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

Return flights

17 Dec - 15 Jan	Iberia	direct
03 Dec - 08 Dec	Iberia
02 Dec - 08 Dec	Iberia
02 Dec - 10 Dec	Iberia
08 Dec - 15 Dec	Finnair	direct
15 Dec - 15 Jan	Iberia	direct
08 Dec - 14 Dec	Finnair	direct
07 Dec - 14 Dec	Wizz Air Malta
15 Dec - 25 Dec	British Airways
30 Dec - 13 Jan	United
15 Dec - 21 Dec	Finnair	direct
01 Dec - 10 Dec	Iberia
13 Dec - 21 Dec	Iberia	direct
24 Dec - 08 Jan	Iberia
31 Dec - 11 Jan	Iberia
30 Dec - 07 Jan	Iberia
29 Dec - 05 Jan	Finnair	direct
24 Dec - 05 Jan	Iberia	direct
28 Dec - 08 Jan	Iberia
26 Dec - 07 Jan	Delta

Also check the deals for one-way flights from Madrid 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 Madrid to San Juan in December from 533€

Return flights