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

Return flights

01 Mar - 08 Mar	Southwest Airlines
01 Mar - 15 Mar	Southwest Airlines
08 Mar - 15 Mar	Southwest Airlines
28 Mar - 04 Apr	American Airlines
22 Mar - 29 Mar	Southwest Airlines
15 Mar - 22 Mar	Southwest Airlines
15 Mar - 29 Mar	Southwest Airlines
08 Mar - 22 Mar	Southwest Airlines
28 Mar - 03 Apr	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.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Ontario to San Juan in March from $540

Return flights