How popular is this Colorado to Ontario flight route?

The Colorado to Ontario flight path was viewed by 88 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 ($40), Southwest ($79), and United Airlines ($90).

What are the most popular routes from Colorado to Ontario?

While some choose either Colorado Springs - Ontario or Grand Junction Regnl - 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 $148, our data shows the cheapest flight currently is $35. When looking at the most popular route, (Denver Intl - Ontario), you can expect to pay $137 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 SkyWest Airlines (100%), Air Canada (86%) or United Airlines (81%) 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 79% 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 $179 1-2 weeks out and tickets from $363 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 $180. You can even find prices in September for less than $180, as users have found deals to Ontario from as low as $56. The month of December 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 14%.

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.

$40+ Flights from Colorado to Ontario

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Cheap flight deals from Colorado to Ontario

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$88 (CheapOair)
One-way from	$40 (Mytrip)
Popular in	December
Cheapest in	September
Average price	$176
Good round-trip deal	$139 or less
Good one-way deal	$91 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

Search Deals

One-way flight from Colorado to Ontario

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($7 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).

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Average for round-trip flights in April 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 April 17, 2025.

Sat 5/1010:37 pmDEN - ONT

Nonstop2h 22mFrontier

Sun 5/1112:16 pmONT - DEN

Nonstop2h 19mFrontier

Deal found 4/15

$88

Tue 5/137:30 pmDEN - ONT

Nonstop2h 23mUnited Airlines

Mon 5/195:05 amONT - DEN

Nonstop2h 19mUnited Airlines

Deal found 4/16

$137

Fri 5/166:15 amDEN - ONT

1 stop5h 45mSouthwest

Mon 5/193:15 pmONT - DEN

Nonstop2h 15mSouthwest

Deal found 4/16

$147

Wed 5/287:05 pmDEN - ONT

1 stop5h 52mMultiple Airlines

Sat 5/315:21 pmONT - DEN

Nonstop2h 24mMultiple Airlines

Deal found 4/17

$182

Fri 5/95:30 amDEN - ONT

1 stop4h 41mDelta

Thu 5/154:57 pmONT - DEN

1 stop4h 33mDelta

Deal found 4/16

$217

Sat 5/103:40 pmCOS - ONT

1 stop6h 13mUnited Airlines

Sat 5/174:15 pmONT - COS

1 stop4h 21mUnited Airlines

Deal found 4/16

$218

Thu 5/88:20 amDEN - ONT

1 stop16h 38mAlaska Airlines

Mon 5/124:29 pmONT - DEN

1 stop6h 30mAlaska Airlines

Deal found 4/16

$294

Thu 5/156:55 amCOS - ONT

1 stop5h 05mSouthwest

Thu 5/225:20 amONT - COS

1 stop5h 05mSouthwest

Deal found 4/17

$307

Thu 9/181:20 pmGJT - ONT

1 stop5h 09mUnited Airlines

Sun 9/215:40 amONT - GJT

1 stop5h 35mUnited Airlines

Deal found 4/16

$349

Sat 5/1010:34 amCOS - ONT

2 stops8h 49mAmerican Airlines

Sat 5/171:14 pmONT - COS

2 stops9h 31mAmerican Airlines

Deal found 4/16

$363

Thu 6/59:26 amASE - ONT

1 stop4h 05mUnited Airlines

Sun 6/85:10 amONT - ASE

1 stop4h 39mUnited Airlines

Deal found 4/17

$371

Fri 5/23:21 pmEGE - ONT

1 stop6h 32mUnited Airlines

Sun 5/45:05 amONT - EGE

1 stop6h 22mUnited Airlines

Deal found 4/17

$389

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 April 17, 2025.

