Cheapest return flights from Los Angeles to San Juan in September from $274

Best time to book flights for Los Angeles (LAX) to San Juan (SJU) flights at AirHint

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

Return flights

04 Sep - 08 Sep Frontier Airlines
11 Sep - 14 Sep Frontier Airlines
13 Sep - 15 Sep Frontier Airlines
26 Sep - 05 Oct Frontier Airlines
12 Sep - 14 Sep Frontier Airlines
26 Sep - 06 Oct Frontier Airlines
06 Sep - 11 Sep Frontier Airlines
16 Sep - 29 Sep jetBlue
14 Sep - 30 Sep Frontier Airlines
02 Sep - 07 Sep jetBlue
02 Sep - 08 Sep jetBlue
03 Sep - 08 Sep Spirit Airlines

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

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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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