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

Return flights

23 Sep - 30 Sep	United
25 Sep - 02 Oct	United
29 Sep - 06 Oct	United
27 Sep - 04 Oct	United
09 Sep - 16 Sep	United
22 Sep - 29 Sep	Air France
11 Sep - 18 Sep	United
15 Sep - 22 Sep	United
05 Sep - 12 Sep	United
13 Sep - 20 Sep	United
20 Sep - 29 Sep	United
19 Sep - 26 Sep	United
21 Sep - 28 Sep	United
23 Sep - 08 Oct	Delta

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 445€

Return flights