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

Return flights

22 Sep - 30 Sep	British Airways	direct
23 Sep - 30 Sep	British Airways	direct
24 Sep - 01 Oct	Iberia	direct
30 Sep - 07 Oct	United
30 Sep - 14 Oct	United
21 Sep - 02 Oct	Air France
20 Sep - 30 Sep	Air France
17 Sep - 24 Sep	United
17 Sep - 02 Oct	United
20 Sep - 30 Sep	Iberia	direct
18 Sep - 24 Sep	Iberia	direct
09 Sep - 16 Sep	British Airways	direct
10 Sep - 17 Sep	British Airways	direct
09 Sep - 24 Sep	Iberia	direct
30 Sep - 13 Oct	United
26 Sep - 03 Oct	KLM
15 Sep - 16 Oct	United
09 Sep - 07 Oct	Air France
03 Sep - 09 Sep	United
22 Sep - 04 Oct	Air France

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 387€

Return flights