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

Return flights

29 Sep - 06 Oct	Avianca
22 Sep - 26 Sep	Avianca
24 Sep - 28 Sep	Avianca
24 Sep - 26 Sep	Avianca
24 Sep - 05 Oct	Avianca
23 Sep - 29 Sep	Avianca
23 Sep - 06 Oct	Avianca
22 Sep - 27 Oct	Avianca
30 Sep - 05 Oct	Avianca
30 Sep - 06 Oct	Avianca
22 Sep - 27 Sep	Avianca
22 Sep - 06 Oct	Avianca
22 Sep - 28 Sep	Avianca
17 Sep - 24 Sep	Ethiopian Airlines
26 Sep - 05 Oct	Avianca
23 Sep - 14 Oct	GOL Linhas Aéreas
29 Sep - 07 Oct	Avianca
23 Sep - 30 Sep	Avianca
15 Sep - 22 Sep	GOL Linhas Aéreas
15 Sep - 24 Sep	GOL Linhas Aéreas

Also check the deals for one-way flights from Sao Paulo to London 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 Sao Paulo to London in September from 690€

Return flights