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

Return flights

05 Dec - 07 Dec	Frontier Airlines
07 Dec - 11 Dec	Frontier Airlines
24 Dec - 29 Dec	Frontier Airlines
31 Dec - 08 Jan	jetBlue
15 Dec - 20 Dec	Frontier Airlines
31 Dec - 09 Jan	jetBlue
07 Dec - 12 Dec	Lufthansa
24 Dec - 03 Jan	Lufthansa
15 Dec - 25 Dec	United
01 Dec - 07 Dec	jetBlue
27 Dec - 04 Jan	Lufthansa
22 Dec - 29 Dec	jetBlue
12 Dec - 21 Dec	Southwest Airlines
25 Dec - 31 Dec	Lufthansa
20 Dec - 07 Jan	jetBlue
21 Dec - 08 Jan	jetBlue
21 Dec - 09 Jan	jetBlue
19 Dec - 05 Jan	jetBlue
27 Dec - 01 Jan	American Airlines
29 Dec - 04 Jan	American Airlines

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

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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Cheapest return flights from New York to San Juan in December from $238

Return flights