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

Return flights

04 Dec - 07 Dec	Delta	direct
11 Dec - 15 Dec	jetBlue
06 Dec - 13 Dec	Delta	direct
21 Dec - 28 Dec	Delta	direct
23 Dec - 03 Jan	Southwest Airlines
27 Dec - 05 Jan	Southwest Airlines
22 Dec - 02 Jan	Southwest Airlines
22 Dec - 02 Jan	Delta	direct
27 Dec - 05 Jan	Delta	direct
20 Dec - 27 Dec	jetBlue
19 Dec - 28 Dec	Sun Country Airlines
23 Dec - 03 Jan	Delta	direct

Also check the deals for one-way flights from Atlanta 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 Atlanta to San Juan in December from $397

Return flights