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

Return flights

01 Sep - 01 Oct	Iberia
14 Sep - 21 Sep	Iberia
14 Sep - 28 Sep	Iberia
01 Sep - 14 Sep	Iberia	direct
08 Sep - 14 Sep	Iberia
10 Sep - 21 Sep	Iberia
01 Sep - 15 Sep	Iberia
03 Sep - 17 Sep	Iberia	direct
01 Sep - 17 Sep	Iberia	direct
21 Sep - 28 Sep	Iberia	direct
17 Sep - 23 Sep	Iberia
15 Sep - 05 Oct	Iberia
23 Sep - 03 Oct	Iberia	direct
25 Sep - 04 Oct	Iberia

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 $536

Return flights