How many flights depart from Ontario to Colorado on average per day?

The number of flights available between Ontario and Colorado is 7 per day as of December 2025. The most frequent departure time is 6:00AM, with 39% of daily flights leaving at noon.

What is the cheapest airline that flies from Ontario to Colorado?

Frontier, United Airlines, and Alaska Airlines are the most popular carriers operating from Ontario to Colorado

What airlines fly to Colorado?

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to Colorado from Ontario according to our data. Frontier is the first choice among our users, with 47% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 8 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

How many flights depart from Ontario to Colorado on average per week?

55 flights are operational weekly from Ontario to Colorado as of December 2025. The most popular departure day for this route is Tue, with 20% of flights per week taking off on this day.

When did momondo last update prices for flights from Ontario Airport to Colorado?

Prices for flights from Ontario Airport to Colorado refresh daily.

How many operators does momondo search for flights from Ontario Airport to Colorado?

As of December 2025, there are 5 operators available to choose from for flights from Ontario Airport to Colorado.

How old do you have to be to fly from Ontario Airport to Colorado?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Colorado.

What documentation or ID do you need to fly to Colorado?

The travel and health documents required for your trip to Colorado can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Colorado. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$49 Cheap Flights from Ontario to Colorado in 2025/26

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Cheap round-trip flights

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7:15 am - 10:40 am

ONT

DEN

2h 25mnonstop

10:29 pm - 11:59 pm

DEN

ONT

2h 30mnonstop

$78Frontier

Wed, Jan 14 - Thu, Jan 15

6:00 am - 9:26 am

ONT

DEN

2h 26mnonstop

9:20 pm - 10:59 pm

DEN

ONT

2h 39mnonstop

$79Frontier

Mon, Jan 12 - Sat, Jan 17

6:20 am - 9:40 am

ONT

DEN

2h 20mnonstop

10:49 pm - 12:20 am

DEN

ONT

2h 31mnonstop

$83Frontier

Thu, Jan 22 - Mon, Jan 26

6:10 am - 9:30 am

ONT

DEN

2h 20mnonstop

9:20 pm - 10:59 pm

DEN

ONT

2h 39mnonstop

$84Frontier

Thu, Jan 15 - Sat, Jan 17

6:00 am - 11:18 am

ONT

COS

4h 18m1 stop

7:59 am - 12:16 pm

COS

ONT

5h 17m1 stop

$197Delta

Tue, Feb 10 - Wed, Feb 11

6:00 am - 11:18 am

ONT

COS

4h 18m1 stop

7:59 am - 12:16 pm

COS

ONT

5h 17m1 stop

$205Delta

Mon, Feb 9 - Tue, Feb 10

1:24 pm - 8:17 pm

ONT

MTJ

5h 53m1 stop

1:32 pm - 10:53 pm

MTJ

ONT

10h 21m2 stops

$216United Airlines

Tue, Jan 13 - Thu, Jan 15

6:00 am - 2:34 pm

ONT

COS

7h 34m2 stops

11:33 am - 10:53 pm

COS

ONT

12h 20m2 stops

$223United Airlines

Sat, Jan 24 - Sat, Jan 31

6:15 am - 12:03 pm

ONT

EGE

4h 48m1 stop

7:43 am - 4:24 pm

EGE

ONT

9h 41m1 stop

$229American Airlines

Sat, Feb 28 - Tue, Mar 3

11:59 pm - 9:44 am

ONT

EGE

8h 45m1 stop

7:43 am - 4:26 pm

EGE

ONT

9h 43m2 stops

$234American Airlines

Sat, Feb 28 - Tue, Mar 3

Frontier flights from Ontario to Colorado

Our best Frontier deals on Ontario to Colorado flight tickets

Frontier

Jan 14

ONT7:15 amOntario

2h 25m

DEN10:40 amDenver Intl

Jan 15

DEN10:29 pmDenver Intl

2h 30m

ONT11:59 pmOntario

$78

Find similar

Frontier

Jan 12

ONT6:00 amOntario

2h 26m

DEN9:26 amDenver Intl

Jan 17

DEN9:20 pmDenver Intl

2h 39m

ONT10:59 pmOntario

$79

Find similar

Frontier

Feb 2

ONT6:20 amOntario

2h 20m

DEN9:40 amDenver Intl

Feb 5

DEN10:49 pmDenver Intl

2h 31m

ONT12:20 amOntario

$83

Find similar

United Airlines flights from Ontario to Colorado

Our best United Airlines deals on Ontario to Colorado flight tickets

United Airlines

Jan 13

ONT1:24 pmOntario

5h 53m

1 stop

MTJ8:17 pmMontrose County

Jan 15

MTJ1:32 pmMontrose County

10h 21m

2 stops

ONT10:53 pmOntario

$216

Find similar

United Airlines

Jan 24

ONT6:00 amOntario

7h 34m

2 stops

COS2:34 pmColorado Springs

Jan 31

COS11:33 amColorado Springs

