AirHint found the following cheapest return flights from Los Angeles (LAX) to Barcelona (BCN) in September 2025 (see full year).

Return flights

29 Sep - 08 Oct	Air Canada
29 Sep - 09 Oct	Air Canada
24 Sep - 30 Sep	Air Canada
29 Sep - 25 Oct	Scandinavian Airlines
22 Sep - 08 Oct	Aer Lingus
24 Sep - 08 Oct	Delta
29 Sep - 10 Oct	Delta
30 Sep - 06 Oct	Austrian Airlines
30 Sep - 11 Oct	TAP
29 Sep - 15 Oct	SWISS
23 Sep - 29 Sep	SWISS
20 Sep - 24 Sep	Norse Atlantic Airways
24 Sep - 05 Oct	Air Canada
19 Sep - 24 Sep	Norse Atlantic Airways
22 Sep - 25 Sep	Norse Atlantic Airways
24 Sep - 28 Sep	Delta
26 Sep - 30 Sep	Lufthansa
26 Sep - 29 Sep	Lufthansa
25 Sep - 29 Sep	Lufthansa
21 Sep - 23 Sep	Norse Atlantic Airways (UK)

Also check the deals for one-way flights from Los Angeles 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 Los Angeles to Barcelona in September from $513

Return flights