How popular is this Colorado to Ontario flight route?

The Colorado to Ontario flight path was viewed by 83 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 Southwest ($49), Frontier ($50), and Alaska 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 cheapest flights from Colorado to Ontario?

While on average a flight from Colorado to Ontario is generally $135, our data shows the cheapest flight currently is $31. When looking at the most popular route, (Denver Intl - Ontario), you can expect to pay $96 for that flight.

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 (86%), United Airlines (82%) or Southwest (74%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Colorado to Ontario?

When booking a flight from Colorado to Ontario, you may want to consider flying on Frontier, United Airlines or Southwest as they are the most popular for this route.

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

To save up to 73% on this flight, we recommend booking at least 57 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Colorado to Ontario from $185 1-2 weeks out and tickets from $368 for flights departing within the next 72 hours.

What is the cheapest month to fly from Colorado to Ontario?

The best pricing can be found in the month of September. Prices to Ontario from Colorado average $179. You can even find prices in September for less than $179, as users have found deals to Ontario from as low as $56. The month of March appears to be one of the more expensive times to travel to Ontario from Colorado. Flying in the targeted month can save you up to 21%.

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.

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.

$49+ Flights from Colorado to Ontario

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Cheap flight deals from Colorado to Ontario

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$97 (Southwest)
One-way from	$49 (Southwest)
Popular in	March
Cheapest in	September
Average price	$218
Good round-trip deal	$100 or less
Good one-way deal	$61 or less

Provider with most accurate pricing for Denver Intl-Los Angeles flight deals.

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Provider most trusted by Cheapflights users for Denver Intl-Los Angeles flights.

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From Colorado to Ontario

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One-way flight from Colorado to Ontario

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Highest demand for flights based on searches. 1% potential increase in price ($2 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($4 potential savings vs. average RT price).

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Average for round-trip flights in March 2025

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Price to beat on a round-trip flight from Colorado to Ontario.

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Price to beat on a one-way flight from Colorado to Ontario.

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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 March 28, 2025.

Thu 5/19:40 pmDEN - ONT

Nonstop2h 20mSouthwest

Sun 5/49:30 pmONT - DEN

Nonstop2h 10mSouthwest

Deal found 3/27

$97

Fri 4/259:55 amDEN - ONT

Nonstop2h 26mFrontier

Sat 4/2612:59 amONT - DEN

Nonstop2h 17mFrontier

Deal found 3/28

$98

Sat 4/2611:16 amDEN - ONT

1 stop5h 43mAmerican Airlines

Sun 4/2712:50 pmONT - DEN

1 stop4h 16mAmerican Airlines

Deal found 3/27

$199

Wed 4/236:37 pmDEN - ONT

1 stop6h 21mAlaska Airlines

Fri 4/254:29 pmONT - DEN

1 stop6h 30mAlaska Airlines

Deal found 3/27

$206

Fri 4/188:15 amDEN - ONT

1 stop5h 01mDelta

Sat 4/261:20 pmONT - DEN

1 stop5h 34mDelta

Deal found 3/27

$217

Tue 5/136:50 pmCOS - ONT

1 stop3h 55mSouthwest

Sun 5/187:35 pmONT - COS

1 stop4h 20mSouthwest

Deal found 3/26

$219

Tue 4/224:39 pmCOS - ONT

1 stop8h 11mAmerican Airlines

Tue 4/2912:50 pmONT - COS

2 stops9h 56mAmerican Airlines

Deal found 3/26

$224

Wed 5/143:40 pmCOS - ONT

1 stop6h 13mUnited Airlines

Sun 5/184:15 pmONT - COS

1 stop6h 36mUnited Airlines

Deal found 3/27

$238

Sun 5/118:00 amCOS - ONT

1 stop5h 15mDelta

Tue 5/201:10 pmONT - COS

1 stop4h 43mDelta

Deal found 3/26

$249

Sat 4/268:20 amDEN - ONT

2 stops8h 12mMultiple Airlines

Fri 5/212:59 amONT - DEN

Nonstop2h 18mMultiple Airlines

Deal found 3/27

$262

Tue 4/298:00 amEGE - ONT

1 stop6h 49mAmerican Airlines

Tue 5/66:01 amONT - EGE

2 stops11h 51mAmerican Airlines

Deal found 3/26

$270

Sat 4/267:19 pmDEN - ONT

Nonstop2h 23mUnited Airlines

Mon 4/285:00 amONT - DEN

Nonstop2h 19mUnited Airlines

Deal found 3/27

$277

Best flights from Colorado to Ontario
Discover carefully curated flight deals from Colorado to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 28, 2025.

