● Deals from
● Sweeping every destination…
$78usually $88−11%1 Sept 2026 · direct · score 52/100 · Fair
Why so cheap?
This fare is below usual but under our auto-research threshold — ask and we’ll find the reason now, with sources.
Fares by departure date
Today’s fare is cheaper than 94% of the 17 fares tracked for this route.
Questions people ask about this route
- What is the lowest price for a flight from San Francisco to Ontario right now?
- The lowest price our scan found today (2026-08-29) is $78 one-way fare, departing 1 Sept 2026, direct. Fares move constantly — the link below re-checks live availability on Aviasales.
- Is $78 a good price for a San Francisco to Ontario flight (SFO→ONT)?
- Yes by the data: this route usually costs about $88 (midpoint of Google Flights' typical price range), so $78 is 11% below usual and cheaper than 94% of the 17 fares tracked for this route. FareFloor's deal score for it is 52/100 as of 2026-08-29.
- When is the cheapest time to fly from San Francisco to Ontario in the coming months?
- Across the departure windows our 2026-08-29 scan compared, the lowest-priced departure found is 1 Sept 2026 at $78 one-way fare. Method: we sweep this origin's destinations several times a day via Google Flights data and keep the cheapest round-trip window per route — a cheaper window can appear any day, so treat this as today's answer, not a permanent one.
- Is there a direct flight from San Francisco to Ontario at this price?
- Yes — the $78 fare found today is a direct flight.