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

Return flights

30 Jul - 06 Aug	Wizz Air Malta
28 Jul - 01 Aug	KLM
29 Jul - 05 Aug	Wizz Air Malta
31 Jul - 05 Aug	easyJet
31 Jul - 07 Aug	easyJet
29 Jul - 03 Aug	Wizz Air Malta
28 Jul - 02 Aug	Wizz Air Malta
30 Jul - 10 Aug	Wizz Air Malta
27 Jul - 04 Aug	Vueling Airlines
31 Jul - 10 Aug	easyJet

Also check the deals for one-way flights from Bilbao to Istanbul in July.

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 July from 313€

Return flights