Cheapest return flights from San Francisco to San Juan in December from $324

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

Return flights

05 Dec - 13 Dec Frontier Airlines
04 Dec - 09 Dec American Airlines
10 Dec - 17 Dec Frontier Airlines
03 Dec - 13 Dec American Airlines
13 Dec - 20 Dec Frontier Airlines
05 Dec - 07 Dec American Airlines
13 Dec - 18 Dec United
28 Dec - 31 Dec Frontier Airlines
24 Dec - 12 Jan Frontier Airlines
10 Dec - 14 Dec Southwest Airlines
04 Dec - 14 Dec Frontier Airlines
22 Dec - 07 Jan Frontier Airlines
20 Dec - 06 Jan Frontier Airlines
22 Dec - 01 Jan Frontier Airlines
25 Dec - 05 Jan Frontier Airlines
25 Dec - 01 Jan Frontier Airlines
20 Dec - 01 Jan Frontier Airlines
21 Dec - 01 Jan Frontier Airlines
25 Dec - 04 Jan Frontier Airlines
23 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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