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

Return flights

28 Apr - 03 May	Vueling Airlines
25 Apr - 03 May	Vueling Airlines
06 Apr - 16 Apr	Lufthansa
03 Apr - 08 Apr	Aegean Airlines
30 Apr - 03 May	Wizz Air UK
07 Apr - 12 Apr	Aegean Airlines
14 Apr - 19 Apr	Lufthansa
03 Apr - 09 Apr	Aegean Airlines
05 Apr - 12 Apr	Air Europa
24 Apr - 01 May	Vueling Airlines
01 Apr - 12 Apr	Air Europa
03 Apr - 10 Apr	Aegean Airlines
02 Apr - 08 Apr	Air Europa
04 Apr - 11 Apr	Lufthansa
24 Apr - 01 May	Turkish Airlines	direct

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

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 April from 184€

Return flights