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.
The minimum one-way ticket price from Ontario to San Francisco is $21 (December 2026), while the maximum is $230 (March 2027). On average, a ticket costs $91–$114.
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.
We keep tight track on airlines' pre-holidays sales and other special offers occurences all the time to let you save maximum amount of funds while traveling to your family or just going out on vacation.
Prices on the Ontario — San Francisco route are unpredictable: costs change from month to month with no clear pattern. Still, even here some periods are more affordable than others.
Despite the fluctuations, patterns exist: the cheapest period is November 2026–December 2026 — averaging $33. The most expensive is March 2027–June 2027 ($216). The difference reaches 85%.
With this kind of price behavior, it's worth comparing prices across several months and booking when a good deal appears. A good benchmark is November 2026–December 2026, where you can save up to 85%.
Price spread on this route is 88.7%. Costs vary significantly, so your choice of month can noticeably affect your travel budget.
There are most likely no direct flights on the Ontario — San Francisco route
All airports
Ontario — San Francisco
10/31/2026
Departure
Direct flight
UA2363
starting at $181
Ontario — San Francisco
11/12/2026
Departure
Direct flight
UA432
starting at $154
Ontario — San Francisco
11/06/2026
Departure
Direct flight
UA4699
starting at $235
starting at $154
starting at $47
The route Ontario — San Francisco is served by several airlines: United Airlines and Frontier 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 $47 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 $47
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: December, October, November.
The fastest flights from Ontario to San Francisco start from 1 hour 35 minutes in the air.
The following airlines operate direct flights on the route Ontario — San Francisco: United Airlines
The cheapest one-way flight from Ontario to San Francisco departs on 11/12/2026, is operated by Frontier Airlines and costs $47
The cheapest roundtrip flight from Ontario to San Francisco departs on 12/06/2026, is operated by Frontier Airlines and costs $32
Fastest flight from Ontario to San Francisco takes 1h 35m
There are direct flights on this route 3 days a week: Th, Fr, and Sa
The distance between Ontario and San Francisco is 597km (370 miles). There are 37 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 7:13 PM
We couldn't find any special offers for flights from Ontario to San Francisco