Cheapest return flights from San Francisco to San Juan in December from 316€

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

Return flights

06 Dec - 10 Dec Frontier Airlines
02 Dec - 10 Dec Frontier Airlines
10 Dec - 18 Dec United
06 Dec - 13 Dec Frontier Airlines
11 Dec - 16 Dec Frontier Airlines
12 Dec - 16 Dec Frontier Airlines
13 Dec - 22 Dec American Airlines
13 Dec - 23 Dec United
31 Dec - 08 Jan United
30 Dec - 06 Jan Frontier Airlines
30 Dec - 07 Jan Frontier Airlines
31 Dec - 06 Jan Frontier Airlines
24 Dec - 12 Jan Sun Country Airlines
22 Dec - 07 Jan Sun Country Airlines
18 Dec - 22 Dec Sun Country Airlines
30 Dec - 05 Jan Frontier Airlines
31 Dec - 05 Jan Frontier Airlines
21 Dec - 26 Dec Sun Country Airlines
30 Dec - 04 Jan Frontier Airlines
31 Dec - 04 Jan Frontier Airlines

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

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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