AirHint found the following cheapest return flights from Ontario (ONT) to San Juan (SJU) in June 2026 (see full year).
Return flights
| 22 Jun - 27 Jun | Southwest Airlines | ||
| 03 Jun - 08 Jun | Southwest Airlines | ||
| 18 Jun - 26 Jun | Southwest Airlines | ||
| 11 Jun - 21 Jun | Southwest Airlines |
Also check the deals for one-way flights from Ontario to San Juan in June.
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