Cheapest return flights from San Francisco to San Juan in September from $263

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

Return flights

13 Sep - 19 Sep Frontier Airlines
13 Sep - 26 Sep Frontier Airlines
19 Sep - 26 Sep Frontier Airlines
26 Sep - 04 Oct Frontier Airlines
19 Sep - 22 Sep Frontier Airlines
16 Sep - 23 Sep jetBlue
22 Sep - 30 Sep jetBlue
20 Sep - 27 Sep Frontier Airlines
26 Sep - 29 Sep Frontier Airlines
16 Sep - 27 Sep jetBlue
17 Sep - 26 Sep Frontier Airlines
17 Sep - 01 Oct Frontier Airlines

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

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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