Cheap flights from Ontario to San Francisco
Live cached fares for this route are being gathered — run a full search for real-time prices.
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Frequently asked questions
Which airlines fly from Ontario to San Francisco?
ScanFlyGo compares fares on this route from 1,200+ airlines and travel agencies.
What is the cheapest day to fly from Ontario to San Francisco?
ScanFlyGo shows the cheapest fare for each day of October 2026 — check the price table above to pick the cheapest date, then book directly with the provider.
Is Ontario to San Francisco a direct flight?
Both direct and connecting options may be available. Use the ScanFlyGo search to filter by stops, airline and time.
Can I track my Ontario to San Francisco flight live?
Yes. ScanFlyGo has a built-in live flight tracker with a real-time map, so you can follow your aircraft on the day by flight number.
Does ScanFlyGo charge booking or service fees?
No. ScanFlyGo is a free flight metasearch — we compare fares and send you to the airline or agency to book. The price is confirmed at their checkout with no extra fee from us.
About Ontario to San Francisco flights
ScanFlyGo compares Ontario (Ontario International Airport, ONT) to San Francisco (San Francisco International Airport, SFO) fares across 1,200+ airlines and agencies via the Aviasales network. Prices shown are the lowest cached market fares; the final price is always confirmed at the partner's checkout. You can also search the return route San Francisco → Ontario, or use the full live search for exact dates, stops, airline filters and a live map to track your flight on the day.
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