Ontario

$132+ Cheap flights from Colorado to Ontario

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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — YYZ
ago. 5 — ago. 121
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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 julio 31, 2025.

Round-trip from

$285
(Kiwi.com)

One-way from

$132
(Kiwi.com)

Popular in

November

Cheapest in

March

Average price

$522

Good round-trip deal

$478 or less

Good one-way deal

$241 or less
From Colorado to Ontario
One-way flight from Colorado to Ontario
Highest demand for flights based on searches. 7% potential increase in price ($38 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($10 potential savings vs. average RT price).
Average for round-trip flights in July 2025
Price to beat on a round-trip flight from Colorado to Ontario.
Price to beat on a one-way flight from Colorado to Ontario.

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 julio 31, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/312:15 pmDEN - YYZ
1 stop10h 07mWestJet
dom. 9/710:00 amYYZ - DEN
1 stop10h 48mWestJet
Deal found 7/30$285
This Mytrip deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/412:15 pmDEN - YYZ
1 stop16h 25mMultiple Airlines
dom. 9/79:40 pmYYZ - DEN
1 stop15h 44mMultiple Airlines
Deal found 7/29$293
This Kiwi.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/135:50 pmDEN - YTZ
1 stop16h 27mMultiple Airlines
mar. 9/163:35 pmYTZ - DEN
1 stop19h 38mMultiple Airlines
Deal found 7/29$302
This Mytrip deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/312:15 pmDEN - YHM
1 stop10h 25mMultiple Airlines
sáb. 9/66:55 pmYHM - DEN
1 stop18h 29mMultiple Airlines
Deal found 7/31$316
This Flightnetwork deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/189:40 amDEN - YTZ
1 stop8h 06mAir Canada
dom. 8/2412:25 pmYTZ - DEN
1 stop7h 55mAir Canada
Deal found 7/28$318
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/312:15 pmDEN - YUL
1 stop23h 55mMultiple Airlines
vie. 9/56:45 amYUL - DEN
2 stops18h 28mMultiple Airlines
Deal found 7/31$323
This Mytrip deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/412:15 pmDEN - YHM
1 stop10h 25mWestJet
dom. 9/76:00 amYHM - DEN
1 stop14h 48mWestJet
Deal found 7/30$331
This Flightnetwork deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/187:45 amDEN - YYZ
Nonstop3h 13mAir Canada
dom. 8/246:20 pmYYZ - DEN
Nonstop3h 40mAir Canada
Deal found 7/28$331
This Mytrip deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/512:15 pmDEN - YKF
1 stop15h 00mMultiple Airlines
dom. 9/76:00 amYKF - DEN
1 stop14h 48mMultiple Airlines
Deal found 7/30$336
This FlightHub deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/2612:15 pmDEN - YUL
1 stop10h 28mWestJet
sáb. 8/306:45 amYUL - DEN
2 stops30h 42mWestJet
Deal found 7/30$361
This Trip.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/2512:15 pmDEN - YOW
1 stop10h 26mWestJet
jue. 8/287:15 pmYOW - DEN
1 stop18h 12mWestJet
Deal found 7/30$366
This Air Canada deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/187:05 pmDEN - YOW
1 stop11h 18mAir Canada
vie. 9/269:35 amYOW - DEN
1 stop11h 48mAir Canada
Deal found 7/29$374

Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 31, 2025.
Use the filters below to find and compare flights from Colorado to Ontario that are best for you.

Fly from

Colorado

Fly to

Ontario

Route

Depart

Return

Price

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

mié. 9/3

12:15 pm-12:22 am

1 stop10h 07m

Toronto Pearson Intl

dom. 9/7

10:00 am-6:48 pm

1 stop10h 48m

$285

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

jue. 9/4

12:15 pm-6:40 am

1 stop16h 25m

Toronto Pearson Intl

dom. 9/7

9:40 pm-11:24 am

1 stop15h 44m

$293

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

sáb. 9/13

5:50 pm-12:17 pm

1 stop16h 27m

Toronto Island

mar. 9/16

3:35 pm-9:13 am

1 stop19h 38m

$302

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

mié. 9/3

12:15 pm-12:40 am

1 stop10h 25m

Hamilton

sáb. 9/6

6:55 pm-11:24 am

1 stop18h 29m

$316

DenverToronto

DEN - YTZ

DENYTZ

Denver Intl

lun. 8/18

9:40 am-7:46 pm

1 stop8h 06m

Toronto Island

dom. 8/24

12:25 pm-6:20 pm

1 stop7h 55m

$318

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

mié. 9/3

12:15 pm-2:10 pm

1 stop23h 55m

Montreal Pierre Elliott Trudeau Intl

vie. 9/5

6:45 am-11:13 pm

2 stops18h 28m

$323

DenverHamilton

DEN - YHM

DENYHM

Denver Intl

jue. 9/4

12:15 pm-12:40 am

1 stop10h 25m

Hamilton

dom. 9/7

6:00 am-6:48 pm

1 stop14h 48m

$331

DenverToronto

DEN - YYZ

DENYYZ

Denver Intl

lun. 8/18

7:45 am-12:58 pm

Nonstop3h 13m

Toronto Pearson Intl

dom. 8/24

6:20 pm-8:00 pm

Nonstop3h 40m

$331

DenverToronto

DEN - YKF

DENYKF

Denver Intl

vie. 9/5

12:15 pm-5:15 am

1 stop15h 00m

Toronto Region of Waterloo Intl

dom. 9/7

6:00 am-6:48 pm

1 stop14h 48m

$336

DenverMontreal

DEN - YUL

DENYUL

Denver Intl

mar. 8/26

12:15 pm-12:43 am

1 stop10h 28m

Montreal Pierre Elliott Trudeau Intl

sáb. 8/30

6:45 am-11:27 am

2 stops30h 42m

$361

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 52 results
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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 Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of $243). Flying from Colorado to Region of Ontario in August is currently the most expensive (average of $348). 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 ON?

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 julio 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Region of Ontario as you normally would.

Weekly flight availability from Colorado to Region of 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 julio 31, 2025.

The most flights from USCO to CAON are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (9 on average).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated julio 31, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and United Airlines from Colorado to Ontario have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
8.0
Very good

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Crew

8.5

Entertainment

7.1

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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

    The cheapest airline one-way is WestJet, with whom users have recently found tickets for as low as $133. However, be on the lookout for offers from Air Canada and Sun Country Air, as they are both options that can get you from Colorado to Region of Ontario for a low price.

  • 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 Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from Colorado to Region of Ontario (average of $243). Flying from Colorado to Region of Ontario in August is currently the most expensive (average of $348). 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

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Alternative routes for Colorado to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from Colorado to Ontario

Discover the top 4 airlines that operate flights from Colorado to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$143Average$303FlexibilityNo cancel feeOn-time60%
DeltaCheapest$150Average$356FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$180Average$517FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$229Average$511FlexibilityNo cancel feeOn-time67%

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