Find flights
Deals
Insights
When to book
FAQs & Tips
Direct Flights
Airlines

DEN - ONT

Find cheap flights from Denver to Ontario

1 adult
0 bags
Sat 1/6
Sat 8/6

Search hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Ontario, as well as popular online travel agencies
In the last 7 days, travellers have searched 43,740,974 times on KAYAK, and here's why:

Save 28% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Flights from Denver to Ontario - Travel Insights & Trends

Get data-powered insights and trends into flights from Denver to Ontario to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Denver to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Denver to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Denver to Ontario is January, where tickets cost £76 on average. On the other hand, the most expensive months are June and December, where the average cost of tickets is £176 and £148 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Denver to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Denver to Ontario, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 49 days before departure.

Which airlines fly most frequently between Denver and Ontario?

Denver and Ontario are connected by different airlines. The airlines that fly that route the most regularly are United Airlines (4 flights per day), Southwest (3 flights per day), and Frontier (2 flights per day).

Which airlines fly direct between Denver and Ontario?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from Denver to Ontario.
There are 3 airlines that fly direct from Denver to Ontario. They are: Frontier, Southwest and United Airlines. The cheapest price of all airlines flying this route was found with Frontier at £92 for a one-way flight. On average, the best prices for this route can be found at Frontier.

How many flights are there between Denver and Ontario per day?

Each day, there are between 8 and 12 nonstop flights that take off from Denver and land in Ontario, with an average flight time of 2h 21m. The most common departure time is 19:00 and most flights take off in the evening. Each week, there are 76 flights. The most frequent day of departure is Friday, when 16% of all weekly flights depart. The fewest flights depart on a Saturday.

Which cabin class options are there for flights between Denver and Ontario?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There is only one cabin class option available for the route, which is Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

What’s the earliest departure time from Denver to Ontario?

Early birds can take the earliest flight from Denver at 05:01 and will be landing in Ontario at 06:26.

What’s the latest departure time from Denver to Ontario?

If you prefer to fly at night, the latest flight from Denver to Ontario jets off at 22:50 and lands at 00:05.

Good to know - Cheap tickets from Denver to Ontario

Low season

August

High season

March
Best time to beat the crowds (8% less expensive on average)
Most popular time to fly (2% more expensive on average)

When to book flights from Denver to Ontario

Are your dates flexible? Find out the best times to travel from Denver to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Denver to Ontario

  • Where can I find a taxi to travel aboard at ONT?

    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.

  • Does ONT have on-site restaurants?

    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.

  • Where is long-term parking at DEN?

    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.

  • Does DEN have a prayer room?

    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.

  • Which airlines offer Wi-Fi service onboard planes from Denver to Ontario?

    Delta, American Airlines, Alaska Airlines, and JetBlue offer inflight Wi-Fi service on the Denver to Ontario flight route.

  • Which aircraft models fly most regularly from Denver to Ontario?

    The Airbus A320-100/200 is the aircraft model that flies most regularly on the Denver to Ontario flight route.

  • Which airline alliances offer flights from Denver to Ontario?

    Star Alliance is the only airline alliance operating flights between Denver and Ontario.

  • On which days can I fly direct from Denver to Ontario?

    There are direct flights from Denver to Ontario on a daily basis.

  • How does KAYAK find such low prices on flights from Denver to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Denver to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Denver to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Denver is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Denver to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Ontario with an airline and back to Denver with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Denver to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding a cheap flight from Denver to Ontario

  • To have adequate time to go through Denver International Airport's (DEN) security checkpoints, you should reach the airport at least 2h ahead of your flight. Apart from going through the airport's checkpoints in time for your flight, if you reach the airport as early as advised, you'll get the chance to visit the airport's points of interest.
  • While waiting for your flight to Ontario International Airport (ONT) at DEN, you can relax at American Airlines Admirals Club, United Club, or Delta Sky Club. To enter any of these lounges, you must pay an entrance fee and show that you are traveling with the airline it is affiliated with. Delta Sky Club and American Airlines Admirals Club are found in Concourse A, while United Club has two locations in Concourse B.
  • In case you're traveling with a lactating baby, you can privately breastfeed him/her at DEN. This is because DEN features nursing rooms equipped with comfortable seating, sinks, power outlets, and privacy curtains near the center of Gates A, B, and C.
  • At ONT, you can easily withdraw the money you need before stepping out of the airport, as it features operational ATMs. These ATMs are on the upper and lower levels of Terminals 2 and 4, near the front entrance of the International Terminal, and in the airport's Rental Car Facility.
  • You should head to one of ONT's information desks if you have any inquiries. It's worth noting that you can count on getting fully answered at any of these desks in Terminals 2 and 4, as they feature well-informed airport staff.
See more tips

Prefer to fly direct from Denver to Ontario?

Find which airlines fly direct from Denver Intl to Ontario, which days they fly and book direct flights.

Direct departures

Denver Intl to Ontario

Monday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Tuesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Wednesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Thursday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Friday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Saturday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Sunday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

See more direct flights

Direct returns

Ontario to Denver Intl

Monday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Tuesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Wednesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Thursday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Friday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Saturday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Sunday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

See more direct flights
See more direct flights

Top airline flying from Denver to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Denver to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
6.2
FrontierOverall score based on 4108 reviews
5.8Comfort
5.2Food
7.1Crew
4.9Entertainment
6.6Boarding
Airline reviews

Left Denver late, then sat on tarmac 30 min after arrival

4.0 Okayleroy, Apr 2024DEN - SLC
Read more about Frontier reviews

Left Denver late, then sat on tarmac 30 min after arrival

Everything was good, 20/30 minutes late waiting on a crew member. It’s hard to keep employees. Or serious employees I know. I remember one flight from Houston of Frontiers was almost 18 hours late. And another 4 hours late very poor. But I would rather be late and safe than the on the news. Thank you.

Bought seats on the flight and they were supposed to be 2 and a jumpseat. Plane clearly changed and it was a regular 3 seat row. Asked for a refund and was denied. If I wanted to sit next to someone else I wouldn't have bought the seats..

Lost baggage on my connecting flight. 24 hours later, still no update on my bags.

It’s a cheap airline and I wish if they had better seats.

Seats are cramped and uncomfortable. You have to pay for everything and it is very expensive.

For a busy travel season, everything was clearly marked, correct, and smooth. My favorite travel description is “UNEVENTFUL,” and this trip met the mark!

The flight and crew were fine. When we (several groups) arrived in Norfolk on Sunday we discovered our bags had not arrived. The staff at norfolk airport was less than helpful. Told us our bags wouldn't arrive until Thursday. When asked what happened they said it bags never made it on the plane and it happened all the time. When asked about reimbursement for replacement items the desk agent said we could try to submit receipts online, but they weren't sure we would be reimbursed. I understand this is a low cost airline, but this was really beyond poor customer service.

Frontier is a no-frills airlines were the focus is low cost. You get basic service so don't set your expectations high. Watch out thought because this airline, like a few others, will try to nickel and dime you.

Flight had mayor delay. The onboarding took forever and was poorly conducted. AC was not in it was very warm in the plane.

Book cheap flights from Denver to Ontario

One-way flight deals

directAir Canada
2h 18mDEN-ONT
directFrontier
2h 25mDEN-ONT
directSouthwest
2h 15mDEN-ONT
directUnited Airlines
2h 25mDEN-ONT

Search by stops

Search by airline

Denver - Ontario Flights

Departure:

Denver (DEN)United States

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Denver

Cabin classes:

£467

Browse origins:

  • Flights » 
  • Denver

Browse destinations:

  • Flights » 
  • Worldwide » 
  • Ontario