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

Return flights

29 Dec - 04 Jan	Aeromexico
28 Dec - 03 Jan	Copa
22 Dec - 27 Dec	Copa
22 Dec - 29 Dec	Copa
01 Dec - 08 Dec	Arajet
21 Dec - 10 Jan	Spirit Airlines
28 Dec - 10 Jan	Spirit Airlines
29 Dec - 10 Jan	Spirit Airlines
22 Dec - 10 Jan	Spirit Airlines
21 Dec - 09 Jan	Spirit Airlines
21 Dec - 08 Jan	Spirit Airlines
20 Dec - 09 Jan	Spirit Airlines
20 Dec - 08 Jan	Spirit Airlines
21 Dec - 29 Dec	Spirit Airlines
20 Dec - 29 Dec	Spirit Airlines
28 Dec - 29 Dec	Spirit Airlines
21 Dec - 27 Dec	Spirit Airlines
19 Dec - 29 Dec	Spirit Airlines
20 Dec - 27 Dec	Spirit Airlines
19 Dec - 27 Dec	Spirit Airlines

Also check the deals for one-way flights from Cancun 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 Cancun to San Juan in December from $423

Return flights