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

Return flights

01 Oct - 15 Oct	Avianca
08 Oct - 20 Oct	Avianca
17 Oct - 27 Oct	TAP
16 Oct - 24 Oct	TAP
31 Oct - 11 Nov	Lufthansa
06 Oct - 24 Oct	TAP
14 Oct - 26 Oct	KLM
06 Oct - 18 Oct	LATAM Airlines Group
21 Oct - 04 Nov	Lufthansa
01 Oct - 10 Nov	KLM
24 Oct - 08 Nov	SWISS
15 Oct - 29 Oct	KLM
14 Oct - 31 Oct	KLM
07 Oct - 18 Oct	Lufthansa

Also check the deals for one-way flights from Sao Paulo to Keflavik 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 Keflavik in October from 877€

Return flights