There are most likely no direct flights on the Ontario — San Francisco route
Flaut.Travel was designed and developed by a team dedicated to making the process of searching, comparing and booking airline tickets as easy and convenient as possible. Our service helps travelers to find and buy the cheapest flights from Ontario to San Francisco. We have connected more than 40 airlines and airline ticketing agencies to help you find the most suitable and affordable flight option.
A non-stop flight is the most convenient and comfortable way to fly from Ontario to San Francisco, despite the fact that sometimes flights with transfers can cost significantly less.
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Answers to questions about the route that travelers are most interested in.
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There are most likely no direct flights on the Ontario — San Francisco route
The minimum one-way ticket price from Ontario to San Francisco is $30 (June 2026), while the maximum is $152 (April 2027). On average, a ticket costs $49–$73.
Flight prices from Ontario to San Francisco are steadily rising: from June 2026 to April 2027, ticket costs increased by 401%. The sooner you book, the better the deal.
The most significant price increase was from June 2026 to August 2026 — up 61%. The best time to fly is June 2026–July 2026, when the average price is $31. In January 2027–April 2027, tickets cost around $141.
Given the rising prices, it's best not to delay your purchase. Flying in June 2026–July 2026 can save you up to 78% compared to the most expensive months.
Price variation across months on this route is 67.1%. Your choice of departure month significantly affects the total flight cost.
Ontario — San Francisco
07/01/2026
Departure
Direct flight
F92677
starting at $110
Ontario — San Francisco
06/09/2026
Departure
Direct flight
UA1375
starting at $432
Ontario — San Francisco
06/11/2026
Departure
Direct flight
UA2363
starting at $437
Ontario — San Francisco
06/15/2026
Departure
Direct flight
UA1375
starting at $335
Ontario — San Francisco
07/14/2026
Departure
Direct flight
F91159
starting at $104
starting at $28
starting at $138
The route Ontario — San Francisco is served by several airlines: Frontier Airlines and United Airlines. This gives passengers more freedom in choosing flights. You can consider not only the price but also schedules, baggage policies, and onboard service. Our service compares all offers so you can find tickets from $28 and choose the most convenient option. Thanks to airline competition, you may also find promotional fares or special offers, helping you save even more. Plan your trip in advance and choose the best flights without overpaying.
The cheapest flight ticket from Ontario to San Francisco according to data for the last 48 hours costs $28
Often the best time to buy tickets from Ontario to San Francisco is 2 months before departure.
Based on statistics over the past years, the lowest prices for flights from Ontario to San Francisco can be found flying in these months: June, July, September.
The fastest flights from Ontario to San Francisco start from 1 hour 25 minutes in the air.
The following airlines operate direct flights on the route Ontario — San Francisco: Frontier Airlines, United Airlines
The cheapest one-way flight from Ontario to San Francisco departs on 07/14/2026, is operated by Frontier Airlines and costs $28
There is no information about the cheapest roundtrip flight from Ontario to San Francisco
Fastest flight from Ontario to San Francisco takes 1h 25m
There are direct flights on this route 4 days a week: Mo, Tu, We, and Th
The distance between Ontario and San Francisco is 597km (370 miles). The average flight duration is 1h 29m. There are 7 direct flights from Ontario to San Francisco. Ontario and San Francisco are in the same time zone. Flights from Ontario begin at 6:00 AM. The latest flight from Ontario departs at 6:59 PM
We couldn't find any special offers for flights from Ontario to San Francisco