12h 20m

2 stops

ONT10:53 pmOntario

$223

Find similar

United Airlines

Jan 13

ONT1:24 pmOntario

5h 53m

1 stop

MTJ8:17 pmMontrose County

Jan 15

MTJ7:00 amMontrose County

6h 47m

1 stop

ONT12:47 pmOntario

$260

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Wed 1/14

7:15 am-10:40 am

Nonstop2h 25m

Denver Intl

Thu 1/15

10:29 pm-11:59 pm

Nonstop2h 30m

$78

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Mon 1/12

6:00 am-9:26 am

Nonstop2h 26m

Denver Intl

Sat 1/17

9:20 pm-10:59 pm

Nonstop2h 39m

$79

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Thu 1/22

6:20 am-9:40 am

Nonstop2h 20m

Denver Intl

Mon 1/26

10:49 pm-12:20 am

Nonstop2h 31m

$83

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Thu 1/15

6:10 am-9:30 am

Nonstop2h 20m

Denver Intl

Sat 1/17

9:20 pm-10:59 pm

Nonstop2h 39m

$84

OntarioColorado Springs

ONT - COS

ONTCOS

Ontario

Tue 2/10

6:00 am-11:18 am

1 stop4h 18m

Colorado Springs

Wed 2/11

7:59 am-12:16 pm

1 stop5h 17m

$197

OntarioColorado Springs

ONT - COS

ONTCOS

Ontario

Mon 2/9

6:00 am-11:18 am

1 stop4h 18m

Colorado Springs

Tue 2/10

7:59 am-12:16 pm

1 stop5h 17m

$205

OntarioMontrose

ONT - MTJ

ONTMTJ

Ontario

Tue 1/13

1:24 pm-8:17 pm

1 stop5h 53m

Montrose County

Thu 1/15

1:32 pm-10:53 pm

2 stops10h 21m

$216

OntarioColorado Springs

ONT - COS

ONTCOS

Ontario

Sat 1/24

6:00 am-2:34 pm

2 stops7h 34m

Colorado Springs

Sat 1/31

11:33 am-10:53 pm

2 stops12h 20m

$223

OntarioVail

ONT - EGE

ONTEGE

Ontario

Sat 2/28

6:15 am-12:03 pm

1 stop4h 48m

Vail Eagle County

Tue 3/3

7:43 am-4:24 pm

1 stop9h 41m

$229

OntarioVail

ONT - EGE

ONTEGE

Ontario

Sat 2/28

11:59 pm-9:44 am

1 stop8h 45m

Vail Eagle County

Tue 3/3

7:43 am-4:26 pm

2 stops9h 43m

$234

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How to get the cheapest flight ticket from Ontario to Colorado

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Colorado?

The month of January is, on average, the cheapest month to fly to Colorado from Ontario, with most prices found around $100. The month of February is another great option to travel to Colorado, with average flight prices from Ontario averaging around $128.

What is the cheapest day to depart on your flight to Colorado?

The cheapest day to depart from Ontario to Colorado is on a Friday when prices can be found for as low as $253. On the other hand, Sunday is the most expensive day to depart from Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $338.

What is the cheapest time of day to depart on your flight to Colorado?

The cheapest time of day to fly to Colorado is in the evening when flights can be purchased for as low as $199. At noon is when there is more demand to fly to Colorado, so prices are often more expensive at around $442 per ticket.

What is the cheapest Ontario to Colorado flight route?

Fly from Ontario to Denver Intl for the best Ontario - Colorado flight prices

How far in advance should I book a flight to Colorado?

You are more likely to see cheaper flights to Colorado from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Colorado for around $165 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Colorado from Ontario for as low as $125 on momondo.

What cabin class options are available on Ontario to Colorado flights?

There are 4 cabin classes available to choose from on Ontario to Colorado flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to Colorado flights?

No. A direct flight is the cheapest option for a flight between Ontario to Colorado.

Cheap Ontario to Colorado flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Colorado

Best Price Found	$131
Fastest flight time	2h 10m
Direct flights	Every day
Airports in Colorado	87 airports

The best one-way flight to Colorado from Ontario in the past 72 hours is $131. The best round-trip flight deal from Ontario to Colorado found on momondo in the last 72 hours is $219.

The fastest flight from Ontario to Colorado takes 2h 10m

Direct flights go from Ontario to Colorado every day.

There are 87 airports in Colorado. From Ontario there are direct flights to Denver Intl (DEN).

