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

80 flights are operational weekly from Ontario to Colorado as of June 2026. The most popular departure day for this route is Mon, with 20% of flights per week taking off on this day.

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

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

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

The number of flights available between Ontario and Colorado is 11 per day as of June 2026. The most frequent departure time is 6:00AM, with 39% of daily flights leaving at noon.

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 9 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

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 June 2026, 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.

$88 Cheap Flights from Ontario to Colorado in 2026

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Find the cheapest flights from Ontario to Colorado

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

2:55 pm - 6:17 pm

ONT

DEN

2h 22mnonstop

10:34 pm - 11:55 pm

DEN

ONT

2h 21mnonstop

$129Frontier

Mon, Sep 21 - Sat, Oct 3

6:00 am - 9:26 am

ONT

DEN

2h 26mnonstop

9:15 am - 10:43 am

DEN

ONT

2h 28mnonstop

$132Frontier

Tue, Sep 29 - Tue, Oct 20

6:35 pm - 11:50 pm

ONT

COS

4h 15m

1 stop

7:55 pm - 11:05 pm

COS

ONT

4h 10m

1 stop

$197Southwest

Wed, Jul 15 - Wed, Jul 22

5:00 am - 10:44 am

ONT

COS

4h 44m

1 stop

1:29 pm - 8:31 pm

COS

ONT

8h 02m

2 stops

$202United Airlines

Tue, Sep 22 - Tue, Sep 29

5:05 pm - 10:28 pm

ONT

COS

4h 23m

1 stop

6:16 pm - 10:23 pm

COS

ONT

5h 07m

1 stop

$210Delta

Tue, Aug 11 - Sat, Aug 15

5:05 pm - 10:28 pm

ONT

COS

4h 23m

1 stop

6:16 pm - 10:23 pm

COS

ONT

5h 07m

1 stop

$222Delta

Sat, Aug 8 - Sat, Aug 15

6:35 pm - 11:50 pm

ONT

COS

4h 15m

1 stop

6:00 am - 11:30 am

COS

ONT

6h 30m

1 stop

$268Southwest

Wed, Jul 15 - Wed, Jul 22

6:11 am - 11:31 am

ONT

GJT

4h 20m

1 stop

8:35 am - 12:02 pm

GJT

ONT

4h 27m

1 stop

$290American Airlines

Thu, Jul 16 - Wed, Jul 22

5:00 am - 12:31 pm

ONT

GJT

6h 31m

1 stop

1:40 pm - 10:59 pm

GJT

ONT

10h 19m

2 stops

$299United Airlines

Thu, Aug 6 - Fri, Aug 14

6:11 am - 11:31 am

ONT

GJT

4h 20m

1 stop

6:54 pm - 9:43 pm

GJT

ONT

3h 49m

1 stop

$319American Airlines

Tue, Jul 14 - Mon, Jul 20

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Frontier flights from Ontario to Colorado

