Find flights
Deals
When to book
FAQs

Cheap flights from Ontario to Denver from C$ 92

ONT — DEN
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Denver

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Denver

Wed 30/126:30 a.m. -
Nonstop2h 24m
Fri 1/111:49 a.m. -
1 stop6h 26m
Deal found 27/10C$ 164
Sat 5/1211:20 a.m. -
Nonstop2h 10m
Mon 7/128:15 p.m. -
Nonstop2h 30m
Deal found 28/10C$ 183
Mon 21/125:00 a.m. -
Nonstop2h 21m
Fri 25/127:35 p.m. -
Nonstop2h 25m
Deal found 29/10C$ 192
Fri 20/112:45 p.m. -
Nonstop2h 15m
Thu 26/118:05 a.m. -
Nonstop2h 30m
Deal found 28/10C$ 201
Sat 21/115:00 a.m. -
Nonstop2h 17m
Sat 21/117:25 p.m. -
Nonstop2h 26m
Deal found 28/10C$ 211
Wed 30/1210:48 p.m. -
1 stop12h 30m
Fri 1/17:08 p.m. -
1 stop13h 10m
Deal found 27/10C$ 214
Sat 21/115:00 a.m. -
Nonstop2h 17m
Fri 27/1111:15 a.m. -
Nonstop2h 18m
Deal found 25/10C$ 220
Mon 21/122:35 p.m. -
Nonstop2h 20m
Thu 24/126:05 a.m. -
1 stop4h 40m
Deal found 30/10C$ 234
Fri 4/1210:05 a.m. -
Nonstop2h 15m
Sun 6/1212:45 p.m. -
Nonstop2h 20m
Deal found 27/10C$ 248
Thu 10/1211:30 a.m. -
Nonstop2h 25m
Sat 2/17:08 p.m. -
1 stop3h 48m
Deal found 27/10C$ 250

Find flight deals from Ontario to Denver

Round-trip from

C$ 164

One-way from

C$ 92

Popular in

June

Cheapest in

February

Average price

C$ 371

Good round-trip deal

C$ 478 or less
Alaska Airlines
  • Alaska Airlines
  • 30/12-1/1
  • 1 total stop
  • 8h 50m total
  • Ontario to Denver
Search Deals
United Airlines
  • United Airlines
  • 26/11-31/12
  • Nonstop
  • 2h 17m total
  • Ontario to Denver
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (C$ 97 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Denver Intl.
Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sat 21/11

5:00 a.m.-8:17 a.m.

Nonstop2h 17m

Denver Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 162

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Wed 25/11

5:00 a.m.-8:17 a.m.

Nonstop2h 17m

Denver Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 162

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Mon 23/11

5:00 a.m.-8:17 a.m.

Nonstop2h 17m

Denver Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 166

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Wed 9/12

6:00 a.m.-11:59 a.m.

1 stop4h 59m

Denver Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 178

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Thu 17/12

5:00 a.m.-8:21 a.m.

Nonstop2h 21m

Denver Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 180

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Wed 23/12

5:00 a.m.-8:21 a.m.

Nonstop2h 21m

Denver Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 180

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sun 22/11

5:00 a.m.-8:17 a.m.

Nonstop2h 17m

Denver Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 208

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Sat 21/11

5:00 a.m.-8:17 a.m.

Nonstop2h 17m

Denver Intl

Fri 27/11

11:15 a.m.-12:33 p.m.

Nonstop2h 18m

C$ 220

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Wed 2/12

11:20 a.m.-8:17 p.m.

1 stop7h 57m

Denver Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 236

OntarioDenver

ONT Ontario - DEN Denver Intl

ONTDEN

Ontario

Thu 26/11

6:00 a.m.-11:59 a.m.

1 stop4h 59m

Denver Intl

Tue 1/12

10:43 a.m.-4:28 p.m.

1 stop6h 45m

C$ 276

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/10

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Ontario to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Ontario with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

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

How far ahead should I book a flight from Ontario to Denver?

The price you pay for your flight from Ontario to Denver may vary depending on when you book. For the best chance of a lower fare, look to book 71 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, February is the cheapest month in which you can book a flight from Ontario to Denver (average of C$ 235). Flying from Ontario to Denver in June is currently the most expensive (average of C$ 453). 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 ONT to DEN?

It’s typically best to fly out from Ontario to Denver in the afternoon. Doing so could potentially save you 53% on the flight price compared to flying in the morning, which is usually more expensive.

How much does it cost to fly round-trip from Ontario to Denver?

Airfare is below average for this route at the moment.

Ontario to Denver flights typically cost between C$ 229 and C$ 464 in December.
The cheapest round-trip price found within the last 5 days was C$ 164 on Multiple Airlines (30 Dec-1 Jan).

Related info for your journey

  • How popular is this Ontario to Denver flight route?

    Within the past month, 5 users have taken a look at flights from Ontario to Denver Intl.

  • How long is the flight from Ontario to Denver?

    There are many flights that can get you from Ontario to Denver in 2h 17m. Fly via United Airlines, Southwest, or Delta to get the fastest option. Airlines will cover a distance of 1315 km. This flight may include one or multiple stops.

  • What are the most reliable airlines from Ontario to Denver?

    Consider Frontier (96%), Volaris (96%) or Air Canada (88%) when booking your flight. These represent the most reliable airlines when flying from Ontario to Denver.

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

    Yes. In addition to deals on Ontario to Denver flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Denver.

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

    Yes. Cheapflights offers flight deals from Ontario to Denver 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 Ontario to Denver?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Denver (average of C$ 235). Flying from Ontario to Denver in June is currently the most expensive (average of C$ 453). 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

Travelling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Black Hawk

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Ontario to Denver

Las Vegas to Denver flights

Fly with Cheapflights

How does Cheapflights help users find flights from Ontario to Denver?

When you search for this flight from Ontario to Denver, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Denver?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ontario to Denver for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Ontario to Denver with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to Denver, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Ontario to Denver become cheaper?

Not ready to book yet? You can track prices for flights from Ontario to Denver on Cheapflights with our Price Alert feature and get notified when better prices are available.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.