Cheapest return flights from Ontario to San Juan in April from $372

AirHint found the following cheapest return flights from Ontario (ONT) to San Juan (SJU) in April 2026 (see full year).

Return flights

02 Apr - 17 Apr United
07 Apr - 14 Apr Southwest Airlines
28 Apr - 04 May Southwest Airlines
17 Apr - 22 Apr Southwest Airlines
07 Apr - 13 Apr Southwest Airlines
30 Apr - 09 May Southwest Airlines
30 Apr - 03 May Southwest Airlines
13 Apr - 19 Apr Southwest Airlines
08 Apr - 15 Apr Southwest Airlines
09 Apr - 14 Apr Southwest Airlines
01 Apr - 15 Apr Southwest Airlines
09 Apr - 13 Apr Southwest Airlines
08 Apr - 13 Apr Southwest Airlines
29 Apr - 03 May Southwest Airlines

Also check the deals for one-way flights from Ontario to San Juan in April.

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