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

Return flights

24 Sep - 01 Oct	United
30 Sep - 07 Oct	United
09 Sep - 16 Sep	United
21 Sep - 28 Sep	United
18 Sep - 25 Sep	United
15 Sep - 22 Sep	United
12 Sep - 19 Sep	United
27 Sep - 04 Oct	United
06 Sep - 13 Sep	United
27 Sep - 01 Oct	Frontier Airlines

Also check the deals for one-way flights from San Juan to Barcelona 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 San Juan to Barcelona in September from 359€

Return flights