Cheap flights from Ontario to San Francisco
from 72 US$
From 52 USD — compare hundreds of airlines
The cheapest month is usually 2026-09 · 72 US$
See prices for my dates →Live fares from 100+ sites — free, with no hidden fees.
About this route
Compare flights from Ontario to San Francisco, a about 597 km route (around 1h 15m nonstop). We gather live prices from hundreds of airlines and agencies so you can find the cheapest and book on the official site, with no hidden fees. Direct flights are available. Airlines such as United Airlines operate this route.
When to buy and when to fly
Prices by date
Fares found by date — cheapest days in green.
How to get the best price
Airlines on this route
FAQ
What's the cheapest month to fly Ontario to San Francisco?
It's usually 2026-09, from 72 USD. Use the price calendar to compare other dates.
How long is the flight from Ontario to San Francisco?
A nonstop flight takes about 1h 15m and covers around 597 km. Connecting itineraries take longer.
Are there direct flights from Ontario to San Francisco?
Yes, this route has nonstop flights. Filter by "nonstop" to see them.
Which airlines fly from Ontario to San Francisco?
United Airlines operate this route, among others. Compare them all in the results.
When should I book Ontario–San Francisco flights?
As a rule of thumb, booking 3–8 weeks ahead and avoiding weekends and holidays tends to give the best prices. Use the calendar to spot the cheapest dates.
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Ontario → San Francisco · Live fares from 100+ sites — free, with no hidden fees.