Cheapest return flights from San Francisco to San Juan in December from 251€

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

Return flights

30 Dec - 12 Jan Frontier Airlines
09 Dec - 15 Dec Frontier Airlines
11 Dec - 16 Dec Frontier Airlines
10 Dec - 14 Dec Frontier Airlines
13 Dec - 17 Dec Frontier Airlines
11 Dec - 15 Dec Frontier Airlines
06 Dec - 12 Dec Frontier Airlines
08 Dec - 11 Dec Frontier Airlines
07 Dec - 12 Dec Frontier Airlines
06 Dec - 09 Dec Frontier Airlines
13 Dec - 22 Dec Frontier Airlines
29 Dec - 06 Jan Frontier Airlines
22 Dec - 01 Jan Frontier Airlines
29 Dec - 04 Jan Frontier Airlines
25 Dec - 03 Jan Frontier Airlines
27 Dec - 02 Jan Frontier Airlines
26 Dec - 01 Jan Frontier Airlines
25 Dec - 02 Jan Frontier Airlines
20 Dec - 04 Jan Frontier Airlines
20 Dec - 03 Jan Frontier Airlines

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

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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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