Cheap Flight Tickets from Denver (DEN) to Ontario (ONT)

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Latest Flight Deals from Denver to Ontario

Book one-way or return flights from Denver to Ontario from as little as AU$ 24. Choose from the popular airlines below and book your flight today!

One way
Return

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Searching for the best last minute flight from Denver to Ontario? Find one-way or return flights that are affordable and fit your itinerary.

Trip.com monitors the ticket fares of flights from Denver to Ontario. Stay updated on price trends and snag the best deals for your upcoming trip.

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Airlines Flying from Denver to Ontario

View airlines operating flights from Denver to Ontario. Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines

From AU$ 24

Southwest Airlines

From AU$ 120

Delta Air Lines

From AU$ 123

United Airlines

From AU$ 140

Alaska Airlines

From AU$ 143

American Airlines

From AU$ 302

ANA airlines

Find more flights and airlines

Alternative Routes from Denver to Ontario

Discover different routes, airlines, and transfers and find the best alternative flights for your journey from Denver to Ontario.

Cheapest
DEN
05:01
2h 25m
Direct
ONT
06:26
Denver International Airport - Ontario International Airport
Mon, May 6Frontier Airlines
AU$ 24
DEN
05:01
2h 25m
Direct
ONT
06:26
Denver International Airport - Ontario International Airport
Mon, May 6Frontier Airlines
AU$ 24
Find More Flights

How do I find the cheapest flights?

When are flight from Denver (DEN) to Ontario (ONT) the cheapest?
Airlines adjust prices for flights from Denver to Ontario based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much are flights from Denver (DEN) to Ontario (ONT) cost?
According to Trip.com's data, the lowest price is around AU$ 285.
What's the most popular airline for direct flights from Denver (DEN) to Ontario (ONT)?
Delta Air Lines operates 1 direct flights from Denver (DEN) to Ontario (ONT).

How to find a cheap flight from Denver to Ontario

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Denver to Ontario. Book your flights at the right time and save more.

Book Early

Once prices are gone, they're gone. Lock in deals while you can!

Compare Flight Prices

Compare prices on travel agency and airline websites.

Look Out for Deals

Check airline and travel agency websites for latest flight deals

Check One-way Fares

Buying two cheap one-way flights can sometimes be a better deal than a round-trip.

Try Different Dates

Flying during the week, early in the morning, or late at night can help save money.

Use the Trip.com App

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Flight Information from Denver to Ontario

Cheapest direct flight price	AU$ 24
Cheapest return ticket price	AU$ 54
Off-season for travel	February
Peak season for travel	February
Flight distance	11,253.64km
Popular airline	United Airlines