There are most likely no direct flights on the San Francisco — Ontario route
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A non-stop flight is the most convenient and comfortable way to fly from San Francisco to Ontario, despite the fact that sometimes flights with transfers can cost significantly less.
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There are most likely no direct flights on the San Francisco — Ontario route
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Tickets from San Francisco to Ontario are getting more expensive each month. From October 2026 to June 2027, the increase reached 635%, with prices now at $235. It's unlikely to get cheaper than the current level.
The most significant price increase was from February 2027 to June 2027 — up 242%. The best time to fly is November 2026–December 2026, when the average price is $29. In May 2027–June 2027, tickets cost around $218.
Given the rising prices, it's best not to delay your purchase. Flying in November 2026–December 2026 can save you up to 87% compared to the most expensive months.
Price variation across months on this route is 66.7%. Your choice of departure month significantly affects the total flight cost.
The minimum one-way ticket price from San Francisco to Ontario is $21 (December 2026), while the maximum is $235 (June 2027). On average, a ticket costs $113–$241.
San Francisco — Ontario
11/16/2026
Departure
Direct flight
UA1482
starting at $119
San Francisco — Ontario
10/26/2026
Departure
Direct flight
UA1780
starting at $265
San Francisco — Ontario
10/31/2026
Departure
Direct flight
F91160
starting at $199
San Francisco — Ontario
12/08/2026
Departure
Direct flight
UA2062
starting at $58
San Francisco — Ontario
10/22/2026
Departure
Direct flight
UA5467
starting at $228
starting at $58
starting at $20
The route San Francisco — Ontario 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 $20 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 San Francisco to Ontario according to data for the last 48 hours costs $20
Often the best time to buy tickets from San Francisco to Ontario is 2 months before departure.
Based on statistics over the past years, the lowest prices for flights from San Francisco to Ontario can be found flying in these months: December, October, November.
The fastest flights from San Francisco to Ontario start from 1 hour 26 minutes in the air.
The following airlines operate direct flights on the route San Francisco — Ontario: United Airlines, Frontier Airlines
The cheapest one-way flight from San Francisco to Ontario departs on 12/09/2026, is operated by Frontier Airlines and costs $20
The cheapest roundtrip flight from San Francisco to Ontario departs on 11/17/2026, is operated by Frontier Airlines and costs $56
Fastest flight from San Francisco to Ontario takes 1h 26m
There are direct flights on this route 4 days a week: Mo, Tu, Th, and Sa
The distance between San Francisco and Ontario is 597km (370 miles). There are 33 direct flights from San Francisco to Ontario. San Francisco and Ontario are in the same time zone. Flights from San Francisco begin at 10:37 AM. The latest flight from San Francisco departs at 9:17 PM
We couldn't find any special offers for flights from San Francisco to Ontario