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$28+ Cheap flights from Ontario to Denver (ONT - DEN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DEN
Sep 14 — Sep 211
From?
To?
Sat 9/14
Sat 9/21
1 adult, Economy
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Find cheap flights from Ontario to Denver with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
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3. Compare prices and book
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The best prices from Ontario to Denver Intl are usually found in January or September, booked 59 days in advance, depart on a Saturday or Wednesday and return on a Tuesday

Cheap flight deals from Ontario to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 9, 2024.

Popular in

March

Cheapest in

January

Round-trip from

$51
(Cheapflightsfares)

One-way from

$28
(Cheapflightsfares)
High demand for flights, 14% potential price rise
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Best time to find cheap flights, 14% potential price drop
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From Ontario to Denver Intl
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One-way flight from Ontario to Denver Intl
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Cheap Ontario to Denver flights in September & October 2024

Find cheap flight options from Ontario to Denver specifically for the months of September and October 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,868,638 searches. Prices were last updated on September 9, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to Denver in 2024. Check back in a little while for more flight options.
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/23:21 pmONT - DEN
Nonstop2h 20mFrontier
Wed 10/210:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$51
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/253:21 pmONT - DEN
Nonstop2h 20mFrontier
Wed 9/2510:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$53
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/126:31 pmONT - DEN
Nonstop2h 22mFrontier
Sat 10/1910:38 pmDEN - ONT
Nonstop2h 20mFrontier
Deal found 9/8$56
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2411:06 amONT - DEN
Nonstop2h 26mFrontier
Wed 10/210:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$57
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2411:06 amONT - DEN
Nonstop2h 26mFrontier
Wed 9/2510:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$58
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/306:30 amONT - DEN
Nonstop2h 22mFrontier
Sat 11/210:38 pmDEN - ONT
Nonstop2h 20mFrontier
Deal found 9/8$59
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/111:06 amONT - DEN
Nonstop2h 26mFrontier
Tue 10/88:45 amDEN - ONT
Nonstop2h 23mFrontier
Deal found 9/8$60
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/216:31 pmONT - DEN
Nonstop2h 25mFrontier
Wed 9/2510:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$61
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2411:06 amONT - DEN
Nonstop2h 26mFrontier
Fri 9/276:00 amDEN - ONT
Nonstop2h 22mFrontier
Deal found 9/8$62

Ontario to Denver 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Denver in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,868,638 searches. Data last updated September 9, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to Denver in 2024. Check back in a little while for more flight options.
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/23:21 pmONT - DEN
Nonstop2h 20mFrontier
Wed 10/210:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$51
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/253:21 pmONT - DEN
Nonstop2h 20mFrontier
Wed 9/2510:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$53
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/126:31 pmONT - DEN
Nonstop2h 22mFrontier
Sat 10/1910:38 pmDEN - ONT
Nonstop2h 20mFrontier
Deal found 9/8$56
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2411:06 amONT - DEN
Nonstop2h 26mFrontier
Wed 10/210:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$57
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2411:06 amONT - DEN
Nonstop2h 26mFrontier
Wed 9/2510:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$58
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/306:30 amONT - DEN
Nonstop2h 22mFrontier
Sat 11/210:38 pmDEN - ONT
Nonstop2h 20mFrontier
Deal found 9/8$59
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/111:06 amONT - DEN
Nonstop2h 26mFrontier
Tue 10/88:45 amDEN - ONT
Nonstop2h 23mFrontier
Deal found 9/8$60
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/216:31 pmONT - DEN
Nonstop2h 25mFrontier
Wed 9/2510:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$61
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2411:06 amONT - DEN
Nonstop2h 26mFrontier
Fri 9/276:00 amDEN - ONT
Nonstop2h 22mFrontier
Deal found 9/8$62

