How long does it take to fly to Ontario?

Average flight duration from Colorado to Ontario depends on which airport you fly into and out of. Flying from Aspen to Los Angeles is 2h 23m on average, while flying from Denver to Los Angeles is 2h 31m on average. Los Angeles is the most popular airport in Ontario.

What airlines fly to Ontario?

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to Ontario from Colorado according to our data. Frontier is the first choice among our users, with 52% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 8 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

As of February 2026, there are 36 flights per week flying from Colorado to Ontario. The most common day of the week flights depart is Mon, with 22% of flights taking off on this day.

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

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

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

5 flights are operational daily from Colorado to Ontario as of February 2026. The most popular departure time for this route is 11:00AM, with 51% of flights per day taking off in the evening.

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

Prices for flights from Colorado to Ontario Airport refresh daily.

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

As of February 2026, there are 5 operators available to choose from for flights from Colorado to Ontario Airport.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Colorado to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$22 Cheap Flights from Colorado to Ontario in 2026

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Cheap round-trip flights

Enter your travel dates to find the best prices.

8:00 am - 9:34 am

DEN

ONT

2h 34mnonstop

6:15 am - 9:35 am

ONT

DEN

2h 20mnonstop

$91Frontier

Thu, Mar 5 - Sun, Mar 8

10:29 pm - 11:59 pm

DEN

ONT

2h 30mnonstop

6:15 am - 9:35 am

ONT

DEN

2h 20mnonstop

$92Frontier

Wed, Mar 11 - Fri, Mar 13

10:29 pm - 11:55 pm

DEN

ONT

2h 26mnonstop

12:59 am - 4:15 am

ONT

DEN

2h 16mnonstop

$94Frontier

Wed, Apr 15 - Fri, Apr 17

7:40 am - 12:07 pm

GJT

ONT

5h 27m

1 stop

5:09 pm - 9:53 pm

ONT

GJT

3h 44m

1 stop

$211Delta

Sat, Mar 7 - Wed, Mar 11

7:59 am - 12:14 pm

COS

ONT

5h 15m

1 stop

6:00 am - 11:12 am

ONT

COS

4h 12m

1 stop

$213Delta

Sat, Apr 18 - Sat, Apr 25

12:27 pm - 4:22 pm

EGE

ONT

4h 55m

1 stop

9:53 am - 3:47 pm

ONT

EGE

4h 54m

1 stop

$269American Airlines

Thu, Mar 5 - Mon, Mar 9

7:15 am - 12:38 pm

MTJ

ONT

6h 23m

1 stop

1:40 pm - 8:18 pm

ONT

MTJ

5h 38m

1 stop

$281United Airlines

Wed, Apr 29 - Thu, May 7

7:05 am - 12:48 pm

GJT

ONT

6h 43m

1 stop

1:50 pm - 8:37 pm

ONT

GJT

5h 47m

1 stop

$281United Airlines

Sat, Mar 7 - Tue, Mar 10

8:55 pm - 12:10 am

COS

ONT

4h 15m

1 stop

4:25 pm - 9:20 pm

ONT

COS

3h 55m

1 stop

$318Southwest

Fri, Mar 13 - Tue, Mar 17

12:27 pm - 4:22 pm

EGE

ONT

4h 55m

1 stop

11:58 pm - 9:55 am

ONT

EGE

8h 57m

1 stop

$339American Airlines

Fri, Mar 6 - Tue, Mar 10

Frontier flights from Colorado to Ontario

Our best Frontier deals on Colorado to Ontario flight tickets

Frontier

Mar 5

DEN8:00 amDenver Intl

2h 34m

ONT9:34 amOntario

Mar 8

ONT6:15 amOntario

2h 20m

