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

Return flights

28 Sep - 08 Oct	Air France
30 Sep - 15 Oct	British Airways
22 Sep - 30 Sep	Air France
22 Sep - 04 Oct	United
22 Sep - 29 Sep	United
30 Sep - 11 Oct	British Airways
24 Sep - 30 Sep	KLM
25 Sep - 01 Oct	United
25 Sep - 07 Oct	United
26 Sep - 03 Oct	British Airways
26 Sep - 28 Sep	United
20 Sep - 27 Sep	Frontier Airlines
29 Sep - 02 Oct	Frontier Airlines
20 Sep - 29 Sep	jetBlue
20 Sep - 27 Sep	Iberia	direct
19 Sep - 21 Sep	Air France
20 Sep - 30 Sep	Avianca
19 Sep - 04 Oct	Iberia	direct
19 Sep - 21 Sep	Iberia	direct

Also check the deals for one-way flights from San Juan to Madrid 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 San Juan to Madrid in September from $386

Return flights