$23 Find Cheap Flights from Denver to Ontario - Compare and Save

Suppose you want to travel from ONT to your destination of choice in Ontario with a taxi. In that case, you can easily find one to travel aboard on the curbside outside the International Arrivals Terminal. As taxis from the airport to ONT travel faster than the public buses that serve this route, traveling aboard a taxi would be wise if you want to travel quickly.

ONT has plenty of restaurants. In this airport's Terminal 2, you can eat at Cross Grain Brewhouse, Harvest & Grounds, and Wolfgang Puck Pizza, while in Terminal 4, you can grab a bite at Coffee Bean & Tea Leaf, Rock & Brews, and Wahoo's Fish Tacos.

If you'd like to park your car long-term at DEN, you can do so at three long-term on-site parking options at DEN. They include the East and West Economy Lots, Pikes Peak Lot, and Mt. Elbert Lot. You can count on finding your car intact upon return at any of these lots, as they all boast tight security.

If you want to pray privately before departing DEN, you'll get the chance to do so, given that DEN is home to a prayer room on the East Side of the Jeppesen Terminal. You'll be allowed to enter this room, irrespective of religion, as it is an interfaith chapel. Since this room is open 24h a day, you can visit it anytime.

Among airlines operating Denver to Ontario 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.

3 airlines operate flights between Denver and Ontario. The airlines offering nonstop flights on this route include:
• Southwest
• Frontier
• United Airlines

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

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

• United Airlines: a cabin bag and a checked bag in Economy Class
• Frontier: a cabin bag in Economy Class class
• Southwest: a cabin bag in Economy Class class

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

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

On this route, nonstop flights are cheaper than layover options on average. Nonstop fares average $211 round-trip, compared to $356 via a layover through Phoenix Sky Harbor Intl (PHX).

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.

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

• Las Vegas Harry Reid Intl (LAS) - 96% of one-stop connections
• Phoenix Sky Harbor Intl (PHX) - 2% of one-stop connections
• Salt Lake City (SLC) - 2% of one-stop connections

Las Vegas Harry Reid Intl (LAS) handles the largest share of one-stop connections on this route.

On the Denver to Ontario route, being flexible with your departure day can save you up to 24%. Saturday is the cheapest day at $194 round-trip on average, while Sunday is the most expensive at $253: a $59 difference. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

Morning is the busiest departure period on Denver to Ontario flights, with 43% of flights leaving in that window. Night departures account for 42%, evening flights for 14%, and afternoon flights for 1%.

Some of the most popular sights in Ontario are Ontario Convention Center, Ontario Mills and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

A nonstop flight from Denver to Ontario takes 2h 22m, covering 817 miles.

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

• Earliest: departs at 8:00 am and lands at 10:22 am
• Latest: departs at 10:34 pm and lands at 12:56 am.

The flight takes about 2h 22m.

Last-minute fares on this route - booked within 2 weeks of departure - run 35% above the route average of $215. Book 23 weeks before departure for the lowest fares.

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.

One-way fares from Denver to Ontario are currently lower than usual. Average one-way flight prices are about $77, which is 53% below the typical average for this route.

Flying via Phoenix Sky Harbor Intl (PHX) gives the shortest average 1-stop total travel time at 4h 27m, compared with 5h 38m via Salt Lake City (SLC) and 6h 05m via Las Vegas Harry Reid Intl (LAS).

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

Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates starting from around $18 for economy cars. Top options include:
· Fox
· Thrifty
· Europcar
· Dollar
· Alamo

Round-trip flights from Denver to Ontario range from $134 to $308, with an average of $215 over the past 12 months. Anything below $134 counts as a good deal.