AirHint found the following cheapest return flights from Madrid (MAD) to San Juan (SJU) in September 2026 (see full year).

Return flights

14 Sep - 21 Sep	Iberia
01 Sep - 15 Sep	Iberia
01 Sep - 15 Sep	British Airways	direct
03 Sep - 16 Sep	Iberia
21 Sep - 27 Sep	Iberia
01 Sep - 08 Sep	Iberia
01 Sep - 09 Sep	Iberia
04 Sep - 12 Sep	Iberia	direct
04 Sep - 13 Sep	Iberia	direct

Also check the deals for one-way flights from Madrid to San Juan in September.

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 September from 588€

Return flights