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

Return flights

02 Dec - 12 Dec	KLM
02 Dec - 16 Dec	United
02 Dec - 16 Dec	Iberia	direct
29 Dec - 13 Jan	British Airways
02 Dec - 12 Dec	American Airlines	direct
07 Dec - 16 Dec	KLM
07 Dec - 16 Dec	Finnair	direct
30 Dec - 09 Jan	British Airways
05 Dec - 13 Dec	Finnair	direct
05 Dec - 12 Dec	Iberia	direct
31 Dec - 11 Jan	American Airlines
25 Dec - 05 Jan	British Airways
31 Dec - 11 Jan	Iberia	direct
13 Dec - 29 Dec	United
30 Dec - 16 Jan	KLM
25 Dec - 01 Jan	United
26 Dec - 05 Jan	British Airways
21 Dec - 28 Dec	Delta
26 Dec - 11 Jan	jetBlue
26 Dec - 04 Jan	Avianca

Also check the deals for one-way flights from San Juan to Madrid 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 San Juan to Madrid in December from $460

Return flights