AirHint found the following cheapest return flights from Louisville (SDF) to San Juan (SJU) in July 2025 (see full year).

Return flights

27 Jul - 08 Aug	Spirit Airlines
21 Jul - 08 Aug	Spirit Airlines
21 Jul - 25 Jul	Southwest Airlines
13 Jul - 18 Jul	American Airlines
13 Jul - 25 Jul	Spirit Airlines
30 Jul - 09 Aug	American Airlines
27 Jul - 11 Aug	Spirit Airlines
21 Jul - 11 Aug	Spirit Airlines
21 Jul - 24 Jul	Spirit Airlines
13 Jul - 24 Jul	Spirit Airlines
30 Jul - 04 Aug	American Airlines

Also check the deals for one-way flights from Louisville 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 Louisville to San Juan in July from $323

Return flights