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

Return flights

12 Dec - 11 Jan	Norse Atlantic Airways
13 Dec - 12 Jan	Norse Atlantic Airways
06 Dec - 14 Dec	TAP
04 Dec - 14 Dec	United
06 Dec - 13 Dec	Brussels Airlines
07 Dec - 16 Dec	Air France
13 Dec - 06 Jan	Norse Atlantic Airways
31 Dec - 10 Jan	Air Serbia
31 Dec - 08 Jan	Air Serbia
31 Dec - 09 Jan	Air Serbia
27 Dec - 09 Jan	Wizz Air Malta
18 Dec - 01 Jan	KLM
27 Dec - 08 Jan	Wizz Air Malta
24 Dec - 01 Jan	Delta
22 Dec - 28 Dec	SWISS
23 Dec - 27 Dec	KLM

Also check the deals for one-way flights from Rome 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 Rome to San Juan in December from $679

Return flights