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

Return flights

24 Apr - 28 Apr	Lufthansa
23 Apr - 27 Apr	Lufthansa
25 Apr - 02 May	Air Europa
02 Apr - 06 Apr	Air Europa
03 Apr - 06 Apr	Air Europa
02 Apr - 05 Apr	Air Europa
03 Apr - 10 Apr	Air Europa
23 Apr - 27 Apr	Turkish Airlines	direct
13 Apr - 17 Apr	Iberia
24 Apr - 28 Apr	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.

Book a cheap hotel in Istanbul

Cheap car rent in Istanbul

Cheapest return flights from Bilbao to Istanbul in April from 196€

Return flights