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

Return flights

30 Aug - 02 Sep	Norwegian
22 Aug - 14 Sep	Iberia
30 Aug - 07 Sep	Norwegian
26 Aug - 31 Aug	Wizz Air Malta
19 Aug - 25 Aug	Wizz Air Malta
28 Aug - 04 Sep	Air Europa
13 Aug - 20 Aug	Wizz Air Malta
26 Aug - 30 Aug	Wizz Air Malta
29 Aug - 05 Sep	easyJet
23 Aug - 31 Aug	Wizz Air
20 Aug - 05 Sep	Wizz Air Malta
22 Aug - 05 Sep	Iberia
26 Aug - 29 Aug	Wizz Air Malta
12 Aug - 25 Aug	Wizz Air Malta
19 Aug - 28 Aug	Wizz Air Malta
21 Aug - 27 Aug	Vueling Airlines
31 Aug - 07 Sep	Vueling Airlines
25 Aug - 28 Aug	Air Europa
31 Aug - 05 Sep	Vueling Airlines
04 Aug - 29 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 227€

Return flights