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

Return flights

02 Dec - 09 Dec	KLM
03 Dec - 12 Dec	Air Canada
02 Dec - 10 Dec	Delta
01 Dec - 10 Dec	KLM
08 Dec - 15 Dec	American Airlines
03 Dec - 10 Dec	Iberia
10 Dec - 24 Dec	United
30 Dec - 16 Jan	British Airways
31 Dec - 12 Jan	British Airways
25 Dec - 16 Jan	British Airways
29 Dec - 13 Jan	British Airways
09 Dec - 23 Dec	Delta
08 Dec - 16 Dec	American Airlines
11 Dec - 10 Jan	British Airways
27 Dec - 10 Jan	British Airways
06 Dec - 08 Dec	Frontier Airlines
29 Dec - 08 Jan	British Airways
20 Dec - 10 Jan	Avianca
20 Dec - 11 Jan	Avianca
20 Dec - 08 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 $376

Return flights