DEN9:35 amDenver Intl

$91

Frontier

Mar 11

DEN10:29 pmDenver Intl

2h 30m

ONT11:59 pmOntario

Mar 13

ONT6:15 amOntario

2h 20m

DEN9:35 amDenver Intl

$92

Frontier

Apr 15

DEN10:29 pmDenver Intl

2h 26m

ONT11:55 pmOntario

Apr 17

ONT12:59 amOntario

2h 16m

DEN4:15 amDenver Intl

$94

American Airlines flights from Colorado to Ontario

Our best American Airlines deals on Colorado to Ontario flight tickets

American Airlines

Feb 12

GJT7:18 amGrand Junction Regnl

5h 10m

1 stop

ONT11:28 amOntario

Feb 15

ONT6:15 amOntario

4h 17m

1 stop

GJT11:32 amGrand Junction Regnl

$259

American Airlines

Mar 5

EGE12:27 pmVail Eagle County

4h 55m

1 stop

ONT4:22 pmOntario

Mar 9

ONT9:53 amOntario

4h 54m

1 stop

EGE3:47 pmVail Eagle County

$269

American Airlines

Feb 13

GJT4:46 pmGrand Junction Regnl

6h 43m

1 stop

ONT10:29 pmOntario

Feb 15

ONT6:15 amOntario

4h 17m

1 stop

GJT11:32 amGrand Junction Regnl

$299

Fly from

Fly to

Route

Depart

Return

Price

DenverOntario

DEN - ONT

DENONT

Denver Intl

Thu 3/5

8:00 am-9:34 am

Nonstop2h 34m

Ontario

Sun 3/8

6:15 am-9:35 am

Nonstop2h 20m

$91

DenverOntario

DEN - ONT

DENONT

Denver Intl

Wed 3/11

10:29 pm-11:59 pm

Nonstop2h 30m

Ontario

Fri 3/13

6:15 am-9:35 am

Nonstop2h 20m

$92

DenverOntario

DEN - ONT

DENONT

Denver Intl

Wed 4/15

10:29 pm-11:55 pm

Nonstop2h 26m

Ontario

Fri 4/17

12:59 am-4:15 am

Nonstop2h 16m

$94

Grand JunctionOntario

GJT - ONT

GJTONT

Grand Junction Regnl

Sat 3/7

7:40 am-12:07 pm

1 stop5h 27m

Ontario

Wed 3/11

5:09 pm-9:53 pm

1 stop3h 44m

$211

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Sat 4/18

7:59 am-12:14 pm

1 stop5h 15m

Ontario

Sat 4/25

6:00 am-11:12 am

1 stop4h 12m

$213

VailOntario

EGE - ONT

EGEONT

Vail Eagle County

Thu 3/5

12:27 pm-4:22 pm

1 stop4h 55m

Ontario

Mon 3/9

9:53 am-3:47 pm

1 stop4h 54m

$269

MontroseOntario

MTJ - ONT

MTJONT

Montrose County

Wed 4/29

7:15 am-12:38 pm

1 stop6h 23m

Ontario

Thu 5/7

1:40 pm-8:18 pm

1 stop5h 38m

$281

Grand JunctionOntario

GJT - ONT

GJTONT

Grand Junction Regnl

Sat 3/7

7:05 am-12:48 pm

1 stop6h 43m

Ontario

Tue 3/10

1:50 pm-8:37 pm

1 stop5h 47m

$281

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Fri 3/13

8:55 pm-12:10 am

1 stop4h 15m

Ontario

Tue 3/17

4:25 pm-9:20 pm

1 stop3h 55m

$318

VailOntario

EGE - ONT

EGEONT

Vail Eagle County

Fri 3/6

12:27 pm-4:22 pm

1 stop4h 55m

Ontario

Tue 3/10

11:58 pm-9:55 am

1 stop8h 57m

$339

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How to get the cheapest flight ticket from Colorado to Ontario

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 Ontario?

In general, May is the cheapest month to fly from Colorado to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $137. If you aren’t able to travel during the month of May, then book flights to Ontario from Colorado during August instead. Flights to Ontario in August, while not as cheap as those in May, still average around $142.

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

The cheapest day to depart on your flight to Ontario is on a Saturday when prices can be found for as low as $162. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Colorado to Ontario for around $213.