Ontario to Denver flights leaving soon

Find last-minute flight options from Ontario to Denver for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,868,638 searches. Data last updated September 9, 2024.
Check out these flights departing soon from Ontario to Denver. To prevent any unwanted surprises, users should verify their flight info before booking.
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1711:06 amONT - DEN
Nonstop2h 26mFrontier
Tue 9/248:45 amDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$80
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/186:30 amONT - DEN
Nonstop2h 25mFrontier
Fri 9/206:00 amDEN - ONT
Nonstop2h 22mFrontier
Deal found 9/8$84
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/176:30 amONT - DEN
Nonstop2h 25mFrontier
Fri 9/276:00 amDEN - ONT
Nonstop2h 22mFrontier
Deal found 9/8$85
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/146:31 pmONT - DEN
Nonstop2h 25mFrontier
Sat 9/216:00 amDEN - ONT
Nonstop2h 22mFrontier
Deal found 9/8$86
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/156:06 pmONT - DEN
Nonstop2h 25mFrontier
Wed 9/2510:38 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/8$90
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1711:06 amONT - DEN
Nonstop2h 26mFrontier
Sat 9/286:00 amDEN - ONT
Nonstop2h 22mFrontier
Deal found 9/8$91
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/196:30 amONT - DEN
Nonstop2h 25mFrontier
Mon 9/236:00 amDEN - ONT
Nonstop2h 22mFrontier
Deal found 9/8$93
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/156:30 amONT - DEN
Nonstop2h 25mFrontier
Mon 9/236:00 amDEN - ONT
Nonstop2h 22mFrontier
Deal found 9/8$94
This CheapOair deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1711:06 amONT - DEN
Nonstop2h 26mFrontier
Thu 9/196:00 amDEN - ONT
Nonstop2h 22mFrontier
Deal found 9/7$95

One-way flights to Denver from Ontario

Search for one-way flight options from Ontario to Denver. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,868,638 searches. Data last updated September 9, 2024.
Users traveling one-way from Ontario to Denver can select one of these great deals. Users in need of a round-trip flight from Ontario to Denver instead should update the search form at the top of page.
This Cheapflightsfares deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2411:06 amONT - DEN
Nonstop2h 26mFrontier
Deal found 9/9$28
This Frontier deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/612:49 amONT - DEN
Nonstop2h 21mFrontier
Deal found 9/7$29
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/216:31 pmONT - DEN
Nonstop2h 25mFrontier
Deal found 9/8$30
This Kiwi.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/51:32 pmONT - DEN
Nonstop2h 30mFrontier
Deal found 9/7$31
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/206:01 pmONT - DEN
Nonstop2h 25mFrontier
Deal found 9/8$33
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/226:30 amONT - DEN
Nonstop2h 25mFrontier
Deal found 9/8$34
This Kiwi.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/276:01 pmONT - DEN
Nonstop2h 25mFrontier
Deal found 9/7$36
This Frontier deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2211:08 amONT - DEN
Nonstop2h 24mFrontier
Deal found 9/9$39
This Cheapflightsfares deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/236:00 pmONT - DEN
Nonstop2h 25mFrontier
Deal found 9/8$40

Find flights from Ontario to Denver within your budget

Customize your flight search to find flights from Ontario to Denver that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,868,638 searches. Data last updated September 9, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$51 - $211