Thu 5/19:40 pmDEN - ONT

Nonstop2h 20mSouthwest

Mon 5/53:15 pmONT - DEN

Nonstop2h 15mSouthwest

Deal found 3/27

$97

Fri 4/259:55 amDEN - ONT

Nonstop2h 26mFrontier

Sat 4/2612:59 amONT - DEN

Nonstop2h 17mFrontier

Deal found 3/27

$98

Sat 4/267:19 pmDEN - ONT

Nonstop2h 23mUnited Airlines

Sun 4/275:00 amONT - DEN

Nonstop2h 19mUnited Airlines

Deal found 3/27

$157

Tue 4/222:39 pmDEN - ONT

1 stop6h 50mAlaska Airlines

Thu 4/244:29 pmONT - DEN

1 stop6h 30mAlaska Airlines

Deal found 3/27

$176

Sat 4/2611:16 amDEN - ONT

1 stop5h 43mAmerican Airlines

Sun 4/2712:50 pmONT - DEN

1 stop4h 16mAmerican Airlines

Deal found 3/27

$199

Fri 4/188:15 amDEN - ONT

1 stop5h 01mDelta

Sat 4/261:20 pmONT - DEN

1 stop5h 34mDelta

Deal found 3/27

$217

Sat 4/268:20 amDEN - ONT

2 stops8h 12mMultiple Airlines

Fri 5/212:59 amONT - DEN

Nonstop2h 18mMultiple Airlines

Deal found 3/27

$262

Tue 5/138:00 amCOS - ONT

1 stop5h 15mDelta

Tue 5/201:10 pmONT - COS

1 stop4h 43mDelta

Deal found 3/26

$219

Tue 4/224:39 pmCOS - ONT

1 stop8h 11mAmerican Airlines

Tue 4/2912:50 pmONT - COS

2 stops9h 56mAmerican Airlines

Deal found 3/26

$224

Wed 5/143:40 pmCOS - ONT

1 stop6h 13mUnited Airlines

Sun 5/184:15 pmONT - COS

1 stop6h 36mUnited Airlines

Deal found 3/27

$238

Tue 5/137:00 amCOS - ONT

2 stops6h 20mSouthwest

Sun 5/187:35 pmONT - COS

1 stop4h 20mSouthwest

Deal found 3/26

$258

Tue 4/298:00 amEGE - ONT

1 stop6h 49mAmerican Airlines

Tue 5/66:01 amONT - EGE

2 stops11h 51mAmerican Airlines

Deal found 3/26

$270

Last-minute flights from Colorado to Ontario
Discover last-minute flight deals from Colorado to Ontario. Data last updated March 28, 2025 and is based on user searches.

