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

Return flights

21 Jul - 28 Jul	Southwest Airlines
23 Jul - 31 Jul	Southwest Airlines
22 Jul - 31 Jul	Southwest Airlines
17 Jul - 31 Jul	Southwest Airlines
23 Jul - 01 Aug	Southwest Airlines
22 Jul - 01 Aug	American Airlines
26 Jul - 03 Aug	Southwest Airlines
23 Jul - 02 Aug	Southwest Airlines

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

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 July from $402

Return flights