Cheapest return flights from Ontario (ONT) to San Juan (SJU)

Cheapest month: November 2026, from $ 295. Book in one tap, or open a month for every date.

All destinations from Ontario (ONT)

One-wayReturn

  • November 2026

    11–17 Nov 6 nights
    $ 295 return Cheapest month
    Frontier Airlines
    Price seen 10 Oct
    November dates

  • December 2026

    31 Dec – 3 Jan 2027 3 nights
    $ 740 return
    Frontier Airlines
    Price seen 9 Oct
    December dates

  • July 2027

    11–22 Jul 2027 11 nights
    $ 554 return
    Southwest Airlines
    Price seen 9 Oct
    July dates
Powered by

Deals for one-way flights from Ontario to San Juan.

Book a cheap hotel in San Juan

Cheap car rent in Luis Munoz Marin Intl

Updated Oct 10, 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.

Feel free to contact us with any feedback or request another flight research.