Direct flights from Ontario to San Francisco ONT → SFO
Frontier Airlines and United Airlines operate nonstop flights from Ontario (ONT) to San Francisco (SFO). The nonstop flight takes around ~0h 44m, covering 364 miles (585 km). Updated 28 June 2026.
ONT
→
SFO
Round trip
1 adult
Economy
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Frontier Airlines
F9
United Airlines
UA
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Frequently asked questions
Is there a direct flight from Ontario to San Francisco?
Yes, Frontier Airlines and United Airlines operate nonstop flights from Ontario (ONT) to San Francisco (SFO).
Which airlines fly direct from Ontario to San Francisco?
Frontier Airlines, United Airlines operate nonstop flights from Ontario to San Francisco.
How long is the flight from Ontario to San Francisco?
The nonstop flight from Ontario to San Francisco takes ~0h 44m (approximately 585 km).