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

Return flights

24 Sep - 30 Sep	Wizz Air UK
18 Sep - 26 Sep	Wizz Air UK
18 Sep - 27 Sep	Wizz Air UK
17 Sep - 21 Sep	Wizz Air UK
12 Sep - 16 Sep	Vueling Airlines
19 Sep - 27 Sep	Vueling Airlines
11 Sep - 14 Sep	Wizz Air UK
24 Sep - 30 Sep	Pegasus Airlines	direct
01 Sep - 06 Sep	easyJet
19 Sep - 27 Sep	Pegasus Airlines	direct

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

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 September from 148€

Return flights