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

Return flights

26 Aug - 09 Sep	jetBlue
30 Aug - 13 Sep	WORLD2FLY
31 Aug - 11 Sep	Iberia
30 Aug - 06 Sep	WORLD2FLY
26 Aug - 11 Sep	WORLD2FLY
29 Aug - 06 Sep	WORLD2FLY
26 Aug - 06 Sep	WORLD2FLY
28 Aug - 04 Sep	jetBlue
27 Aug - 05 Sep	WORLD2FLY
22 Aug - 12 Sep	WORLD2FLY
23 Aug - 31 Aug	WORLD2FLY
23 Aug - 30 Aug	WORLD2FLY
22 Aug - 30 Aug	WORLD2FLY
26 Aug - 31 Aug	WORLD2FLY
20 Aug - 27 Aug	WORLD2FLY
20 Aug - 30 Aug	WORLD2FLY
22 Aug - 25 Aug	WORLD2FLY
25 Aug - 31 Aug	WORLD2FLY
24 Aug - 31 Aug	WORLD2FLY
22 Aug - 27 Aug	WORLD2FLY

Also check the deals for one-way flights from Madrid to San Juan in August.

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 August from $683

Return flights