Cheapest return flights from San Francisco to San Juan in October from $321

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

Return flights

17 Oct - 22 Oct Alaska Airlines
15 Oct - 18 Oct jetBlue
17 Oct - 21 Oct Frontier Airlines
24 Oct - 29 Oct Frontier Airlines
31 Oct - 03 Nov jetBlue
26 Oct - 02 Nov Frontier Airlines
02 Oct - 06 Oct Frontier Airlines
03 Oct - 06 Oct Frontier Airlines
02 Oct - 08 Oct Frontier Airlines
23 Oct - 27 Oct Frontier Airlines
15 Oct - 20 Oct jetBlue
02 Oct - 05 Oct Frontier Airlines

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

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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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