$33 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.

Four cabin classes are available on flights from Ontario to Denver:

• Economy Class
• Premium Economy Class
• Business Class
• First Class

Prices vary by airline.

A nonstop flight from Ontario to Denver takes 2h 17m, covering 817 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Round-trip flights from Ontario to Denver range from $143 to $315, with an average of $219 over the past 12 months. Anything below $143 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 19% above the $219 route average. Book 7 weeks before departure for the lowest fares.

On this route, nonstop flights are cheaper than layover options on average. Nonstop fares average $219 round-trip, compared to $280 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 $40–$100 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% of flights 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 $80, which is 47% below the typical average for this route.

Denver Intl Airport (DEN) hosts 5 major car rental companies, with daily rates starting from around $16 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 $197 round-trip on average, while Sunday is the most expensive at $279, a difference of $82.

KAYAK's flexible dates feature shows options up to 3 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 nonstop flights on this route include:

• Southwest
• United Airlines
• Frontier

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, Coors Field and Ball Arena. 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 cabin bag and a checked bag in Economy Class
• Southwest: a cabin bag and a checked bag in Economy Class
• United Airlines: a cabin bag and a checked bag in Economy Class

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

There is a large network of transit options that connect to Denver International Airport (DEN). You can use the airport rail serving the eight stations which runs regularly every 15min during the day and every 30min at night. Also, you can opt for ground transportation such as hotel shuttles, taxis, ride shares, and rental car shuttles. However, if you are in a hurry, the most convenient option is to use a taxi.

Denver International Airport (DEN) has three global money exchange locations. They are located in Gates A, B, and Jeppesen Terminal Level 5. You can also use the airport exchange kiosk, although they have the worst exchange rates.

There are many ways you can get to Ontario Airport (ONT) from Ontario City Center. Public transits offer cheap and easy travel although takes longer to arrive at the airport. The station is right within ONT for easy passenger access. There is also the use of airport shuttles to provide transportation to passengers. Alternatively, you can use a taxi, which is the fastest way to get to the airport.

There are various options of nursing suites for passengers with kids at Denver International Airport (DEN). They are located at each of DEN’s concourses, offering excellent security and a peaceful environment to nurse after a long flight. Also, the suites are available throughout the day and night.