Cheapest return flights from Ontario to San Juan in August from $470

AirHint found the following cheapest return flights from Ontario (ONT) to San Juan (SJU) in August 2025 (see full year).

Return flights

22 Aug - 26 Aug Frontier Airlines
21 Aug - 24 Aug Frontier Airlines
21 Aug - 26 Aug Frontier Airlines
22 Aug - 25 Aug Frontier Airlines
24 Aug - 31 Aug Frontier Airlines
21 Aug - 23 Aug Frontier Airlines
21 Aug - 25 Aug Frontier Airlines
22 Aug - 27 Aug Southwest Airlines
22 Aug - 28 Aug Southwest Airlines
25 Aug - 30 Aug Southwest Airlines
26 Aug - 03 Sep Southwest Airlines
27 Aug - 03 Sep Southwest Airlines
22 Aug - 02 Sep Southwest Airlines
26 Aug - 02 Sep Southwest Airlines
27 Aug - 02 Sep Southwest Airlines
28 Aug - 04 Sep Southwest Airlines
28 Aug - 02 Sep Southwest Airlines
30 Aug - 01 Sep Southwest Airlines
29 Aug - 01 Sep Southwest Airlines

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

Skyscanner

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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