S$173 Cheap Flights from Ontario to San Francisco

If you’re travelling between ONT and SFO, round-trip flights start from S$271. This price is based on airfares available within the last 7 days on Expedia for flights departing within the next year, so don’t wait around. Book now and save yourself money and time. Prices and availability are subject to change. Additional terms apply.

We get that things crop up unexpectedly, so we’ve made it as easy as possible for you to cancel your flight online. Just visit the Customer Service Portal and follow the instructions.

Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you’re searching for ONT to SFO flights, you’ll see a “no change fees” filter for you to select.

It’s only 590 kilometres between Ontario and San Francisco. It’s quite possible that you’ll spend more time getting to and from the airport than you will actually flying!

With 121 monthly flights from Ontario Airport to SFO, United Airlines (UA) is a top choice. Frontier Airlines (F9) is also worth checking out. It operates 21 flights per month. Between these two airlines, you’ll be able to find a good deal from Ontario to San Francisco.

Late planners can sometimes nab a bargain, with some of the cheapest fares from Ontario Airport to San Francisco Airport showing up a few weeks before the date of departure. If you’d rather book ahead of time, Expedia compares and updates all the best flight deals continually — as early as 12 months in advance in some cases. It does depend on the carrier though, as not all airlines issue prices so far in advance.