C$ 112 Find Cheap Flights from Ontario to Denver – Compare and Save

These are the earliest and latest flight times available from Ontario to Denver:

• Earliest: departs at 5:00 am and lands at 7:17 am
• Latest: departs at 5:40 pm and lands at 7:57 pm.

The flight takes about 2h 17m.

Only Economy Class is available on flights from Ontario to Denver.

A direct flight from Ontario to Denver takes 2h 17m, covering 2,115 km.

No, a passport is not required for this domestic route, but you will need another form of identification, such as a driver's licence.

Round-trip flights from Ontario to Denver range from C$ 204 to C$ 449, with an average of C$ 311 over the past 12 months. Anything below C$ 204 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 19% above the C$ 311 route average. Book 7 weeks before departure for the lowest fares.

On this route, direct flights are cheaper than layover options on average. Direct fares average C$ 312 round-trip, compared to C$ 398 via a layover through Las Vegas Harry Reid Intl (LAS).

There is no standard. Checked bag policies vary by airline on this route. Most carriers charge C$ 57–C$ 142 for the first checked bag in economy. Premium fares and elite status bookings typically include a free checked bag.

The Airbus A320neo family is used most often on this route, operated mainly by Frontier. Other aircraft seen on the route include Boeing 737 MAX 8 variants.

Morning is the busiest departure period on Ontario to Denver flights, with 63% leaving in that window. Afternoon departures account for 37%, Evening flights for 0%, and Night flights for 0%.

One-way fares from Ontario to Denver are currently lower than usual. Average one-way flight prices are about C$ 156, which is 27% below the typical average for this route.

Denver Intl Airport (DEN) hosts 5 major car rental companies, with daily rates starting from around C$ 22 for economy cars. Top options include:

• Routes Car & Truck Rentals
• Ace
• NU Car
• Europcar
• Hertz

Flights from Ontario to Denver usually depart from Ontario (ONT) and arrive at Denver Intl (DEN).

One-stop flights from Ontario to Denver most commonly connect through:

• Las Vegas Harry Reid Intl (LAS) – 80% of one-stop connections
• Salt Lake City (SLC) – 13% of one-stop connections
• Phoenix Sky Harbor Intl (PHX) – 5% of one-stop connections
• San Francisco (SFO) – 2% of one-stop connections

Yes. Flexible dates can save you up to 30% on flights from Ontario to Denver. Wednesday is the cheapest departure day at C$ 280 round-trip on average, while Sunday is the most expensive at C$ 397, a difference of C$ 117.

KAYAK's flexible dates feature shows options up to three days before and after your selected dates, making it easier to compare nearby fares.

3 airlines operate flights between Ontario and Denver. The airlines offering direct flights on this route include:

• Southwest
• Frontier
• United Airlines

Flying via Phoenix Sky Harbor Intl (PHX) gives the shortest average 1-stop total travel time at 4h 04m, compared with 5h 26m via Salt Lake City (SLC) and 7h 09m via Las Vegas Harry Reid Intl (LAS).

Denver is 1 hour ahead of Ontario (Mountain Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in Denver are Colorado Convention Center, 16th Street Mall, and Sheraton Denver Downtown Hotel. These are among the most viewed places in Denver on KAYAK.

Among airlines operating Ontario to Denver flights:

• Frontier: offers free seat selection
• Southwest: offers free seat selection
• United Airlines: offers extra legroom; offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Here are some options for this route, based on selected ticket types and cabin classes:

• Frontier: a carry-on bag and a checked bag in Economy Class
• Southwest: a carry-on bag and a checked bag in Economy Class
• United Airlines: a carry-on bag and a checked bag in Economy Class

Baggage allowance can vary by ticket type, cabin class, route, and airline, so always check the fare details before booking.