Cheapest return flights from San Francisco to San Juan in September from $529

Best time to book flights for San Francisco (SFO) to San Juan (SJU) flights at AirHint

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

Return flights

18 Sep - 25 Sep Southwest 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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