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	Air Canada
17 Sep - 24 Sep	United
02 Sep - 09 Sep	United
08 Sep - 16 Sep	United
22 Sep - 29 Sep	KLM
26 Sep - 03 Oct	United
08 Sep - 15 Sep	United
14 Sep - 21 Sep	United
05 Sep - 12 Sep	United
11 Sep - 18 Sep	United
20 Sep - 27 Sep	United

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.

Book a cheap hotel in Barcelona

Cheap car rent in Barcelona

Cheapest return flights from San Juan to Barcelona in September from $421

Return flights