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

In the evening is the cheapest time of day to fly from Colorado to Ontario when you can find flight prices for as low as $171. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $197 on average. Flights to Ontario from Colorado at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Colorado to Ontario flight route?

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

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

You are more likely to see cheaper flights to Ontario from Colorado when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $177 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Colorado for as low as $76 on momondo.

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

There are 4 cabin classes available to choose from on Colorado to Ontario 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 Colorado to Ontario flights?

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

Cheap Colorado to Ontario flight deals and tips

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

Best Price Found	$78
Fastest flight time	2h 15m
Direct flights	Every day
Airports in Ontario	1 airport

The best one-way flight to Ontario from Colorado in the past 72 hours is $78. The best round-trip flight deal from Colorado to Ontario found on momondo in the last 72 hours is $123.

The fastest flight from Colorado to Ontario takes 2h 15m

Direct flights go from Colorado to Ontario every day.

There is 1 airport in Ontario. From Colorado there are direct flights to Ontario (ONT).

Search flight deals

When did momondo last update prices for flights from Colorado to Ontario Airport?
Prices for flights from Colorado to Ontario Airport refresh daily.
How many operators does momondo search for flights from Colorado to Ontario Airport?
As of February 2026, there are 5 operators available to choose from for flights from Colorado to Ontario Airport.
How old do you have to be to fly from Colorado to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Colorado to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Colorado to Ontario?
momondo data reveals that the most frequently booked plane model on the route from Colorado to Ontario is Boeing 737 MAX 8, representing 15.36% of all bookings. The subsequent popular models are Airbus A321neo at 12.18%, Boeing 737-800 at 10.88%, and Airbus A320neo at 10.79%.

Best airlines flying from Colorado to Ontario

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $63	Free Cancellation	Rating 5.7 3,052 reviews	Search Frontier flights
United Airlines	PriceFrom $118	Free Cancellation	Rating 7.4 9,254 reviews	Search United Airlines flights
Southwest	PriceFrom $127	Free Cancellation	Rating 8.0 4,280 reviews	Search Southwest flights
Delta	PriceFrom $196	Free Cancellation	Rating 7.9 8,172 reviews	Search Delta flights
American Airlines	PriceFrom $218	Free Cancellation	Rating 7.2 11,249 reviews	Search American Airlines flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from Colorado.

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

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

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

Once all potential Colorado to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes. momondo can track prices for Colorado to Ontario 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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Cheap flights from Colorado to Los Angeles from $22

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Colorado to Los Angeles departing on 3/7. 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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Frontier flights from Colorado to Ontario

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How to get the cheapest flight ticket from Colorado to Ontario

What is the cheapest month to fly to Ontario?

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

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

What is the cheapest Colorado to Ontario flight route?

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

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

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

There are 4 cabin classes available to choose from on Colorado to Ontario 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 Colorado to Ontario flights?

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

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

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

What airlines fly to Ontario?

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

5 flights are operational daily from Colorado to Ontario as of February 2026. The most popular departure time for this route is 11:00AM, with 51% of flights per day taking off in the evening.

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

As of February 2026, there are 36 flights per week flying from Colorado to Ontario. The most common day of the week flights depart is Mon, with 22% of flights taking off on this day.

How long does it take to fly to Ontario?

Average flight duration from Colorado to Ontario depends on which airport you fly into and out of. Flying from Aspen to Los Angeles is 2h 23m on average, while flying from Denver to Los Angeles is 2h 31m on average. Los Angeles is the most popular airport in Ontario.

Cheap Colorado to Ontario flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Ontario

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

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

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

What documentation or ID do you need to fly to Ontario Airport?

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

Best airlines flying from Colorado to Ontario

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

Why use momondo?

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

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

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

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

An easier way to manage your Ontario 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.

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Airports servicing California

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Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Los Angeles

List of cabin classes available on flights landing in Los Angeles. Availability may vary depending on flight origin and airline.

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