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

Return flights

30 Dec - 14 Jan	Iberia
31 Dec - 13 Jan	Iberia	direct
05 Dec - 11 Dec	Lufthansa
05 Dec - 15 Dec	Lufthansa
05 Dec - 09 Dec	Lufthansa
03 Dec - 15 Dec	United
03 Dec - 08 Dec	United
03 Dec - 12 Dec	United
08 Dec - 23 Dec	Iberia	direct
09 Dec - 18 Dec	British Airways	direct
16 Dec - 23 Dec	Iberia	direct
05 Dec - 12 Dec	Lufthansa
15 Dec - 15 Jan	United
30 Dec - 12 Jan	Iberia	direct
31 Dec - 12 Jan	Iberia	direct
09 Dec - 11 Jan	Air Europa
30 Dec - 11 Jan	Iberia
29 Dec - 12 Jan	TAP
23 Dec - 17 Jan	Air France
30 Dec - 10 Jan	Iberia

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 $656

Return flights