Cheap flights from Ontario to San Francisco from C$ 220

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to San Francisco . Millions of users trust and use momondo every year so you are in good hands.

Flights from Ontario to San Francisco with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to San Francisco from Ontario.

If you are not ready to book a flight from Ontario to San Francisco now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to San Francisco and let you know when they change.