Sat 5/1010:37 pmDEN - ONT

Nonstop2h 22mFrontier

Sun 5/1112:16 pmONT - DEN

Nonstop2h 19mFrontier

Deal found 4/15

$88

Tue 5/136:45 pmDEN - ONT

Nonstop2h 20mSouthwest

Mon 5/191:20 pmONT - DEN

Nonstop2h 15mSouthwest

Deal found 4/16

$137

Wed 5/287:05 pmDEN - ONT

1 stop5h 52mMultiple Airlines

Fri 5/3012:59 amONT - DEN

Nonstop2h 18mMultiple Airlines

Deal found 4/17

$182

Wed 5/148:01 amDEN - ONT

1 stop4h 49mAmerican Airlines

Wed 5/216:01 amONT - DEN

1 stop5h 09mAmerican Airlines

Deal found 4/16

$199

Wed 5/711:15 amDEN - ONT

Nonstop2h 23mUnited Airlines

Wed 5/74:15 pmONT - DEN

Nonstop2h 20mUnited Airlines

Deal found 4/16

$202

Fri 5/95:30 amDEN - ONT

1 stop4h 41mDelta

Sun 5/114:57 pmONT - DEN

1 stop4h 33mDelta

Deal found 4/16

$217

Sat 5/177:05 pmDEN - ONT

1 stop5h 52mAlaska Airlines

Sat 5/244:45 pmONT - DEN

1 stop6h 20mAlaska Airlines

Deal found 4/16

$233

Sat 5/103:40 pmCOS - ONT

1 stop6h 13mUnited Airlines

Sat 5/174:15 pmONT - COS

1 stop4h 21mUnited Airlines

Deal found 4/16

$218

Tue 8/1210:54 amCOS - ONT

2 stops11h 41mAmerican Airlines

Tue 8/192:59 pmONT - COS

1 stop7h 25mAmerican Airlines

Deal found 4/17

$296

Tue 6/177:35 pmCOS - ONT

1 stop4h 05mSouthwest

Wed 6/255:30 amONT - COS

1 stop3h 55mSouthwest

Deal found 4/17

$297

Tue 10/145:55 pmCOS - ONT

1 stop6h 51mDelta

Fri 10/175:05 pmONT - COS

1 stop4h 24mDelta

Deal found 4/17

$362

Thu 9/181:20 pmGJT - ONT

1 stop5h 09mUnited Airlines

Sun 9/215:40 amONT - GJT

1 stop5h 35mUnited Airlines

Deal found 4/16

$349

Last-minute flights from Colorado to Ontario
Discover last-minute flight deals from Colorado to Ontario. Data last updated April 17, 2025 and is based on user searches.

Wed 4/237:15 amMTJ - ONT

1 stop6h 23mUnited Airlines

Wed 5/75:05 amONT - MTJ

1 stop6h 30mUnited Airlines

Deal found 4/16

$432

Wed 4/237:00 amDEN - ONT

1 stop9h 32mAlaska Airlines

Mon 4/286:00 amONT - DEN

2 stops14h 15mAlaska Airlines

Deal found 4/16

$475

Wed 4/237:05 amGJT - ONT

1 stop6h 33mUnited Airlines

Wed 4/304:17 pmONT - GJT

1 stop4h 56mUnited Airlines

Deal found 4/17

$479

Wed 4/2311:57 amMTJ - ONT

2 stops11h 01mAmerican Airlines

Wed 5/77:25 pmONT - MTJ

2 stops14h 52mAmerican Airlines

Deal found 4/16

$612

Thu 4/243:31 pmASE - ONT

1 stop6h 11mUnited Airlines

Mon 4/284:23 pmONT - ASE

1 stop3h 53mUnited Airlines

Deal found 4/16

$439

Thu 4/248:15 amDEN - ONT

1 stop5h 01mDelta

Sun 4/276:00 amONT - DEN

1 stop6h 25mDelta

Deal found 4/16

$565

Thu 4/247:19 pmDEN - ONT

Nonstop2h 23mUnited Airlines

Sun 4/274:17 pmONT - DEN

Nonstop2h 20mUnited Airlines

Deal found 4/16

$689

Thu 4/2412:29 pmASE - ONT

2 stops10h 29mAmerican Airlines

Tue 4/297:25 pmONT - ASE

2 stops15h 26mAmerican Airlines

Deal found 4/16

$828

Fri 4/2510:40 amCOS - ONT

1 stop5h 37mUnited Airlines

Sat 4/261:35 pmONT - COS

1 stop4h 43mUnited Airlines

Deal found 4/16

$427

Fri 4/2512:41 pmCOS - ONT

2 stops10h 17mAmerican Airlines

Sat 4/266:15 amONT - COS

2 stops8h 34mAmerican Airlines

Deal found 4/16

$483

Sat 4/265:29 pmDEN - ONT

1 stop4h 54mFrontier

Sat 4/2612:59 amONT - DEN

Nonstop2h 17mFrontier

Deal found 4/17

$189

Sat 4/263:55 pmDEN - ONT

2 stops6h 15mSouthwest

Mon 4/284:35 pmONT - DEN

1 stop5h 10mSouthwest

Deal found 4/17

$412

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 April 17, 2025.

