AirHint found the following cheapest return flights from Bilbao (BIO) to Kuala Lumpur (KUL) in September 2025 (see full year).

Return flights

24 Sep - 09 Oct	Vueling Airlines
23 Sep - 10 Oct	Vueling Airlines
23 Sep - 09 Oct	Etihad Airways
22 Sep - 07 Oct	Air Europa
24 Sep - 10 Oct	Etihad Airways
22 Sep - 09 Oct	Vueling Airlines
22 Sep - 08 Oct	Etihad Airways
23 Sep - 30 Sep	Vueling Airlines
20 Sep - 10 Oct	Vueling Airlines
23 Sep - 11 Oct	Etihad Airways
22 Sep - 11 Oct	Vueling Airlines
01 Sep - 07 Sep	KLM
15 Sep - 29 Sep	Vueling Airlines
03 Sep - 20 Sep	Vueling Airlines
03 Sep - 25 Sep	Vueling Airlines
05 Sep - 16 Sep	Volotea
03 Sep - 10 Sep	Air Europa

Also check the deals for one-way flights from Bilbao to Kuala Lumpur 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 Bilbao to Kuala Lumpur in September from $692

Return flights