- Cheapest roundtrip flight
- from€266
- Fastest flight
- non-stop flights
- 44x / week
- Flight distance
- 1,317 km
- Time difference
- Most popular airlines
- United Airlines
- Frontier Airlines
- Southwest Airlines
- United Airlines
Cheap flight offers from Denver to Ontario
sorted by price and recency
- – –DEN–ONT1 stopover–ONT–DENnon-stop flight€266
- –
–DEN–ONT1 stopover–ONT–DEN1 stopover€548 - – –DEN–ONT1 stopover–ONT–DEN1 stopover€536
- – –DEN–ONTnon-stop flight–ONT–DENnon-stop flight€388
- – –DEN–ONT1 stopover–ONT–DEN1 stopover€3,022
- – –DEN–ONT1 stopover–ONT–DENnon-stop flight€275
Flight schedule from Denver (DEN) to Ontario (ONT)
Select a travel date in the flight schedule for the route from Denver (DEN) to Ontario (ONT) and compare affordable flight deals.
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Matching outbound flightsDEN–ONT · 18 of 18
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- November 1 – 7, 2026
- November 8 – 14, 2026
- November 15 – 21, 2026
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Important flight information
Frequently Asked Questions (FAQ)
How long is the flight from Denver to Ontario?
A nonstop flight from Denver to Ontario typically takes around 2 hours 25 minutes. If you choose a connecting flight, allow more travel time. Typical one-stop itineraries take around 5 hours 53 minutes. For the quickest trip, a nonstop flight is usually the most comfortable choice.
Are there nonstop flights from Denver to Ontario?
Yes, there are nonstop flights from Denver to Ontario, averaging around 6 to 7 flights per day, operated by, among others, Southwest, United Airlines and Frontier Airlines. If you want to fly without a layover, it is worth filtering specifically for nonstop flights when searching.
Which airlines fly from Denver to Ontario?
Direct flights from Denver to Ontario are operated by, among others, Southwest, United Airlines and Frontier Airlines. Connecting flights with one stop are also available, for example with American Airlines (via Phoenix - Sky Harbor). If travel time matters to you, a direct flight is usually the most convenient option. Connecting flights often give you more choice of departure times and airlines.
On which days are there nonstop flights from Denver to Ontario?
Nonstop flights from Denver to Ontario operate daily. The schedule may vary by season, so it is worth comparing several travel dates. If your preferred day does not have a nonstop flight, nearby departure days or short connecting flights may be a good alternative.
How many flights are there per day from Denver to Ontario?
From Denver to Ontario, there are on average around 6 to 7 flights per day. This usually means you have a good choice of departure times. If you are flexible, you can easily compare times, prices, and airlines.
How many flights per week are there from Denver to Ontario?
From Denver to Ontario, there are around 44 to 45 flights per week. This means you usually have connections available on several days and at various times. Beyond the price, it is worth comparing flight duration, airline, and any potential additional fees.
When does the first flight from Denver to Ontario depart?
The earliest nonstop flight from Denver to Ontario usually departs at 7:55 AM. The exact departure time may vary by day of the week and airline. Early flights are especially useful if you want to make the most of your arrival day in Ontario.
When does the last flight from Denver to Ontario depart?
The last nonstop flight from Denver to Ontario usually departs at 10:55 PM. Late flights can be convenient if you want to travel after work or in the evening. Do check whether it is a nonstop flight, as a connecting itinerary could push the arrival time significantly later.