AirHint found the following cheapest return flights from Nashville (BNA) to San Juan (SJU) in September 2025 (see full year).

Return flights

22 Sep - 26 Sep	Southwest Airlines
18 Sep - 22 Sep	Southwest Airlines
17 Sep - 22 Sep	Southwest Airlines
26 Sep - 29 Sep	Southwest Airlines
07 Sep - 18 Sep	Spirit Airlines
07 Sep - 22 Sep	Spirit Airlines
07 Sep - 20 Sep	Spirit Airlines
05 Sep - 18 Sep	Spirit Airlines
18 Sep - 20 Sep	Spirit Airlines
07 Sep - 10 Sep	Spirit Airlines
22 Sep - 13 Oct	Spirit Airlines

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

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 Nashville to San Juan in September from $193

Return flights