Direct (nonstop) flights from Ontario to San Francisco
2 airlines fly nonstop from Ontario International Airport (ONT) to San Francisco International (SFO). It's 364 miles (585 km), about 1h 29m in the air. Operated by Frontier Airlines, United Airlines.
Frontier Airlines
United Airlines
Route data last updated: May 26, 2026
Airlines with non-stop flights
F9
Frontier Airlines
UA
United Airlines
Alternative Routes
Other ways to fly from Ontario to San Francisco with one stop · direct emits 67 kg CO₂ per passenger
Looking for the return flight?
SFO → ONT: Flights from San Francisco to OntarioOther direct flights from Ontario
Direct flights from San Francisco (SFO)
Frequently Asked Questions
How long is the direct flight from Ontario to San Francisco?
A nonstop flight from Ontario (ONT) to San Francisco (SFO) takes approximately 1 hours and 29 minutes. The distance is 364 miles (585 km).
Which airlines fly nonstop from Ontario to San Francisco?
2 airlines: Frontier Airlines, United Airlines.
Is there a nonstop flight from Ontario to San Francisco?
Yes. 2 airlines: Frontier Airlines, United Airlines.
How far is Ontario from San Francisco?
The flight distance from Ontario to San Francisco is 364 miles (585 km), measured as the great-circle (shortest air) distance. That's roughly the same distance as Mumbai to Goa.
What type of aircraft flies from Ontario to San Francisco?
At 1h 29m, this route typically uses narrow-body aircraft — Boeing 737 or Airbus A320. Varies by airline.
What is the carbon footprint of a flight from Ontario to San Francisco?
Roughly 67 kg CO2 per passenger one-way. That's about the same as driving 335 km.
Is the return flight from San Francisco to Ontario also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from Ontario to San Francisco?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. 3-6 weeks ahead is a good window for this route. Use "Check Prices" above to compare.
How early should I arrive at Ontario International Airport for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.