Cheap flights from Ontario to Denver (ONT - DEN)

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The best prices from Ontario to Denver are usually found in April or May, booked 18 days in advance, depart on a Thursday or Tuesday and return on a Tuesday

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

All the information you need to plan the best ONT to DEN flight in 2021: compare Ontario to Denver flight prices with the expected peak season, weather and rainfall in Denver.
ONT - DEN
Price
$126 - $238
DEN
Temperature
44.6 - 89.6 °F
DEN
Rainfall
0.5 - 2.7 inches

Popular in

December

High demand for flights, 34% potential price rise

Cheapest in

April

Best time to find cheap flights, 20% potential price drop

Round-trip from

$126

From Ontario to Denver

One-way from

$28

One-way flight from Ontario to Denver

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from Ontario to Denver?

Saturday flights are found to be more expensive to fly from Ontario to Denver. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Denver.

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

To save on the cost of your flight from Ontario to Denver, book at least 14 days before your planned departure. Booking around this time can save you about 12% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $88 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $106.

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

The best pricing can be found in the month of August. Prices to Denver from Ontario average $98. You can even find prices in August for less than $98, as users have found deals to Denver from as low as $36. The month of December appears to be one of the more expensive times to travel to Denver from Ontario. Flying in the targeted month can save you up to 38%.

When is the cheapest time to fly from Ontario to Denver (ONT - DEN)?

It’s typically best to fly out from Ontario to Denver in the evening. Doing so could potentially save you 40% on the flight price compared to flying at noon, which is usually more expensive.

Cheap flights from Ontario to Denver in June, July 2021

The best prices found for ONT to DEN flights for June, July
9 Jul - 12 Jul
$56pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
17 Jul - 20 Jul
$61pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
16 Jul - 1 Aug
$62pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario

Ontario to Denver 2021 flight deals

Cheap flights to Denver from Ontario found for this year
9 Jul - 12 Jul
$56pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
17 Jul - 20 Jul
$61pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
16 Jul - 1 Aug
$62pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario

Non-stop flights to Denver from Ontario

Save time with Ontario to Denver direct flight deals
9 Jul - 12 Jul
$56pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
17 Jul - 20 Jul
$61pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
16 Jul - 1 Aug
$62pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario

Last minute flights from Ontario to Denver

Late deals on round-trip flights to Denver from Ontario, departing today and this week
25 Jun - 29 Jun
$82pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
25 Jun - 28 Jun
$85pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
25 Jun - 27 Jun
$88pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario

One-way flights to Denver from Ontario

The cheapest one-way flights from Ontario to Denver
8:57 am - 12:17 pm
Frontier
Nonstop
2h 20m
ONT - DEN
Frontier
$28
JustFly
8:39 pm - 12:06 am
Frontier
Nonstop
2h 27m
ONT - DEN
Frontier
$32
CheapTickets.com
5:54 am - 9:09 am
Frontier
Nonstop
2h 15m
ONT - DEN
Frontier
$40
Kiwi.com

Related info for your journey

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

Flight FAQs

From Ontario to Denver

Are flight prices decreasing from Ontario to Denver due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Ontario and Denver for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

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

Some of our airline partners flying from Ontario to Denver Intl 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.

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

If you book a flight from Ontario to Denver, you will be flying from Ontario to Denver Intl. Flights to Denver Intl (DEN) from Ontario (ONT) take 2h 11m for a nonstop flight. There are 6 flights from Ontario to Denver per day from 7 airlines.

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

Yes, there are multiple flights from Ontario to Denver for under $100. The cheapest flight booked recently is on Frontier for just $56, but on average you can expect to pay $76.

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

Cheapflights has at least 20 direct flights from Ontario to Denver under $100. A good price for a nonstop flight from Ontario to Denver is less than $76.

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

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

What days are nonstop flights available from Ontario to Denver?

Nonstop flights are available for this route on the following days: Sunday, Monday, Wednesday, Thursday, Friday, Saturday.

How popular is this flight route?

This flight path from Ontario to Denver Intl was viewed by 816 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

Does it rain more in Ontario or Denver?

Expected rainfall in Ontario is more than in Denver. You can expect this to be the case over the next 2 days.

Is Ontario weather warmer or cooler than Denver?

Expect the weather to be around 95 °F on average in July. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Denver is generally colder than in Ontario.

How long is the flight from Ontario to Denver?

There are many flights that can get you from Ontario to Denver in 2h 15m. Fly via Frontier to get the fastest option. Most flights are nonstop.

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

According to our current data, Frontier ($56), offers the cheapest pricing from Ontario to Denver. Frontier is priced at 64% lower than the current average price of a flight leaving 3 months from now.

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

To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $28. Frontier is not the only option available. At the moment, Alaska Airlines is another option, for $84.

Alternative routes for Ontario to Denver

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

Destination information for Denver

Things to know before you go - useful duration and weather info for your trip from Ontario to Denver.
Flight duration
2h 21m
Average temperature for June in Denver
82.4 °F
Avg rainfall for June in Denver
1.8 ″

Airports servicing Ontario

Airports servicing Denver

Top 6 airlines flying from Ontario to Denver

The chart below displays the airlines Cheapflights users traveling from Ontario to Denver 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
$60 $158 No cancel fee 62%
Delta
$57 $159 No cancel fee N/A
Spirit Airlines
$125 $163 No cancel fee 65%
American Airlines
$82 $214 No cancel fee 71%
United Airlines
$98 $244 No cancel fee 69%
Southwest
$158 $330 No cancel fee 63%

Hourly flight availability from Ontario to Denver

See what time of day planes typically take off from Ontario towards Denver.
Afternoon Noon to 6 PM 64% of ONT to DEN departures
Early morning Midnight to 6 AM 18% of ONT to DEN departures
Morning 6 AM to noon 17% of ONT to DEN departures
Evening 6 PM to midnight 1% of ONT to DEN departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Ontario to Denver
See how many times per day planes take to the skies headed from Ontario to Denver.
Sunday
2 daily flights
Monday
7 daily flights
Tuesday
8 daily flights
Wednesday
9 daily flights
Thursday
6 daily flights
Friday
7 daily flights
Saturday
3 daily flights
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