Thu 4/39:35 amCOS - ONT

1 stop4h 03mUnited Airlines

Sun 4/134:17 pmONT - COS

1 stop4h 19mUnited Airlines

Deal found 3/26

$527

Thu 4/33:20 pmEGE - ONT

1 stop6h 22mUnited Airlines

Fri 4/41:35 pmONT - EGE

1 stop20h 04mUnited Airlines

Deal found 3/27

$628

Fri 4/44:30 pmDEN - ONT

2 stops6h 20mSouthwest

Mon 4/75:40 amONT - DEN

1 stop5h 10mSouthwest

Deal found 3/26

$482

Sat 4/510:37 pmDEN - ONT

Nonstop2h 22mFrontier

Sat 4/2612:10 pmONT - DEN

Nonstop2h 22mFrontier

Deal found 3/27

$117

Sat 4/57:19 pmDEN - ONT

Nonstop2h 23mUnited Airlines

Thu 4/104:17 pmONT - DEN

Nonstop2h 27mUnited Airlines

Deal found 3/27

$307

Sun 4/66:46 pmDEN - ONT

1 stop4h 12mAmerican Airlines

Fri 4/1110:00 amONT - DEN

1 stop4h 22mAmerican Airlines

Deal found 3/27

$497

Mon 4/78:16 amDEN - ONT

1 stop5h 10mDelta

Sat 4/126:00 amONT - DEN

1 stop4h 13mDelta

Deal found 3/27

$327

Mon 4/75:38 pmDEN - ONT

1 stop7h 21mAlaska Airlines

Tue 4/87:00 amONT - DEN

1 stop5h 53mAlaska Airlines

Deal found 3/27

$356

Mon 4/75:11 pmDEN - ONT

1 stop4h 40mMultiple Airlines

Mon 4/146:55 amONT - DEN

2 stops11h 06mMultiple Airlines

Deal found 3/27

$398

Tue 4/84:35 pmDEN - ONT

2 stops6h 10mSouthwest

Thu 4/104:35 pmONT - DEN

1 stop5h 10mSouthwest

Deal found 3/27

$332

Fri 4/188:15 amDEN - ONT

1 stop5h 01mDelta

Sat 4/261:20 pmONT - DEN

1 stop5h 34mDelta

Deal found 3/27

$217

Tue 4/228:05 amCOS - ONT

1 stop5h 11mDelta

Tue 4/291:20 pmONT - COS

1 stop5h 02mDelta

Deal found 3/26

$219

One-way flights from Colorado to Ontario
Search for one-way flight options from Colorado to Ontario. Find affordable one-way fares based on user searches. Data last updated March 28, 2025.

