENONT

Denver Intl

mar. 1/14

11:33 am-6:04 pm

1 stop7h 31m

Ontario

mar. 1/21

10:47 am-6:20 pm

1 stop6h 33m

$196

DenverOntario

DEN - ONT

DENONT

Denver Intl

mar. 1/14

11:24 am-3:29 pm

1 stop5h 05m

Ontario

mar. 1/21

10:00 am-3:19 pm

1 stop4h 19m

$207

DenverOntario

DEN - ONT

DENONT

Denver Intl

mar. 1/7

10:14 pm-11:44 pm

Nonstop2h 30m

Ontario

mar. 1/14

11:14 am-10:36 pm

2 stops10h 22m

$210

DenverOntario

DEN - ONT

DENONT

Denver Intl

jue. 1/16

6:05 pm-11:53 pm

1 stop6h 48m

Ontario

mar. 1/21

5:10 pm-10:47 pm

1 stop4h 37m

$216

Grand JunctionOntario

GJT - ONT

GJTONT

Grand Junction Regnl

mar. 2/4

3:19 pm-6:24 pm

1 stop4h 05m

Ontario

sáb. 2/8

4:25 pm-10:18 pm

1 stop4h 53m

$293

Grand JunctionOntario

GJT - ONT

GJTONT

Grand Junction Regnl

sáb. 2/15

7:00 am-12:42 pm

1 stop6h 42m

Ontario

jue. 2/20

5:05 am-12:38 pm

1 stop6h 33m

$298

AspenOntario

ASE - ONT

ASEONT

Aspen Pitkin County

jue. 1/9

4:31 pm-10:16 pm

1 stop6h 45m

Ontario

dom. 1/12

6:10 am-11:57 am

1 stop4h 47m

$329

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

mar. 1/14

8:20 am-12:26 pm

1 stop5h 06m

Ontario

vie. 1/17

1:21 pm-7:11 pm

1 stop4h 50m

$345

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 36 results
1
2
3
4

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 diciembre 18, 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.

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 diciembre 18, 2024.
Get a feel of what it's like to fly with American Airlines, Frontier and Southwest 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
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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

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

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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

Alaska Airlines
8.0
Very good
9,552 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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

United Airlines
7.4
Good
9,059 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

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
4,848 reviews

Comfort

8.1

Overall

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Food

7.2

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 94 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 ($53), American Airlines ($99), and United Airlines ($108).

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

    While some choose either Colorado Springs - Ontario or Aspen Pitkin County - 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 (93%), United Airlines (90%) or Southwest (77%) 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 $152, our data shows the cheapest flight currently is $42. When looking at the most popular route, (Denver Intl - Ontario), you can expect to pay $58 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.

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 Colorado to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Los Angeles flights
Newark to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Dallas/Fort Worth to Las Vegas flights
Newark to Las Vegas flights
Seattle to Las Vegas flights
John F Kennedy Intl to San Francisco flights
Seattle to Los Angeles flights
San Francisco to Las Vegas flights
O'Hare Intl to Las Vegas flights
LaGuardia to Los Angeles flights
O'Hare Intl to Los Angeles flights
Dallas/Fort Worth to Los Angeles flights
Minneapolis to Las Vegas flights
Los Angeles to Las Vegas flights
San Francisco to Los Angeles flights
Atlanta to Las Vegas flights
Dulles Intl to Las Vegas flights
Hobby to Las Vegas flights
Denver to Las Vegas flights
LaGuardia to Las Vegas flights
Boston to Los Angeles flights
Santa Ana to Las Vegas flights
Reagan-National to Los Angeles flights
Los Angeles to San Francisco flights
Newark to San Francisco flights
Baltimore to Las Vegas flights
Hobby to Los Angeles flights
Burbank to Las Vegas flights
San Jose to Las Vegas flights
Baltimore to Los Angeles flights
George Bush Intcntl to Las Vegas flights
Detroit to Las Vegas flights
Boston to Las Vegas flights
Dulles Intl to Los Angeles flights
Oakland to Las Vegas flights
Philadelphia to Las Vegas flights
Portland to Los Angeles flights
George Bush Intcntl to Los Angeles flights
Dallas/Fort Worth to San Francisco flights
Seattle to San Diego flights
Love Field to Las Vegas flights
Dallas/Fort Worth to Ontario flights
Austin to Las Vegas flights
Atlanta to Los Angeles flights
Reagan-National to Las Vegas flights
Midway to Las Vegas flights
Newark to Burbank flights
Seattle to San Francisco flights
John F Kennedy Intl to San Diego flights

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 2,558,603 searches. Data last updated diciembre 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$47Average$129FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$139Average$365FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$178Average$351FlexibilityNo cancel feeOn-time63%
DeltaCheapest$195Average$368FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$297Average$435FlexibilityNo cancel feeOn-time71%
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.