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

Return flights

01 Jul - 12 Jul	Frontier Airlines
10 Jul - 16 Jul	Frontier Airlines
08 Jul - 15 Jul	Frontier Airlines
11 Jul - 13 Jul	Frontier Airlines
15 Jul - 16 Jul	jetBlue
15 Jul - 26 Jul	Frontier Airlines
09 Jul - 17 Jul	Frontier Airlines
04 Jul - 07 Jul	Frontier Airlines
09 Jul - 19 Jul	Frontier Airlines
09 Jul - 18 Jul	Frontier Airlines
30 Jul - 06 Aug	Frontier Airlines
30 Jul - 03 Aug	Frontier Airlines
28 Jul - 03 Aug	Frontier Airlines
31 Jul - 03 Aug	Frontier Airlines

Also check the deals for one-way flights from San Francisco 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 San Francisco to San Juan in July from $258

Return flights