Fri 4/189:40 pmDEN - ONT

Nonstop2h 20mSouthwest

Deal found 3/26

$49

Fri 5/210:37 pmDEN - ONT

Nonstop2h 22mFrontier

Deal found 3/27

$50

Tue 8/127:06 pmDEN - ONT

1 stop5h 53mAlaska Airlines

Deal found 3/27

$108

Tue 6/245:30 amDEN - ONT

1 stop4h 20mDelta

Deal found 3/27

$109

Sun 6/87:00 pmCOS - ONT

1 stop6h 15mSouthwest

Deal found 3/26

$110

Sun 4/62:58 pmEGE - ONT

1 stop19h 24mFrontier

Deal found 3/27

$115

Wed 5/287:45 pmDEN - ONT

Nonstop2h 19mUnited Airlines

Deal found 3/28

$129

Thu 4/243:30 pmCOS - ONT

1 stop6h 12mUnited Airlines

Deal found 3/27

$145

Thu 6/58:00 amDEN - ONT

1 stop8h 50mHawaiian Airlines

Deal found 3/27

$158

Wed 5/71:34 pmEGE - ONT

2 stops8h 00mUnited Airlines

Deal found 3/27

$173

Fri 6/205:42 pmGJT - ONT

1 stop4h 22mUnited Airlines

Deal found 3/28

$225

Mon 7/211:30 pmASE - ONT

2 stops10h 22mUnited Airlines

Deal found 3/27

$236

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

DenverOntario

DEN - ONT

DENONT

Denver Intl

Thu 5/1

9:40 pm-11:00 pm

Nonstop2h 20m

Ontario

Sun 5/4

9:30 pm-12:40 am

Nonstop2h 10m

$97

DenverOntario

DEN - ONT

DENONT

Denver Intl

Fri 4/25

9:55 am-11:21 am

Nonstop2h 26m

Ontario

Sat 4/26

12:59 am-4:16 am

Nonstop2h 17m

$98

DenverOntario

DEN - ONT

DENONT

Denver Intl

Tue 4/22

2:39 pm-8:29 pm

1 stop6h 50m

Ontario

Thu 4/24

4:29 pm-11:59 pm

1 stop6h 30m

$176

DenverOntario

DEN - ONT

DENONT

Denver Intl

Sat 4/26

11:16 am-3:59 pm

1 stop5h 43m

Ontario

Sun 4/27

12:50 pm-6:06 pm

1 stop4h 16m

$199

DenverOntario

DEN - ONT

DENONT

Denver Intl

Fri 4/18

8:15 am-12:16 pm

1 stop5h 01m

Ontario

Sat 4/26

1:20 pm-7:54 pm

1 stop5h 34m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Tue 5/13

8:00 am-12:15 pm

1 stop5h 15m

Ontario

Tue 5/20

1:10 pm-6:53 pm

1 stop4h 43m

$219

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Tue 4/22

4:39 pm-11:50 pm

1 stop8h 11m

Ontario

Tue 4/29

12:50 pm-11:46 pm

2 stops9h 56m

$224

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Wed 5/14

3:40 pm-8:53 pm

1 stop6h 13m

Ontario

Sun 5/18

4:15 pm-11:51 pm

1 stop6h 36m

$238

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Tue 5/13

7:00 am-12:20 pm

2 stops6h 20m

Ontario

Sun 5/18

7:35 pm-12:55 am

1 stop4h 20m

$258

DenverOntario

DEN - ONT

DENONT

Denver Intl

Sat 4/26

8:20 am-3:32 pm

2 stops8h 12m

Ontario

Fri 5/2

12:59 am-4:17 am

Nonstop2h 18m

$262

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

Showing 1-10 of 36 results

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.

Cheapflights Insights

Everything you need to know about your flight from Colorado to Ontario

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

Currently, August is the cheapest month in which you can book a flight from Colorado to Ontario (average of $246). Flying from Colorado to Ontario in March is currently the most expensive (average of $326). 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?

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

The most flights from USCO to ONT are scheduled on a Wednesday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in Ontario 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

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 a feel of what it's like to fly with Southwest, Alaska Airlines and Delta 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

4,273 reviews

Reviews

1 / 20

10.0

Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Southwest

8.1

Very good

4,273 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

10.0

Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Alaska Airlines

8.0

Very good

9,798 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

10.0

Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Delta

8.0

Very good

7,896 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

10.0

Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Hawaiian Airlines

7.9

Good

2,336 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

10.0

Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

United Airlines

7.4

Good

8,603 reviews

Southwest

8.1

Very good

4,273 reviews

Reviews

1 / 20

10.0

Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

Related info for your journey

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 83 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 Southwest ($49), Frontier ($50), and Alaska 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 (86%), United Airlines (82%) or Southwest (74%) 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 $135, our data shows the cheapest flight currently is $31. When looking at the most popular route, (Denver Intl - Ontario), you can expect to pay $96 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, August is the cheapest month in which you can book a flight from Colorado to Ontario (average of $246). Flying from Colorado to Ontario in March is currently the most expensive (average of $326). 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

Top 5 airlines flying from Colorado to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$52	Average$122	FlexibilityNo cancel fee	On-time62%
Southwest	Cheapest$117	Average$323	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$136	Average$349	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$250	Average$356	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$278	Average$374	FlexibilityNo cancel fee	On-time71%

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$49+ 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 4/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Colorado to Ontario with Cheapflights

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Cheap flight deals from Colorado to Ontario

Keep the following information in mind while searching for Colorado to Ontario flight deals. Data was last updated March 28, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Colorado to Ontario

Cheapest flights from Colorado to OntarioExplore 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 March 28, 2025.

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 March 28, 2025.

Cheapflights Fare Finder

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

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.

Cheapflights Insights

Everything you need to know about your flight from Colorado to Ontario

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

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 March 28, 2025.

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 March 28, 2025.

Rainfall in Ontario by month

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

Temperature in Ontario by month

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

Reviews of airlines servicing Ontario

Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta 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.

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?

How popular is this Colorado to Ontario flight route?

What are the cheapest airlines to fly from Colorado to Ontario one-way?

What are the most popular routes from Colorado to Ontario?

What are the most reliable airlines from Colorado to Ontario?

What are the cheapest flights from Colorado to Ontario?

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

How can I find direct flights from Colorado to Ontario?

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

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

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.

Top 5 airlines flying from Colorado to Ontario

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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 March 28, 2025.