AirHint found the following cheapest one-way flights from Porto (OPO) to Bilbao (BIO) in August 2025 (see full year).

One-Way flights

29 Aug	Air Europa
27 Aug	Air Europa
26 Aug	Vueling Airlines	direct
19 Aug	Vueling Airlines	direct
12 Aug	Vueling Airlines	direct
21 Aug	Air Europa
25 Aug	Air Europa
20 Aug	Air Europa
24 Aug	Vueling Airlines	direct
18 Aug	TAP

Also check the deals for return flights from Porto to Bilbao 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 one-way flights from Porto to Bilbao in August from 90€

One-Way flights