Cheap Flights from Denver to Ontario

Cheapest flights from Denver to Ontario

Flaut.Travel was designed and developed by a team dedicated to making the process of searching, comparing and booking airline tickets as easy and convenient as possible. Our service helps travelers to find and buy the cheapest flights from Denver to Ontario. We have connected more than 40 airlines and airline ticketing agencies to help you find the most suitable and affordable flight option.

Cheapest one way flight

$30

Frontier Airlines

Direct flight

2h 27m

12/13/2025

The cheapest one-way flight from Denver to Ontario departs on 12/13/2025, is operated by Frontier Airlines and costs $30

Cheapest round trip flight

—

There is no information about the cheapest roundtrip flight from Denver to Ontario

The fastest flight

2h 27m

Fastest flight from Denver to Ontario takes 2h 27m

Direct flights

Several times a week

There are direct flights on this route 4 days a week: Su, We, Fr, and Sa

Earliest flight

7:55 AM

Latest flight

10:40 PM

Direct flights count

63

Distance

1289km

Timezone difference

1h

The distance between Denver and Ontario is 1289km (799 miles). There are 63 direct flights from Denver to Ontario. The time difference between Denver and Ontario is 1h. Flights from Denver begin at 7:55 AM. The latest flight from Denver departs at 10:40 PM

Remember that on average the ideal time to book flights is 2 months before departure!

Airfare from Denver to Ontario by month

The cost of a one-way flight from Denver to Ontario ranges from $49 (December 2025) to $169 (October 2025). On average, the ticket price is about $105–$265.

December 2025

Lowest price

on average:

$49

October 2025

Highest price

on average:

$169

Avg Price

Airlines operating on route

Flights from Denver to Ontario are operated by several airlines — United Airlines and Frontier Airlines. This allows passengers to flexibly choose flights based on departure time, cost, and additional services. The minimum ticket price starts at $30, making this destination accessible to travelers with different budgets. We help compare all available options in real time, so you can book tickets at the best value for money. The service ensures transparent search and lets you book affordable flights in just a few clicks.

United Airlines

Starting at $215

Frontier Airlines

Starting at $30

Direct Flights from Denver to Ontario

A direct flight is the most convenient and comfortable way to fly from Denver to Ontario, despite the fact that sometimes flights with transfers can cost significantly less.

Denver — Los Angeles

DEN — LAX

12/13/2025

Departure

Direct flight

UA1320

Starting at $215

Denver — Los Angeles

DEN — LAX

01/03/2026

Departure

Direct flight

UA557

Starting at $301

Denver — Los Angeles

DEN — LAX

10/24/2026

Departure

Direct flight

UA1638

Starting at $713

Denver — Los Angeles

DEN — LAX

12/06/2025

Departure

Direct flight

UA742

Starting at $248

Denver — Los Angeles

DEN — LAX

12/09/2025

Departure

Direct flight

UA2154

Starting at $239

Denver — Los Angeles

DEN — LAX

02/21/2026

Departure

Direct flight

F92341

Starting at $129

Schedule of direct flights from Denver to Ontario

A direct flight is the easiest way to get to your destination. The following airlines operate non-stop flights from Denver to Ontario:

Unable to find information about the schedule of direct flights from

Denver airports overview

Centennial Airport

•

APA

1km

Denver International Airport

•

DEN

30km

•

Ontario airports overview

Ontario International Airport

•

ONT

5km

Serves Ontario and the Inland Empire region of Southern California, offering domestic and select international flights; convenient for travelers to Los Angeles, San Bernardino and nearby business centers.

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Frequently asked questions (FAQ)

Answers to questions about the route that travelers are most interested in.

How much is the cheapest flight ticket from Denver to Ontario?

The cheapest flight ticket from Denver to Ontario according to data for the last 48 hours costs $30

When is the best time to buy air tickets on the route Denver — Ontario?

Often the best time to buy tickets from Denver to Ontario is 2 months before departure.

When is the cheapest time of year to fly from Denver to Ontario?

Based on statistics over the past years, the lowest prices for flights from Denver to Ontario can be found flying in these months: December, November, October.

How long does it take to fly from Denver to Ontario?

The fastest flights from Denver to Ontario start from 2 hours 27 minutes in the air.

Which airline can fly direct from Denver to Ontario?

The following airlines operate direct flights on the route Denver — Ontario: United Airlines, Frontier Airlines

Special offers and sales on air tickets from Denver to Ontario

We keep tight track on airlines' pre-holidays sales and other special offers occurences all the time to let you save maximum amount of funds while traveling to your family or just going out on vacation.

We couldn't find any special offers for flights from Denver to Ontario

Alternative routes

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Cheapest one way flight

$30

Frontier Airlines

Direct flight

2h 27m

12/13/2025

The cheapest one-way flight from Denver to Ontario departs on 12/13/2025, is operated by Frontier Airlines and costs $30

Cheapest round trip flight

—

There is no information about the cheapest roundtrip flight from Denver to Ontario

The fastest flight