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

Return flights

11 Aug - 14 Aug	Delta
11 Aug - 14 Aug	Frontier Airlines	direct
02 Aug - 07 Aug	Frontier Airlines
04 Aug - 22 Aug	Frontier Airlines
22 Aug - 27 Aug	Southwest Airlines
02 Aug - 11 Aug	Frontier Airlines
04 Aug - 06 Aug	United
01 Aug - 03 Aug	Frontier Airlines
01 Aug - 06 Aug	Southwest Airlines
02 Aug - 04 Aug	Frontier Airlines
30 Aug - 02 Sep	Delta

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

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 Jacksonville to San Juan in August from 149€

Return flights