Cheap flights from San Francisco to Ontario
from 28 US$
From 112 USD — compare hundreds of airlines
The cheapest month is usually 2026-09 · 28 US$
See prices for my dates →Live fares from 100+ sites — free, with no hidden fees.
About this route
Compare flights from San Francisco to Ontario, 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 San Francisco to Ontario?
It's usually 2026-09, from 28 USD. Use the price calendar to compare other dates.
How long is the flight from San Francisco to Ontario?
A nonstop flight takes about 1h 15m and covers around 597 km. Connecting itineraries take longer.
Are there direct flights from San Francisco to Ontario?
Yes, this route has nonstop flights. Filter by "nonstop" to see them.
Which airlines fly from San Francisco to Ontario?
United Airlines operate this route, among others. Compare them all in the results.
When should I book San Francisco–Ontario 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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San Francisco → Ontario · Live fares from 100+ sites — free, with no hidden fees.