AirHint found the following cheapest return flights from Ontario (ONT) to San Juan (SJU) in July 2026 (see full year).
Return flights
| 15 Jul - 22 Jul | Southwest Airlines | ||
| 23 Jul - 27 Jul | jetBlue | ||
| 26 Jul - 03 Aug | jetBlue | ||
| 03 Jul - 07 Jul | jetBlue | ||
| 08 Jul - 15 Jul | United |
Also check the deals for one-way flights from Ontario to San Juan in July.
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