Cheap Flights from Denver to Ontario from $215 Roundtrip

Flight deals from Denver to Ontario

Looking for cheap flights from Denver to Ontario, or a last-minute trip? Find the lowest prices on one-way and round-trip flights right here.

Toronto.$215 per passenger.Departing Wed, Jan 7, returning Mon, Jan 12.Round-trip flight with Frontier Airlines and WestJet.Outbound indirect flight with Frontier Airlines, departing from Denver International on Wed, Jan 7, arriving in Toronto Island.Inbound indirect flight with WestJet, departing from Toronto Pearson International on Mon, Jan 12, arriving in Denver International.Price includes taxes and charges.From $215, select.

Ottawa.$340 per passenger.Departing Thu, Jan 15, returning Mon, Jan 19.Round-trip flight with Frontier Airlines and Porter Airlines.Outbound indirect flight with Frontier Airlines, departing from Denver International on Thu, Jan 15, arriving in Ottawa International.Inbound indirect flight with Porter Airlines, departing from Ottawa International on Mon, Jan 19, arriving in Denver International.Price includes taxes and charges.From $340, select.

London.$343 per passenger.Departing Wed, Jan 14, returning Wed, Jan 21.Round-trip flight with Frontier Airlines and WestJet.Outbound indirect flight with Frontier Airlines, departing from Denver International on Wed, Jan 14, arriving in London.Inbound indirect flight with WestJet, departing from London on Wed, Jan 21, arriving in Denver International.Price includes taxes and charges.From $343, select.

Toronto.$408 per passenger.Departing Wed, Dec 24, returning Wed, Dec 31.Round-trip flight with Air Canada.Outbound direct flight with Air Canada departing from Denver International on Wed, Dec 24, arriving in Toronto Pearson International.Inbound direct flight with Air Canada departing from Toronto Pearson International on Wed, Dec 31, arriving in Denver International.Price includes taxes and charges.From $408, select.

Windsor.$605 per passenger.Departing Sat, Dec 20, returning Fri, Jan 2.Round-trip flight with Frontier Airlines and Porter Airlines.Outbound indirect flight with Frontier Airlines, departing from Denver International on Sat, Dec 20, arriving in Windsor.Inbound indirect flight with Porter Airlines, departing from Windsor on Fri, Jan 2, arriving in Denver International.Price includes taxes and charges.From $605, select.

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Flying from Denver to Ontario

Arm yourself with these facts on the fly.

Cheapest flight found	$215
Cheapest month to fly	January
Average flight time	3 hrs, 14 mins
Cheapest airport to fly from	Denver International
Most popular airline	United

How to find cheap flights from Denver to Ontario

We've compared the best online travel agents and flight providers on the Internet to find the cheapest plane tickets from Denver to Ontario. Other savvy travelers recently found round-trip flights from $215 and one-way tickets from $89. Ready to join them? Here are a few tips to help you do it the smart way.

Fly from Denver International into Toronto Island

At the moment, the lowest-priced flight tickets to Ontario are from Denver International Airport to Toronto Island Airport.

Fly in January

We crunched the flight calendar and found the cheapest time to fly from Denver to Ontario is currently January.

Flex your dates for the best rates

If you’re flexible on your departure dates, you can use Skyscanner's whole month tool to find the cheapest day of the year to fly from Denver to anywhere you choose in Ontario.

Watch as flight prices go up and down

With Price Alerts, we'll let you know when flight prices from Denver to Ontario go up or down so you can book when the time is just right.

Relax – these are fee-free plane tickets

With us, there are no added fees – the Ontario to Ontario flight price you see when you search with us is what you pay to the provider.

Frequently asked questions

What's the average Denver to Ontario flight price?

We looked at all of the upcoming round-trip flights from Denver to Ontario we could find over the next 12 months. It looks like $215 is the best price. This is good, compared to the average Ontario ticket price of $382.

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

The cheapest month to fly from Denver to Windsor Airport is usually December. The cheapest month to fly from Denver to Ottawa International Airport is usually January. The cheapest month to fly from Denver to London Airport is usually January. And the cheapest month to fly from Denver to Toronto Pearson International Airport is usually December.

On which upcoming date is it cheapest to fly from Denver to Ontario?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Denver to Ontario on Wednesday, January 7, 2026.

Are there any direct flights from Denver to Ontario?

Denver International Airport offers direct flights to Ontario.

If I'm flying from Denver, where in Ontario is cheapest to fly to?

If you're flying from Denver, the cheapest city in Ontario to fly into is Toronto. The cheapest airport serving Toronto at the moment is Toronto Island.