Our best Frontier deals on Ontario to Colorado flight tickets

Frontier

Sep 21

ONT2:55 pmOntario

2h 22m

DEN6:17 pmDenver Intl

Oct 1

DEN9:15 amDenver Intl

2h 28m

ONT10:43 amOntario

$129

Frontier

Sep 29

ONT6:00 amOntario

2h 26m

DEN9:26 amDenver Intl

Oct 20

DEN9:15 amDenver Intl

2h 28m

ONT10:43 amOntario

$132

Frontier

Jul 14

ONT6:00 amOntario

2h 24m

DEN9:24 amDenver Intl

Jul 18

DEN8:45 amDenver Intl

2h 19m

ONT10:04 amOntario

$141

United Airlines flights from Ontario to Colorado

Our best United Airlines deals on Ontario to Colorado flight tickets

United Airlines

Jul 22

ONT5:00 amOntario

2h 20m

DEN8:20 amDenver Intl

Jul 25

DEN6:00 amDenver Intl

7h 12m

1 stop

ONT12:12 pmOntario

$187

United Airlines

Sep 22

ONT5:00 amOntario

4h 44m

1 stop

COS10:44 amColorado Springs

Sep 29

COS1:29 pmColorado Springs

8h 02m

2 stops

ONT8:31 pmOntario

$202

United Airlines

Aug 12

ONT5:00 amOntario

7h 17m

1 stop

COS1:17 pmColorado Springs

Aug 19

COS11:30 amColorado Springs

9h 31m

2 stops

ONT8:01 pmOntario

$282

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Mon 9/21

2:55 pm-6:17 pm

Nonstop2h 22m

Denver Intl

Sat 10/3

10:34 pm-11:55 pm

Nonstop2h 21m

$129

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 9/29

6:00 am-9:26 am

Nonstop2h 26m

Denver Intl

Tue 10/20

9:15 am-10:43 am

Nonstop2h 28m

$132

OntarioColorado Springs

ONT - COS

ONTCOS

Ontario

Wed 7/15

6:35 pm-11:50 pm

1 stop4h 15m

Colorado Springs

Wed 7/22

7:55 pm-11:05 pm

1 stop4h 10m

$197

OntarioColorado Springs

ONT - COS

ONTCOS

Ontario

Tue 9/22

5:00 am-10:44 am

1 stop4h 44m

Colorado Springs

Tue 9/29

1:29 pm-8:31 pm

2 stops8h 02m

$202

OntarioColorado Springs

ONT - COS

ONTCOS

Ontario

Tue 8/11

5:05 pm-10:28 pm

1 stop4h 23m

Colorado Springs

Sat 8/15

6:16 pm-10:23 pm

1 stop5h 07m

$210

OntarioColorado Springs

ONT - COS

ONTCOS

Ontario

Sat 8/8

5:05 pm-10:28 pm

1 stop4h 23m

Colorado Springs

Sat 8/15

6:16 pm-10:23 pm

1 stop5h 07m

$222

OntarioColorado Springs

ONT - COS

ONTCOS

Ontario

Wed 7/15

6:35 pm-11:50 pm

1 stop4h 15m

Colorado Springs

Wed 7/22

6:00 am-11:30 am

1 stop6h 30m

$268

OntarioGrand Junction

ONT - GJT

ONTGJT

Ontario

Thu 7/16

6:11 am-11:31 am

1 stop4h 20m

Grand Junction Regnl

Wed 7/22

8:35 am-12:02 pm

1 stop4h 27m

$290

OntarioGrand Junction

ONT - GJT

ONTGJT

Ontario

Thu 8/6

5:00 am-12:31 pm

1 stop6h 31m

Grand Junction Regnl

Fri 8/14

1:40 pm-10:59 pm

2 stops10h 19m

$299

OntarioGrand Junction

ONT - GJT

ONTGJT

Ontario

Tue 7/14

6:11 am-11:31 am

1 stop4h 20m

Grand Junction Regnl

Mon 7/20

6:54 pm-9:43 pm

1 stop3h 49m

$319

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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 $39. The month of February is another great option to travel to Colorado, with average flight prices from Ontario averaging around $40.

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

The cheapest day to depart from Ontario to Colorado is on a Thursday when prices can be found for as low as $286. On the other hand, Monday 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 $348.

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 $207. At noon is when there is more demand to fly to Colorado, so prices are often more expensive at around $446 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 from Ontario 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 $203 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 $159 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	$180
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 $180. The best round-trip flight deal from Ontario to Colorado found on momondo in the last 72 hours is $278.

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

Frequently asked questions about flying from Ontario to Colorado

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 June 2026, 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 Airbus A320neo, making up 12.88% of the total bookings. Other popular models include Boeing 737 MAX 8 with 12.84%, Airbus A320-100/200 with 10.36%, and Boeing 737-800 with 10.23%.

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 $62	Free Cancellation	Rating 5.6 2,877 reviews	Search Frontier flights
Southwest	PriceFrom $157	Free Cancellation	Rating 7.9 4,241 reviews	Search Southwest flights
United Airlines	PriceFrom $157	Free Cancellation	Rating 7.4 9,865 reviews	Search United Airlines flights
Delta	PriceFrom $172	Free Cancellation	Rating 7.8 8,420 reviews	Search Delta flights
American Airlines	PriceFrom $211	Free Cancellation	Rating 7.1 11,715 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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Popular cities in Colorado

Flights to New Yorkfrom $62

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Flights to Las Vegasfrom $56

Flights to Washington, D.C.from $55

Flights to Bostonfrom $72

Flights to Atlantafrom $58

Flights to Fort Lauderdalefrom $59

Flights to Dallasfrom $72

Cheap flights from Ontario to Colorado from $89

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 7/22. 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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Frontier flights from Ontario to Colorado

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Our best United Airlines deals on Ontario to Colorado flight tickets

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How to get the cheapest flight ticket from Ontario to Colorado

What is the cheapest month to fly to Colorado?

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?

What is the cheapest Ontario to Colorado flight route?

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

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

Can stopping save me money on Ontario to Colorado flights?

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

What airlines fly to Colorado?

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

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

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

Frequently asked questions about flying 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?

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

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