AirHint found the following cheapest one-way flights from Bilbao (BIO) to Brussels (BRU) in September 2025 (see full year).

One-Way flights

17 Sep	Vueling Airlines	direct
03 Sep	Vueling Airlines	direct
02 Sep	Vueling Airlines	direct
09 Sep	Vueling Airlines	direct
10 Sep	Vueling Airlines	direct
24 Sep	Vueling Airlines	direct
07 Sep	Vueling Airlines
06 Sep	Vueling Airlines
16 Sep	Vueling Airlines
22 Sep	Vueling Airlines

Also check the deals for return flights from Bilbao to Brussels 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 one-way flights from Bilbao to Brussels in September from $44

One-Way flights