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

Return flights

01 May - 08 May	Lufthansa
16 May - 21 May	KLM
28 May - 04 Jun	KLM
07 May - 10 May	easyJet
22 May - 29 May	Lufthansa
16 May - 21 May	Turkish Airlines	direct
22 May - 29 May	Turkish Airlines	direct
07 May - 10 May	Turkish Airlines	direct
01 May - 08 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 $300

Return flights