Direct flights from Denver to Ontario DEN → ONT
Frontier Airlines, Southwest Airlines and United Airlines operate nonstop flights from Denver (DEN) to Ontario (ONT). The nonstop flight takes around ~1h 39m, covering 818 miles (1,316 km) and operates multiple daily. Updated 28 June 2026.
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Frontier Airlines
F9
Southwest Airlines
WN
United Airlines
UA
Departure Schedule next 7 days
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Frequently asked questions
Is there a direct flight from Denver to Ontario?
Yes, Frontier Airlines, Southwest Airlines and 1 more airline operate nonstop flights from Denver (DEN) to Ontario (ONT).
Which airlines fly direct from Denver to Ontario?
Frontier Airlines, Southwest Airlines, United Airlines operate nonstop flights from Denver to Ontario.
How long is the flight from Denver to Ontario?
The nonstop flight from Denver to Ontario takes ~1h 39m (approximately 1316 km).
How often do direct flights operate from Denver to Ontario?
Nonstop flights from Denver to Ontario operate multiple daily.