AirHint found the following cheapest return flights from Bilbao (BIO) to Istanbul (IST) in May 2026 (see full year).

Return flights

08 May - 17 May	Vueling Airlines
09 May - 17 May	Vueling Airlines
13 May - 17 May	Vueling Airlines
14 May - 17 May	Wizz Air UK
05 May - 10 May	Vueling Airlines
02 May - 09 May	Vueling Airlines
28 May - 11 Jun	Vueling Airlines
21 May - 25 May	Lufthansa
19 May - 21 May	Air Europa
21 May - 25 May	Turkish Airlines	direct
02 May - 09 May	Turkish Airlines	direct

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

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 May from 165€

Return flights