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

Return flights

24 Sep - 27 Sep	Ryanair
04 Sep - 09 Sep	Iberia	direct
10 Sep - 25 Sep	Iberia
03 Sep - 09 Sep	Iberia	direct
02 Sep - 09 Sep	Iberia	direct
29 Sep - 06 Oct	Iberia
22 Sep - 06 Oct	Iberia	direct
15 Sep - 22 Sep	Iberia
15 Sep - 24 Sep	Iberia
25 Sep - 28 Sep	Iberia
11 Sep - 25 Sep	Iberia
08 Sep - 30 Sep	Iberia
19 Sep - 05 Oct	Ryanair
19 Sep - 04 Oct	Ryanair
20 Sep - 06 Oct	Iberia
18 Sep - 09 Oct	TAP
20 Sep - 05 Oct	Iberia
20 Sep - 04 Oct	Iberia
27 Sep - 05 Oct	Iberia	direct
13 Sep - 05 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 $649

Return flights