AirHint found the following cheapest return flights from Sao Paulo (GRU) to Istanbul (IST) in October 2025 (see full year).

Return flights

17 Oct - 09 Nov	British Airways
27 Oct - 10 Nov	British Airways
27 Oct - 06 Nov	British Airways
01 Oct - 08 Oct	British Airways
27 Oct - 08 Nov	British Airways
15 Oct - 27 Oct	British Airways
14 Oct - 27 Oct	British Airways
20 Oct - 27 Oct	British Airways
17 Oct - 08 Nov	British Airways
18 Oct - 17 Nov	KLM
21 Oct - 07 Nov	KLM
22 Oct - 07 Nov	KLM
26 Oct - 08 Nov	KLM
15 Oct - 22 Oct	TAP
15 Oct - 15 Nov	KLM
08 Oct - 15 Oct	British Airways
16 Oct - 22 Oct	TAP
23 Oct - 30 Oct	British Airways
20 Oct - 30 Oct	British Airways
16 Oct - 27 Oct	British Airways

Also check the deals for one-way flights from Sao Paulo to Istanbul in October.

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 Sao Paulo to Istanbul in October from $841

Return flights