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

Return flights

08 Dec - 15 Dec	Iberia
09 Dec - 18 Dec	British Airways	direct
10 Dec - 18 Dec	Iberia	direct
09 Dec - 16 Dec	British Airways	direct
11 Dec - 14 Dec	Iberia
13 Dec - 16 Dec	Iberia	direct
05 Dec - 08 Dec	Iberia	direct
05 Dec - 10 Dec	Iberia
13 Dec - 17 Dec	British Airways	direct
06 Dec - 16 Dec	Iberia	direct
15 Dec - 15 Jan	Iberia	direct
31 Dec - 15 Jan	Iberia	direct
17 Dec - 26 Jan	United
30 Dec - 15 Jan	Iberia	direct
30 Dec - 13 Jan	Iberia	direct
30 Dec - 12 Jan	Iberia
17 Dec - 26 Jan	Aer Lingus	direct
23 Dec - 11 Jan	TAP
26 Dec - 10 Jan	Air Canada
24 Dec - 11 Jan	United

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 486€

Return flights