Search flight deals

When did momondo last update prices for flights from Ontario Airport to Colorado?
Prices for flights from Ontario Airport to Colorado refresh daily.
How many operators does momondo search for flights from Ontario Airport to Colorado?
As of December 2025, there are 5 operators available to choose from for flights from Ontario Airport to Colorado.
How old do you have to be to fly from Ontario Airport to Colorado?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Colorado.
What documentation or ID do you need to fly to Colorado?
The travel and health documents required for your trip to Colorado can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Colorado. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Ontario to Colorado?
Based on momondo bookings for flights between Ontario and Colorado, the leading plane model is Boeing 737 MAX 8, making up 13.49% of the total bookings. Other popular models include Boeing 737-800 with 11.55%, Airbus A321neo with 9.97%, and Boeing 737-800 Passenger/BBJ2 (winglets) with 9.63%.

Best airlines flying from Ontario to Colorado

Compare and see reviews for airlines that fly from Ontario to Colorado with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $58	Free Cancellation	Rating 5.8 3,071 reviews	Search Frontier flights
Delta	PriceFrom $109	Free Cancellation	Rating 7.9 8,018 reviews	Search Delta flights
Southwest	PriceFrom $117	Free Cancellation	Rating 8.0 4,258 reviews	Search Southwest flights
United Airlines	PriceFrom $138	Free Cancellation	Rating 7.4 9,116 reviews	Search United Airlines flights
American Airlines	PriceFrom $268	Free Cancellation	Rating 7.2 11,068 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Colorado?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to Colorado for you.

Can I find flights from Ontario to Colorado with flexible booking policies on momondo?

All flight searches from Ontario to Colorado on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Colorado?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Colorado.

I’m not ready to book a flight from Ontario to Colorado right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to Colorado flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to Colorado

Popular cities in Colorado

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Flights to Seattlefrom $57

Cheap flights from Ontario to Colorado from $50

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Colorado departing on 1/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Find the cheapest flights from Ontario to Colorado

Cheap round-trip flights

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Frontier flights from Ontario to Colorado

Our best Frontier deals on Ontario to Colorado flight tickets

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Our best United Airlines deals on Ontario to Colorado flight tickets

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Use the filters below to find and compare flights from Ontario to Colorado that are best for you.

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How to get the cheapest flight ticket from Ontario to Colorado

What is the cheapest month to fly to Colorado?

The month of January is, on average, the cheapest month to fly to Colorado from Ontario, with most prices found around $100. The month of February is another great option to travel to Colorado, with average flight prices from Ontario averaging around $128.

What is the cheapest day to depart on your flight to Colorado?

What is the cheapest time of day to depart on your flight to Colorado?

The cheapest time of day to fly to Colorado is in the evening when flights can be purchased for as low as $199. At noon is when there is more demand to fly to Colorado, so prices are often more expensive at around $442 per ticket.

What is the cheapest Ontario to Colorado flight route?

Fly from Ontario to Denver Intl for the best Ontario - Colorado flight prices

How far in advance should I book a flight to Colorado?

What cabin class options are available on Ontario to Colorado flights?

There are 4 cabin classes available to choose from on Ontario to Colorado flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ontario to Colorado flights?

No. A direct flight is the cheapest option for a flight between Ontario to Colorado.

What is the cheapest airline that flies from Ontario to Colorado?

Frontier, United Airlines, and Alaska Airlines are the most popular carriers operating from Ontario to Colorado

What airlines fly to Colorado?

How many flights depart from Ontario to Colorado on average per day?

The number of flights available between Ontario and Colorado is 7 per day as of December 2025. The most frequent departure time is 6:00AM, with 39% of daily flights leaving at noon.

How many flights depart from Ontario to Colorado on average per week?

55 flights are operational weekly from Ontario to Colorado as of December 2025. The most popular departure day for this route is Tue, with 20% of flights per week taking off on this day.

Cheap Ontario to Colorado flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Colorado

Best Price Found

Fastest flight time

Direct flights

Airports in Colorado

When did momondo last update prices for flights from Ontario Airport to Colorado?

How many operators does momondo search for flights from Ontario Airport to Colorado?

How old do you have to be to fly from Ontario Airport to Colorado?

What documentation or ID do you need to fly to Colorado?

What is the most popular plane model from Ontario to Colorado?

Best airlines flying from Ontario to Colorado

Compare and see reviews for airlines that fly from Ontario to Colorado with momondo

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Colorado?

Can I find flights from Ontario to Colorado with flexible booking policies on momondo?

How can momondo help me find flights from Ontario to Colorado?

I’m not ready to book a flight from Ontario to Colorado right now. Can momondo alert me if prices change?

An easier way to manage your Colorado trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Colorado

Popular cities in Colorado

Popular flights according to clicks in the last 7 days on momondo