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

One-Way flights

08 Dec	Frontier Airlines	direct
14 Dec	Frontier Airlines	direct
28 Dec	Delta	direct
07 Dec	United
01 Dec	United
03 Dec	United
25 Dec	Delta	direct
21 Dec	Frontier Airlines	direct
23 Dec	Delta	direct
26 Dec	Delta	direct

Also check the deals for return 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 one-way flights from Atlanta to San Juan in December from 77€

One-Way flights