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 - 10 Dec	Iberia
02 Dec - 10 Dec	Iberia
02 Dec - 09 Dec	Iberia
02 Dec - 11 Dec	Iberia
05 Dec - 12 Dec	Iberia
15 Dec - 15 Jan	Iberia	direct
08 Dec - 18 Dec	Iberia	direct
07 Dec - 14 Dec	Finnair	direct
05 Dec - 16 Dec	Iberia
03 Dec - 18 Dec	Iberia
06 Dec - 16 Dec	Iberia
17 Dec - 02 Jan	Iberia	direct
29 Dec - 05 Jan	Finnair	direct
30 Dec - 09 Jan	KLM
25 Dec - 01 Jan	Iberia	direct
25 Dec - 02 Jan	Iberia	direct
30 Dec - 08 Jan	Delta
19 Dec - 01 Jan	Iberia	direct
19 Dec - 05 Jan	Iberia	direct

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