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

Return flights

13 Sep - 26 Sep	Iberia
16 Sep - 24 Sep	Lufthansa
08 Sep - 21 Sep	Lufthansa
16 Sep - 28 Sep	Iberia
14 Sep - 21 Sep	TAP
26 Sep - 28 Sep	United
15 Sep - 25 Sep	United
19 Sep - 28 Sep	Lufthansa
18 Sep - 28 Sep	Lufthansa
24 Sep - 05 Oct	Lufthansa
06 Sep - 27 Sep	Delta
18 Sep - 02 Oct	Iberia
25 Sep - 03 Oct	TAP
29 Sep - 03 Oct	Wizz Air Malta

Also check the deals for one-way flights from Barcelona 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 Barcelona to San Juan in September from $647

Return flights