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

Return flights

29 Aug - 19 Sep	easyJet
28 Aug - 01 Sep	Vueling Airlines
28 Aug - 03 Sep	Iberia
20 Aug - 26 Aug	Wizz Air Malta
22 Aug - 14 Sep	Iberia
20 Aug - 27 Aug	Wizz Air Malta
22 Aug - 26 Aug	Iberia
16 Aug - 23 Aug	Wizz Air
15 Aug - 25 Aug	Vueling Airlines
26 Aug - 30 Aug	Wizz Air
12 Aug - 16 Aug	Wizz Air
23 Aug - 27 Aug	Air Europa
20 Aug - 24 Aug	Wizz Air Malta
27 Aug - 31 Aug	Wizz Air Malta
31 Aug - 05 Sep	Vueling Airlines
30 Aug - 06 Sep	Wizz Air
30 Aug - 07 Sep	Wizz Air
28 Aug - 05 Sep	Vueling Airlines
29 Aug - 18 Sep	Vueling Airlines
31 Aug - 18 Sep	Vueling Airlines

Also check the deals for one-way flights from Bilbao to Istanbul 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 Istanbul in August from 189€

Return flights