AirHint found the following cheapest return flights from Ontario (ONT) to San Juan (SJU) in April 2026 (see full year).
Return flights
| 26 Apr - 01 May | Southwest Airlines | ||
| 24 Apr - 28 Apr | Southwest Airlines | ||
| 14 Apr - 19 Apr | Southwest Airlines | ||
| 06 Apr - 11 Apr | Southwest Airlines |
Also check the deals for one-way flights from Ontario to San Juan in April.
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