Cheap flights from Denver to Ontario (DEN - ONT)

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The best prices from Denver Intl to Ontario are usually found in August or May, booked 25 days in advance, depart on a Tuesday or Thursday and return on a Thursday

How to find the cheapest flight from
Denver (DEN) to Ontario (ONT)

All the information you need to plan the best DEN to ONT flight in 2021: compare Denver to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.
DEN - ONT
Price
$106 - $227
ONT
Temperature
53.6 - 78.8 °F
ONT
Precipitation
0.1 - 3.4 inches

Popular in

December

High demand for flights, 29% potential price rise

Cheapest in

August

Best time to find cheap flights, 35% potential price drop

Round-trip from

$106

From Denver Intl to Ontario

One-way from

$79

One-way flight from Denver Intl to Ontario

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
When is the cheapest time to fly from Denver to Ontario (DEN - ONT)?

One of the essential ways to save on airfare from Denver to Ontario is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 34% on airfare.

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

To save on the cost of your flight from Denver to Ontario, book at least 54 days before your planned departure. Booking around this time can save you about 9% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $138 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $151.

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

August is one of the best times of the year to fly to Ontario from Denver. Prices for August average $136 per person but you can even find prices for as low as $32. The most expensive prices can be found in the month of December. Opting for a August flight can save you 55% on your journey compared to booking in August

What is the cheapest day to fly round-trip from Denver to Ontario?

Monday is generally a great day to depart. Flying on this day could help you save up to 32%.

Cheap flights from Denver to Ontario in December, January 2022

The best prices found for DEN to ONT flights for December, January
10 Dec - 11 Dec
$54pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
6 Dec - 11 Dec
$63pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
10 Dec - 13 Dec
$64pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl

Denver Intl to Ontario 2022 flight deals

Cheap flights to Ontario from Denver found for this year
10 Dec - 11 Dec
$54pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
6 Dec - 11 Dec
$63pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
10 Dec - 13 Dec
$64pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl

Non-stop flights to Ontario from Denver

Save time with Denver to Ontario direct flight deals
4 Jan - 9 Jan
$71pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
14 Dec - 14 Dec
$72pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
14 Dec - 16 Dec
$81pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl

Last minute flights from Denver to Ontario

Late deals on round-trip flights to Ontario from Denver, departing today and this week
10 Dec - 11 Dec
$54pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
10 Dec - 14 Dec
$63pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
10 Dec - 13 Dec
$64pp
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl

One-way flights to Ontario from Denver

The cheapest one-way flights from Denver to Ontario
3:39 pm - 2:02 am
Multiple Airlines
1 Stop
11h 23m
DEN - ONT
Multiple Airlines
$79
Kiwi.com
3:59 am - 2:26 pm
American Airlines
2 Stops
11h 27m
DEN - ONT
American Airlines
10:50 am - 2:52 pm
United Airlines
1 Stop
5h 02m
DEN - ONT
United Airlines
$88
United

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Denver</span> to <span class="emphasized">Ontario</span> flights.

Flight FAQs

From Denver to Ontario

What airports do I use to fly from Denver to Ontario?

You will need to book a flight from Denver Intl to Ontario if you want to fly from Denver to Ontario. At least 7 different airlines have flights from Denver Intl (DEN) to Ontario (ONT) on a regular basis. There are 7 flights to Ontario from the Denver airport per day. If you manage to book one that is nonstop, then you can expect the flight time from DEN to ONT to be around 2h 18m.

Which airlines flying from Denver Intl to Ontario have flexible cancellations due to COVID-19?

Some of our airline partners flying from Denver Intl to Ontario have new flexible policies in place due to COVID-19. Frontier, United Airlines, and American Airlines are some of the carriers where you may find flexible cancellation policies. You can use our site to filter for airlines like Frontier with this kind of flexibility.

Can I find flights from Denver to Ontario for under $100 on Cheapflights?

Yes, there are multiple flights from Denver to Ontario for under $100. The cheapest flight booked recently is on Frontier for just $71, but on average you can expect to pay $91.

Are there nonstop flights from Denver to Ontario for under $100 on Cheapflights?

