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

Return flights

30 Dec - 13 Jan	Iberia
05 Dec - 10 Dec	Lufthansa
11 Dec - 18 Dec	American Airlines	direct
09 Dec - 18 Dec	British Airways	direct
08 Dec - 23 Dec	Iberia	direct
05 Dec - 09 Dec	Lufthansa
05 Dec - 07 Dec	United
05 Dec - 08 Dec	Brussels Airlines
14 Dec - 23 Dec	Iberia	direct
05 Dec - 15 Dec	United
12 Dec - 19 Dec	American Airlines	direct
30 Dec - 12 Jan	Iberia	direct
30 Dec - 15 Jan	Iberia
30 Dec - 11 Jan	Iberia
30 Dec - 11 Jan	Iberia	direct
27 Dec - 10 Jan	Iberia Express
31 Dec - 11 Jan	Iberia	direct
24 Dec - 08 Jan	Iberia
31 Dec - 08 Jan	Iberia	direct
13 Dec - 06 Jan	Air Europa

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 564€

Return flights