AirHint found the following cheapest return flights from London (LON) to Sao Paulo (GRU) in September 2025 (see full year).

Return flights

18 Sep - 14 Oct	KLM
16 Sep - 16 Oct	KLM
17 Sep - 13 Oct	KLM
18 Sep - 27 Oct	Air Canada
24 Sep - 28 Sep	Vueling Airlines
24 Sep - 21 Oct	LATAM Airlines Group	direct
16 Sep - 07 Oct	KLM
23 Sep - 27 Sep	Vueling Airlines
18 Sep - 29 Oct	KLM
23 Sep - 28 Sep	Ryanair
23 Sep - 03 Oct	Ryanair
25 Sep - 27 Oct	easyJet
24 Sep - 08 Oct	Vueling Airlines
23 Sep - 30 Sep	Avianca
19 Sep - 30 Sep	Avianca
20 Sep - 30 Sep	Avianca
24 Sep - 30 Sep	Avianca
16 Sep - 30 Sep	Avianca
22 Sep - 29 Sep	Ryanair
16 Sep - 23 Sep	KLM

Also check the deals for one-way flights from London to Sao Paulo 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 London to Sao Paulo in September from $825

Return flights