AirHint found the following cheapest return flights from Hong Kong (HKG) to Barcelona (BCN) in September 2025 (see full year).

Return flights

24 Sep - 28 Sep	KLM
24 Sep - 29 Sep	KLM
24 Sep - 01 Oct	KLM
16 Sep - 23 Sep	Air France
09 Sep - 15 Sep	Air France
09 Sep - 18 Sep	Air France
23 Sep - 02 Oct	KLM
09 Sep - 16 Sep	Air France
22 Sep - 29 Sep	Air France
09 Sep - 26 Sep	Air France
11 Sep - 18 Sep	Air China
23 Sep - 28 Sep	KLM
22 Sep - 03 Oct	Air France
22 Sep - 01 Oct	Finnair
15 Sep - 30 Oct	Air France
22 Sep - 02 Oct	Air France
20 Sep - 01 Oct	Finnair
22 Sep - 04 Oct	Finnair
20 Sep - 02 Oct	Emirates
29 Sep - 02 Oct	Emirates

Also check the deals for one-way flights from Hong Kong 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 Hong Kong to Barcelona in September from $522

Return flights