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

Return flights

12 Sep - 21 Sep	WORLD2FLY
22 Sep - 07 Oct	Wizz Air Malta
03 Sep - 09 Sep	Iberia	direct
22 Sep - 28 Sep	Wizz Air Malta
11 Sep - 23 Sep	Iberia	direct
02 Sep - 09 Sep	Iberia	direct
15 Sep - 13 Oct	Iberia
02 Sep - 11 Sep	Iberia	direct
01 Sep - 11 Sep	Iberia
19 Sep - 28 Sep	Ryanair
25 Sep - 28 Sep	easyJet
15 Sep - 21 Sep	Wizz Air Malta
19 Sep - 08 Oct	Iberia
20 Sep - 05 Oct	Iberia
27 Sep - 09 Oct	Iberia	direct
15 Sep - 13 Oct	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 552€

Return flights