Cheapest return flights from Philadelphia to San Juan in December from $164

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

Return flights

30 Dec - 09 Jan Frontier Airlines
30 Dec - 08 Jan Frontier Airlines
30 Dec - 10 Jan Frontier Airlines
29 Dec - 09 Jan Frontier Airlines
31 Dec - 16 Jan Spirit Airlines direct
31 Dec - 17 Jan Spirit Airlines direct
31 Dec - 13 Jan Spirit Airlines direct
31 Dec - 10 Jan Frontier Airlines
31 Dec - 12 Jan Spirit Airlines direct
28 Dec - 09 Jan Frontier Airlines direct
22 Dec - 24 Dec Frontier Airlines
15 Dec - 20 Dec Frontier Airlines
21 Dec - 24 Dec Frontier Airlines
21 Dec - 25 Dec Frontier Airlines
22 Dec - 29 Dec jetBlue
15 Dec - 22 Dec Frontier Airlines
15 Dec - 18 Dec Spirit Airlines
22 Dec - 26 Dec Frontier Airlines
15 Dec - 19 Dec Frontier Airlines
21 Dec - 27 Dec Frontier Airlines

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

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