Cheapflights has at least 20 direct flights from Denver to Ontario under $100. A good price for a nonstop flight from Denver to Ontario is less than $106.

Are there last-minute flights available from Denver to Ontario for under $100?

There are currently 20+ open flights from Denver to Ontario within the next 7 days for less than $100.

What days are nonstop flights available from Denver to Ontario?

Days when nonstop flights are available for this flight are: Monday, Wednesday, Thursday, Saturday.

How popular is this Denver to Ontario flight route?

Flights from Denver Intl to Ontario have been viewed 201 times in the past calendar month.

How many flights depart from Denver to Ontario on average per day?

On average 4 flights depart from Denver to Ontario per day.
Morning (6am - Noon) - 25% of flight departures
Afternoon (Noon - 6pm) - 75% of flight departures

How long is the flight from Denver to Ontario?

There are many flights that can get you from Denver to Ontario in 2h 28m. Fly via Frontier to get the fastest option. Airlines will cover a distance of 822 mi. All flights are typically nonstop.

What is the cheapest airline to fly from Denver to Ontario round-trip?

According to our current data, Frontier ($71), offers the cheapest pricing from Denver to Ontario. Frontier is priced at 56% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from Denver to Ontario one-way?

For one-way options, check prices for Frontier. According to our data, you can fly for as low as $23. Users have also found prices from $64 and $80 on United Airlines and American Airlines, respectively.

What are the most reliable airlines from Denver to Ontario?

Before booking your flight to Ontario from Denver, check out the most reliable airlines to get you to your destination on time: Frontier (86%), United Airlines (78%), Air Canada( 77%).

What are the most popular airlines that fly from Denver to Ontario?

Consider Major Airline, American Airlines or Delta when booking your flight. These represent the most popular airlines when flying from Denver to Ontario.

What are the cheapest flights from Denver to Ontario?

The cheapest flight price from Denver to Ontario is $28. On average you can expect to pay $178. The most popular route, (Denver Intl - Ontario), can usually be booked for $88.

COVID Restrictions

View COVID Travel Restrictions for Ontario, CA

Do I need a COVID test to fly to Ontario from Denver?

Information is based on travel restrictions for travel to Ontario within the United States

Most visitors from Denver Intl need to provide a negative COVID-19 test result and/or quarantine to enter Ontario.

COVID-19 testing requirements
Visitors from Denver Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Ontario.

Quarantine requirements
Visitors from Denver Intl are not required to quarantine after entering Ontario.

Do I need a test to fly back to Denver from Ontario?

Returning to Denver Intl from Ontario

COVID-19 testing requirements
Visitors from Ontario must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Denver Intl.

Quarantine requirements
Visitors from Ontario are not required to quarantine after entering Denver Intl.

Hide COVID Travel Restrictions for Ontario, CA

Alternative routes for Denver to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for Ontario

Things to know before you go - useful duration and weather info for your trip from Denver to Ontario.
Flight duration from DEN to ONT
2h 23m

Airports servicing Denver

Airports servicing Ontario

Top 4 airlines flying from Denver Intl to Ontario

The chart below displays the airlines Cheapflights users traveling from Denver to Ontario choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Frontier
$63 $156 No cancel fee 62%
Delta
$67 $178 No cancel fee N/A
American Airlines
$88 $241 No cancel fee 71%
United Airlines
$98 $245 No cancel fee 69%

Hourly flight availability from Denver to Ontario

See what time of day planes typically take off from Denver towards Ontario.
Morning 6 AM to noon 47% of DEN to ONT departures
Evening 6 PM to midnight 36% of DEN to ONT departures
Afternoon Noon to 6 PM 9% of DEN to ONT departures
Early morning Midnight to 6 AM 8% of DEN to ONT departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Denver to Ontario
See how many times per day planes take to the skies headed from Denver to Ontario.
Sunday
4 daily flights
Monday
7 daily flights
Tuesday
7 daily flights
Wednesday
8 daily flights
Thursday
7 daily flights
Friday
9 daily flights
Saturday
10 daily flights
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