Cheapest return flights from Ontario (ONT) to San Francisco (SFO)

Cheapest month: December 2026, from $ 37. Book in one tap, or open a month for every date.

All destinations from Ontario (ONT)

One-wayReturn

  • November 2026

    12–16 Nov 4 nights
    $ 46 return
    Direct Frontier Airlines
    Price seen 11 Oct
    November dates

  • December 2026

    9–12 Dec 3 nights
    $ 37 return Cheapest month
    Direct Frontier Airlines
    Price seen 11 Oct
    December dates

  • January 2027

    29 Jan – 1 Feb 2027 3 nights
    $ 117 return
    Direct United
    Price seen 11 Oct
    January dates
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Updated Oct 12, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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