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.
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.
There are most likely no direct flights on the Ontario — San Francisco route
Ontario — Oakland
09/30/2026
Departure
Direct flight
WN690
starting at $155
Ontario — San Francisco
09/09/2026
Departure
Direct flight
UA1375
starting at $188
Ontario — San Francisco
09/10/2026
Departure
Direct flight
UA2363
starting at $126
Ontario — San Francisco
09/14/2026
Departure
Direct flight
UA1375
starting at $130
Ontario — San Francisco
09/15/2026
Departure
Direct flight
UA1601
starting at $187
Ontario — San Francisco
09/18/2026
Departure
Direct flight
UA1665
starting at $124
Ontario — San Francisco
09/11/2026
Departure
Direct flight
F91159
starting at $31
Ontario — San Francisco
09/12/2026
Departure
Direct flight
UA1375
starting at $132
Ontario — San Francisco
09/14/2026
Departure
Direct flight
UA1665
starting at $128
The route Ontario — San Francisco is served by several airlines: Southwest 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 $31 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 one-way flight from Ontario to San Francisco departs on 09/17/2026, is operated by Frontier Airlines and costs $31
The cheapest roundtrip flight from Ontario to San Francisco departs on 12/22/2026, is operated by Frontier Airlines and costs $147
Fastest flight from Ontario to San Francisco takes 1h 27m
There are direct flights on this route 6 days a week: Mo, Tu, We, 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
The cheapest flight ticket from Ontario to San Francisco according to data for the last 48 hours costs $31
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: November, October, September.
The fastest flights from Ontario to San Francisco start from 1 hour 27 minutes in the air.
The following airlines operate direct flights on the route Ontario — San Francisco: Southwest Airlines, United Airlines, Frontier Airlines
The minimum one-way ticket price from Ontario to San Francisco is $24 (November 2026), while the maximum is $209 (April 2027). On average, a ticket costs $125–$333.
On the Ontario — San Francisco route, prices first decline, hit a low, then start rising again. The middle of the period creates a price window — the best time to book.
Prices fall from August 2026 to November 2026 (88%), then rise from November 2026 to April 2027 (+766%). The best period is October 2026–November 2026 ($24), the most expensive is June 2027–July 2027 ($193).
The best time to buy is October 2026–November 2026, when prices are at their lowest. This can save you up to 87% compared to the expensive months (June 2027–July 2027).
Monthly price variation is 58.3%. On this route, your departure date noticeably affects the cost, and choosing wisely can lead to real savings.