Route

Depart

Return

Price

OntarioDenver Intl

ONT - DEN

ONTDEN

Ontario

Wed 10/2

Nonstop2h 20m

Denver Intl

Wed 10/2

Nonstop2h 21m

$51

OntarioDenver Intl

ONT - DEN

ONTDEN

Ontario

Wed 9/25

Nonstop2h 20m

Denver Intl

Wed 9/25

Nonstop2h 21m

$53

OntarioDenver Intl

ONT - DEN

ONTDEN

Ontario

Sat 10/12

Nonstop2h 22m

Denver Intl

Sat 10/19

Nonstop2h 20m

$56

OntarioDenver Intl

ONT - DEN

ONTDEN

Ontario

Tue 9/24

Nonstop2h 26m

Denver Intl

Wed 10/2

Nonstop2h 21m

$57

OntarioDenver Intl

ONT - DEN

ONTDEN

Ontario

Tue 9/24

Nonstop2h 26m

Denver Intl

Wed 9/25

Nonstop2h 21m

$58

OntarioDenver Intl

ONT - DEN

ONTDEN

Ontario

Wed 10/30

Nonstop2h 22m

Denver Intl

Sat 11/2

Nonstop2h 20m

$59

OntarioDenver Intl

ONT - DEN

ONTDEN

Ontario

Tue 10/1

Nonstop2h 26m

Denver Intl

Tue 10/8

Nonstop2h 23m

$60

OntarioDenver Intl

ONT - DEN

ONTDEN

Ontario

Wed 12/11

Nonstop2h 21m

Denver Intl

Mon 12/16

1 stop7h 04m

$162

OntarioDenver Intl

ONT - DEN

ONTDEN

Ontario

Sat 10/5

1 stop4h 59m

Denver Intl

Tue 10/8

1 stop6h 17m

$211

Flights are sorted by cheapest first

Deals found on 9/8

Compare providers for flights from Ontario to Denver

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Denver in September.
ProviderPrice AccuracyTrust Score*Cancellation Policy
ExpediaPrice Accuracy1 starTrust Score*3 starsCancellation PolicyAirline Policy
eDreamsPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
FlightHubPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
CheapflightsfaresPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
CheapOairPrice Accuracy1 starTrust Score*3 starsCancellation PolicyAirline Policy
Kiwi.comPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyNo Information
PricelinePrice Accuracy2 starsTrust Score*3 starsCancellation PolicyAirline Policy
CheapfaremartPrice Accuracy0 starsTrust Score*3 starsCancellation PolicyAirline Policy
Justfly.comPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
Justfly.comPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Best time to book a flight from Ontario to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Ontario to Denver

Get recent, data-driven insights about flights from Ontario to Denver including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Denver. Price data was last updated on September 6, 2024.

The price you pay for your flight from Ontario to Denver may vary depending on when you book. For the best chance of a lower fare, look to book 41 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Find deals

What is the cheapest month to book a flight from Ontario to Denver?

Currently, December is the cheapest month in which you can book a flight from Ontario to Denver (average of $19). Flying from Ontario to Denver in February is currently the most expensive (average of $65). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to DEN?

Find hourly flight availability from Ontario to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 9, 2024.

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.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to Denver. Price data was last updated on September 8, 2024.

Travelers seeking maximum savings on their Ontario to Denver flight should consider departing on Saturday afternoons when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Find deals

Weekly flight availability from Ontario to Denver

Explore weekly flight availability from Ontario to Denver. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 9, 2024.

The most flights from ONT to DEN are scheduled on a Friday (16 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).

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

Our users search for these airlines the most when looking for flights from Ontario to Denver. Data last updated on September 9, 2024.

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

Frontier

Frontier

From $49

United Airlines

United Airlines

From $148

Delta

Delta

From $186

Southwest

Southwest

From $208

Rainfall in Denver by month

Plan your trip to Denver by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Denver ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Denver when rainfall is around 0.5 in.

Temperature in Denver by month

Plan your trip to Denver by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Denver, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Denver. Reviews last updated September 9, 2024.
To help decide which airline to fly from Ontario to Denver, see what other customers have to say about Frontier, Alaska Airlines and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
5,357 reviews

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.2
Very good
5,357 reviews
Southwest
8.2
Very good
5,357 reviews

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.0
Very good
9,351 reviews
Southwest
8.2
Very good
5,357 reviews

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
9,146 reviews
Southwest
8.2
Very good
5,357 reviews

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
9,599 reviews
Southwest
8.2
Very good
5,357 reviews

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

American Airlines
7.3
Good
10,000 reviews
Southwest
8.2
Very good
5,357 reviews

Comfort

8.1

Overall

8.2

Crew

8.7

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Related info for your journey

Find useful and relevant information for your journey from Ontario to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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 18m for a nonstop flight. There are 9 flights from Ontario to Denver per day from 5 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 $51, but on average you can expect to pay $63.

  • 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 $63.

  • 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.

  • How popular is this Ontario to Denver flight route?

    The Ontario to Denver Intl flight path was viewed by 345 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.
    Early Morning (Midnight to 6am) - 50% of flight departures
    Morning (6am - Noon) - 50% of flight departures

  • How long is the flight from Ontario to Denver?

    For as low as $51, Frontier can have you in Denver from Ontario in 2h 20m. 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 $51, 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 65% lower than the current average price 3 months from now.

  • What are the most reliable airlines from Ontario to Denver?

    The top 3 most reliable airlines when flying from Ontario to Denver are Southwest (89%), United Airli