Cheapest return flights from Ontario to San Juan in September from 478€

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

Return flights

03 Sep - 07 Sep Southwest Airlines
03 Sep - 08 Sep Southwest Airlines
30 Sep - 06 Oct Southwest Airlines

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

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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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