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

Return flights

28 Aug - 03 Sep	Vueling Airlines
12 Aug - 19 Aug	Vueling Airlines
28 Aug - 05 Sep	Volotea
20 Aug - 26 Aug	Wizz Air Malta
06 Aug - 17 Aug	Wizz Air Malta
12 Aug - 26 Aug	Wizz Air Malta
02 Aug - 12 Aug	Wizz Air Malta
29 Aug - 05 Sep	easyJet
11 Aug - 17 Aug	Vueling Airlines
04 Aug - 24 Aug	Wizz Air Malta
01 Aug - 02 Sep	Vueling Airlines
23 Aug - 30 Aug	Air Europa
02 Aug - 10 Aug	Wizz Air Malta
05 Aug - 09 Aug	Wizz Air Malta

Also check the deals for one-way flights from Bilbao to Bucharest 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 Bucharest in August from 186€

Return flights