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

Return flights

01 Dec - 05 Dec	Delta	direct
04 Dec - 06 Dec	Delta	direct
02 Dec - 09 Dec	Delta	direct
03 Dec - 09 Dec	Delta	direct
11 Dec - 14 Dec	Frontier Airlines
05 Dec - 08 Dec	Southwest Airlines
05 Dec - 07 Dec	Southwest Airlines
05 Dec - 09 Dec	Southwest Airlines
04 Dec - 07 Dec	Southwest Airlines
04 Dec - 07 Dec	Delta	direct
29 Dec - 02 Jan	Delta	direct
28 Dec - 01 Jan	Delta	direct
19 Dec - 01 Jan	Southwest Airlines
19 Dec - 04 Jan	Southwest Airlines
27 Dec - 03 Jan	Delta	direct
19 Dec - 01 Jan	Delta	direct
19 Dec - 04 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 229€

Return flights