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

Return flights

09 May - 17 May	Vueling Airlines
10 May - 20 May	Vueling Airlines
01 May - 08 May	Aegean Airlines
18 May - 22 May	Vueling Airlines
25 May - 05 Jun	Vueling Airlines
28 May - 11 Jun	Vueling Airlines
17 May - 27 May	Lufthansa
28 May - 01 Jun	Vueling Airlines
21 May - 24 May	Wizz Air UK
18 May - 22 May	Turkish Airlines	direct
25 May - 05 Jun	Turkish Airlines	direct
21 May - 24 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 $199

Return flights