Cheapest return flights from Ontario to San Juan in March from $402

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

Return flights

21 Mar - 26 Mar Southwest Airlines
31 Mar - 10 Apr Southwest Airlines
21 Mar - 29 Mar Southwest Airlines
01 Mar - 08 Mar Southwest Airlines
01 Mar - 15 Mar Southwest Airlines
08 Mar - 15 Mar Southwest Airlines
06 Mar - 10 Mar Southwest Airlines
15 Mar - 22 Mar Southwest Airlines
15 Mar - 29 Mar Southwest Airlines
22 Mar - 29 Mar Southwest Airlines
25 Mar - 30 Mar Southwest Airlines
22 Mar - 05 Apr Southwest Airlines
29 Mar - 05 Apr Southwest Airlines

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

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