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

One-Way flights

06 Dec	Frontier Airlines
12 Dec	Frontier Airlines
02 Dec	KLM
14 Dec	Avianca
07 Dec	United
21 Dec	Hahn Air Technologies
19 Dec	Hahn Air Technologies
06 Dec	Finnair	direct
02 Dec	Finnair	direct
07 Dec	Finnair	direct

Also check the deals for return 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 one-way flights from San Juan to Madrid in December from $332

One-Way flights