AirHint found the following cheapest return flights from Bilbao (BIO) to Basel (BSL) in August 2025 (see full year).

Return flights

19 Aug - 26 Aug	easyJet	direct
29 Aug - 02 Sep	easyJet	direct
22 Aug - 26 Aug	easyJet	direct
26 Aug - 02 Sep	easyJet	direct
19 Aug - 22 Aug	easyJet	direct
20 Aug - 26 Aug	Air Europa
19 Aug - 29 Aug	easyJet	direct
26 Aug - 29 Aug	easyJet	direct
29 Aug - 05 Sep	easyJet	direct
27 Aug - 05 Sep	Lufthansa
29 Aug - 06 Sep	Volotea
27 Aug - 06 Sep	Lufthansa
29 Aug - 04 Sep	Lufthansa
25 Aug - 29 Aug	Air Europa
20 Aug - 28 Aug	KLM
30 Aug - 03 Sep	KLM
31 Aug - 05 Sep	Lufthansa
23 Aug - 27 Aug	Lufthansa
26 Aug - 30 Aug	easyJet
31 Aug - 04 Sep	Lufthansa

Also check the deals for one-way flights from Bilbao to Basel in August.

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 Basel in August from 144€

Return flights