Cheapest return flights from San Diego to San Juan in December from $409

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

Return flights

29 Dec - 15 Jan United
29 Dec - 06 Jan Frontier Airlines
30 Dec - 13 Jan Southwest Airlines
24 Dec - 30 Dec Frontier Airlines
30 Dec - 15 Jan American Airlines
29 Dec - 05 Jan Frontier Airlines
30 Dec - 10 Jan United
29 Dec - 10 Jan United
19 Dec - 08 Jan Frontier Airlines
24 Dec - 29 Dec Frontier Airlines
19 Dec - 24 Dec American Airlines
25 Dec - 01 Jan Frontier Airlines
28 Dec - 10 Jan United
26 Dec - 30 Dec jetBlue
19 Dec - 26 Dec Frontier Airlines

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

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