Flights from Denver to Ontario
Nonstop flights from Denver (DEN) to Ontario (ONT) take about 2h 9m (1,316 km). Frontier Airlines flies it. Lowest fare seen: $63 one-way, nonstop (22 Oct 2026).
When you land in Ontario
The airport transfer and the few things worth sorting before you fly.
Getting out of Ontario (ONT)
Skip the taxi rank and lock in your fare before you land.
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Airlines flying Denver to Ontario
Carriers on DEN–ONT according to our route data and nonstop fares seen as of 22 Oct 2026. Not a complete list.
Denver to Ontario fares by month
Cheapest month seen for a nonstop flight: Nov 2026, from $53 one-way. Lowest one-way fares seen for departures in each month, read 22 Oct 2026.
| Departing | Nonstop from | Cheaper with stops |
|---|---|---|
| Oct 2026 | $23830 Oct 2026 · Frontier Airlines | $173 · 1 stop30 Oct 2026 · Frontier Airlines |
| Nov 2026 | $5310 Nov 2026 · Frontier Airlines | — |
| Dec 2026 | $6316 Dec 2026 · Frontier Airlines | — |
| Mar 2027 | $28324 Mar 2027 · Southwest Airlines | $273 · 1 stop24 Mar 2027 |
| Jun 2027 | $3279 Jun 2027 · United Airlines | $290 · 1 stop9 Jun 2027 |
When to go for the lowest fare
The next few weeks were the cheapest to fly: from $53 in November 2026, against $63 at best later on.
Nonstop or with a stop
A connection undercut nonstop in 3 of 3 months with both fares.
From Travelpayouts flight-search data, city to city (Denver to Ontario, any airport), USD, read 22 Oct 2026. These are fares that were on sale, not a guarantee of today's price; an airline is named only where we know it flies this route.
More for this trip
Frequently asked questions — Denver to Ontario flights
How long is the flight from Denver to Ontario?
How far is Denver from Ontario by air?
Which airlines fly from Denver to Ontario?
How much does a flight from Denver to Ontario cost?
What is the cheapest month to fly from Denver to Ontario?
Do I need a visa to travel from Denver to Ontario?
Sources: fares from Travelpayouts flight-search data, seen 22 Oct 2026; airlines from each carrier's published network and nonstop fares on sale; distance from OurAirports coordinates; flight time estimated from distance. Fares change daily.
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