Menu

Cheap flights from Ontario to Denver (ONT - DEN)

Know your dates, get live prices in seconds:

From
To
Depart
Return
Any month
Compare vs. Cheapflights |
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime
From
To
Depart
Depart
Time
Anytime

We work with more than 300 partners to bring you better travel deals

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)

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

$89

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 19 days before your planned departure. Booking around this time can save you about 22% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $248 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $318.

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 $257. You can even find prices in August for less than $257, as users have found deals to Denver from as low as $100. 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 50%.

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 afternoon. Doing so could potentially save you 42% on the flight price compared to flying at noon, which is usually more expensive.

Cheap flights from Ontario to Denver in December, January 2021

The best prices found for ONT to DEN flights for December, January
11 Dec - 12 Dec
$70pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
12 Dec - 20 Dec
$73pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
4 Dec - 7 Dec
$76pp
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
11 Dec - 12 Dec
$70pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
12 Dec - 20 Dec
$73pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
4 Dec - 7 Dec
$76pp
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
7 Jan - 11 Jan
$66pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
25 Feb - 28 Feb
$68pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
11 Dec - 12 Dec
$70pp
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
11 Dec - 12 Dec
$70pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
7 Dec - 14 Dec
$77pp
ONT
Ontario
Frontier
Non-Stop
DEN
Denver Intl
DEN
Denver Intl
Frontier
Non-Stop
ONT
Ontario
7 Dec - 11 Dec
$83pp
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
3:21 pm - 6:42 pm
Frontier
Nonstop
2h 21m
ONT - DEN
Frontier
$89
Travelgenio
6:31 am - 10:55 am
American Airlines
2 Stops
27h 24m
ONT - DEN
American Airlines
4:30 am - 2:39 pm
Alaska Airlines
2 Stops
9h 09m
ONT - DEN
Alaska Airlines

Related info for your journey

Useful info, stats and facts about Ontario to Denver 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.

What safety measures are being taken by airlines flying from Ontario to Denver Intl to control the spread of COVID-19?

Southwest and Delta are some of the many airlines that have implemented additional safety measures to control the spread of COVID-19. Some of the new policies that have been implemented to accommodate travelers flying from Ontario to Denver Intl are improved sanitation, HEPA filters, mask requirements, social distance seating (for a limited time), and pre-flight testing for antibodies and symptoms. Policies will vary by airline.

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 $66, but on average you can expect to pay $93.

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 $105.

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: Tuesday, 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.

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 Intl a day.
Morning (6am - Noon) - 100% of flight departures

Does it rain more in Ontario or Denver?

Expected rainfall in Ontario is same as in Denver. You can expect this to be the case over the next 7 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 10m. Fly via United Airlines, Frontier, or American Airlines to get the fastest option. Ontario and Denver are separated by a distance of 822 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

What are the cheapest airlines flying from Ontario to Denver round-trip?

According to our current data, Frontier ($66), United Airlines ($91), and American Airlines ($108) offers the cheapest pricing from Ontario to Denver. Frontier is priced at 58% 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 $37. United Airlines flights start at $49 while deals on American Airlines start at $54 one-way.

Alternative routes for Ontario to Denver

Destination information for Denver

Things to know before you go. Useful info for your trip from Ontario to Denver
Flight duration
2h 19m
Average temperature for December in Denver
44.6 °F
Avg rainfall for December in Denver
0.7 ″

Airports servicing Ontario

Airports servicing Denver

Top 6 airlines 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

Morning 6 AM to noon 48% of ONT to DEN departures
Early morning Midnight to 6 AM 30% of ONT to DEN departures
Afternoon Noon to 6 PM 22% 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
Sunday
6 daily flights
Monday
8 daily flights
Tuesday
7 daily flights
Wednesday
10 daily flights
Thursday
6 daily flights
Friday
7 daily flights
Saturday
2 daily flights
Home North America USA Colorado Denver Cheap flights from Ontario to Denver