Sun 5/1110:37 pmDEN - ONT

Nonstop2h 22mFrontier

Deal found 4/16

$40

Sun 5/118:50 pmDEN - ONT

1 stop3h 55mSouthwest

Deal found 4/16

$79

Sat 5/1710:10 amEGE - ONT

1 stop8h 37mFrontier

Deal found 4/17

$89

Tue 7/17:35 pmDEN - ONT

Nonstop2h 19mUnited Airlines

Deal found 4/16

$90

Tue 7/112:14 pmDEN - ONT

1 stop4h 59mAmerican Airlines

Deal found 4/17

$100

Wed 5/287:05 pmDEN - ONT

1 stop5h 52mAlaska Airlines

Deal found 4/16

$108

Sat 7/126:30 pmDEN - ONT

1 stop5h 13mDelta

Deal found 4/16

$109

Sun 6/88:15 amCOS - ONT

1 stop5h 02mDelta

Deal found 4/17

$110

Tue 5/137:30 amCOS - ONT

1 stop6h 08mUnited Airlines

Deal found 4/16

$150

Sat 5/241:35 pmMTJ - ONT

1 stop4h 52mUnited Airlines

Deal found 4/16

$169

Sat 7/56:00 amDEN - ONT

1 stop8h 26mHawaiian Airlines

Deal found 4/16

$204

Sun 6/87:00 pmCOS - ONT

2 stops5h 55mSouthwest

Deal found 4/17

$209

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

Sat 5/10

10:37 pm-11:59 pm

Nonstop2h 22m

Ontario

Sun 5/11

12:16 pm-3:35 pm

Nonstop2h 19m

$88

DenverOntario

DEN - ONT

DENONT

Denver Intl

Tue 5/13

7:30 pm-8:53 pm

Nonstop2h 23m

Ontario

Mon 5/19

5:05 am-8:24 am

Nonstop2h 19m

$137

DenverOntario

DEN - ONT

DENONT

Denver Intl

Fri 5/16

6:15 am-11:00 am

1 stop5h 45m

Ontario

Mon 5/19

3:15 pm-6:30 pm

Nonstop2h 15m

$147

DenverOntario

DEN - ONT

DENONT

Denver Intl

Wed 5/28

7:05 pm-11:57 pm

1 stop5h 52m

Ontario

Fri 5/30

12:59 am-4:17 am

Nonstop2h 18m

$182

DenverOntario

DEN - ONT

DENONT

Denver Intl

Fri 5/9

5:30 am-9:11 am

1 stop4h 41m

Ontario

Sun 5/11

4:57 pm-10:30 pm

1 stop4h 33m

$217

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Sat 5/10

3:40 pm-8:53 pm

1 stop6h 13m

Ontario

Sat 5/17

4:15 pm-9:36 pm

1 stop4h 21m

$218

DenverOntario

DEN - ONT

DENONT

Denver Intl

Sat 5/17

7:05 pm-11:57 pm

1 stop5h 52m

Ontario

Sat 5/24

4:45 pm-12:05 am

1 stop6h 20m

$233

DenverOntario

DEN - ONT

DENONT

Denver Intl

Wed 5/14

6:37 pm-11:58 pm

1 stop6h 21m

Ontario

Wed 5/21

4:45 pm-12:05 am

1 stop6h 20m

$236

Colorado SpringsOntario

COS - ONT

COSONT

Colorado Springs

Thu 5/15

6:55 am-11:00 am

1 stop5h 05m

Ontario

Thu 5/22

5:20 am-11:25 am

1 stop5h 05m

$307

Grand JunctionOntario

GJT - ONT

GJTONT

Grand Junction Regnl

Thu 9/18

1:20 pm-5:29 pm

1 stop5h 09m

Ontario

Sun 9/21

5:40 am-12:15 pm

1 stop5h 35m

$349

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 33 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 $328). 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 Thursday (13 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 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 Alaska Airlines, Southwest 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.

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Alaska Airlines

8.0

Very good

9,882 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Southwest

8.0

Very good

4,280 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Delta

8.0

Very good

7,917 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Hawaiian Airlines

7.9

Good

2,382 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

United Airlines

7.4

Good

8,667 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 88 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 ($40), Southwest ($79), and United Airlines ($90).
What are the most popular routes from Colorado to Ontario?
While some choose either Colorado Springs - Ontario or Grand Junction Regnl - 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 SkyWest Airlines (100%), Air Canada (86%) or United Airlines (81%) 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 $148, our data shows the cheapest flight currently is $35. When looking at the most popular route, (Denver Intl - Ontario), you can expect to pay $137 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 $328). 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$55	Average$126	FlexibilityNo cancel fee	On-time62%
Southwest	Cheapest$117	Average$326	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$137	Average$345	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$218	Average$356	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$278	Average$373	FlexibilityNo cancel fee	On-time71%

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$40+ 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 5/11. 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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3. Compare prices and book

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 April 17, 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 April 17, 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 April 17, 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 April 17, 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 April 17, 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 Alaska Airlines, Southwest 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 April 17, 2025.