Direct (nonstop) flights from San Francisco to Ontario
2 airlines fly nonstop from San Francisco International (SFO) to Ontario International Airport (ONT). It's 364 miles (585 km), about 1h 33m in the air. Operated by Frontier Airlines, United Airlines.
Frontier Airlines
United Airlines
Route data last updated: May 28, 2026
Airlines with non-stop flights
F9
Frontier Airlines
UA
United Airlines
Alternative Routes
Other ways to fly from San Francisco to Ontario with one stop · direct emits 67 kg CO₂ per passenger
Looking for the return flight?
ONT → SFO: Flights from Ontario to San FranciscoOther direct flights from San Francisco
Direct flights from Ontario (ONT)
Frequently Asked Questions
How long is the direct flight from San Francisco to Ontario?
A nonstop flight from San Francisco (SFO) to Ontario (ONT) takes approximately 1 hours and 33 minutes. The distance is 364 miles (585 km).
Which airlines fly nonstop from San Francisco to Ontario?
2 airlines: Frontier Airlines, United Airlines.
Is there a nonstop flight from San Francisco to Ontario?
Yes. 2 airlines: Frontier Airlines, United Airlines.
How far is San Francisco from Ontario?
The flight distance from San Francisco to Ontario 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 San Francisco to Ontario?
At 1h 33m, this route typically uses narrow-body aircraft — Boeing 737 or Airbus A320. Varies by airline.
What is the carbon footprint of a flight from San Francisco to Ontario?
Roughly 67 kg CO2 per passenger one-way. That's about the same as driving 335 km.
Is the return flight from Ontario to San Francisco 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 San Francisco to Ontario?
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 San Francisco International for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.