Cheap flights from Ontario to Denver (ONT - DEN)

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The best prices from Ontario to Denver Intl 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
30.2 - 73.4 °F
DEN
Precipitation
0.5 - 2.3 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 Intl

One-way from

$61

One-way flight from Ontario to Denver Intl

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

August can be a great time to fly to Denver from Ontario with a flight ticket averaging about $142. Cheapflights users have found deals in the month of August for as cheap as $32. The most expensive prices can be found in the month of December.

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

Users have found that booking a flight from Ontario to Denver at least 60 days early can save you up to 5% on average compared to booking a flight this week. If booking 60 days before your flight isn’t an option for you, users have found flights from Ontario to Denver for as little as $138 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $147 for flights departing within the next 3 days.

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

Leaving on a Wednesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 21% on the overall cost on flights from Ontario to Denver.

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 October, November 2021

The best prices found for ONT to DEN flights for October, November
3 Nov - 6 Nov
$49pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
11 Nov - 13 Nov
$54pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
11 Nov - 14 Nov
$61pp
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
3 Nov - 6 Nov
$49pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
11 Nov - 13 Nov
$54pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
11 Nov - 14 Nov
$61pp
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
3 Nov - 6 Nov
$49pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
11 Nov - 13 Nov
$54pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
3 Mar - 8 Mar
$59pp
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
28 Oct - 2 Nov
$54pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
27 Oct - 30 Oct
$66pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
28 Oct - 2 Nov
$71pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
 
1 STOP
ONT
Ontario

One-way flights to Denver Intl from Ontario

The cheapest one-way flights from Ontario to Denver
5:10 pm - 11:46 am
Multiple Airlines
1 Stop
17h 36m
ONT - DEN
Multiple Airlines
$61
Kiwi.com
2:36 pm - 7:30 pm
American Airlines
1 Stop
3h 54m
ONT - DEN
American Airlines
6:05 pm - 12:00 am
Frontier
1 Stop
4h 55m
ONT - DEN
Frontier
$78
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

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 14m for a nonstop flight. There are 9 flights from Ontario to Denver per day from 7 airlines.

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.

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 $49, but on average you can expect to pay $69.

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 $71.

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?

You can find nonstop flights on the following days: Monday, Saturday.

How popular is this Ontario to Denver flight route?

The Ontario to Denver Intl flight path was viewed by 209 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

On average, you can expect to see 2 flights from Ontario to Denver a day.
Morning (6am - Noon) - 50% of flight departures
Evening (6pm - Midnight) - 50% of flight departures

How long is the flight from Ontario to Denver?

For as low as $49, Frontier can have you in Denver from Ontario in 2h 21m. The distance between Ontario and Denver is about 822 mi. Most flights are nonstop.

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

Currently priced at $49, Frontier will fly you from Ontario to Denver and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. This flight start at 68% lower than the current average price 3 months from now.

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

For one-way options, check prices for Frontier. According to our data, you can fly for as low as $26. Users have also found prices from $59 and $76 on United Airlines and American Airlines, respectively.

What are the most reliable airlines from Ontario to Denver?

The top 3 most reliable airlines when flying from Ontario to Denver are United Airlines (91%), Air Canada (83%) and Frontier (81%).

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

The most popular airlines flying from Ontario to Denver are Major Airline, American Airlines and Delta. Something to consider prior to booking your flight.

What are the cheapest flights from Ontario to Denver?

While on average a flight from Ontario to Denver is generally $435, our data shows the cheapest flight currently is $43. When looking at the most popular route, (Ontario - Denver Intl), you can expect to pay $44 for that flight.

COVID Restrictions

View COVID Travel Restrictions for Denver, CO

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

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

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

COVID-19 testing requirements
Visitors from Ontario must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Denver Intl.

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

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

Returning to Ontario from Denver Intl

COVID-19 testing requirements
Visitors from Denver Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Ontario.

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

Hide COVID Travel Restrictions for Denver, CO

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 from ONT to DEN
2h 23m
Average temperature for October in Denver
66.2 °F
Avg rainfall for October in Denver
0.9 ″

Airports servicing Ontario

Airports servicing Denver

Top 6 airlines flying from Ontario to Denver Intl

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
Delta
$57 $159 No cancel fee N/A
Frontier
$60 $158 No cancel fee 62%
American Airlines
$82 $214 No cancel fee 71%
United Airlines
$98 $244 No cancel fee 69%
Spirit Airlines
$125 $163 No cancel fee 65%
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.
Early morning Midnight to 6 AM 50% of ONT to DEN departures
Morning 6 AM to noon 35% of ONT to DEN departures
Afternoon Noon to 6 PM 15% of ONT to DEN departures
Evening 6 PM to midnight 0% 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
10 daily flights
Monday
10 daily flights
Tuesday
7 daily flights
Wednesday
8 daily flights
Thursday
10 daily flights
Friday
12 daily flights
Saturday
8 daily flights
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