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

Return flights

10 Sep - 24 Sep	TAP
08 Sep - 24 Sep	TAP
11 Sep - 23 Sep	TAP
09 Sep - 16 Sep	TAP
09 Sep - 27 Sep	TAP
08 Sep - 27 Sep	TAP
10 Sep - 10 Oct	TAP
10 Sep - 01 Oct	TAP
08 Sep - 29 Sep	TAP
11 Sep - 27 Sep	TAP
04 Sep - 24 Sep	TAP
07 Sep - 16 Sep	TAP
19 Sep - 17 Oct	Air France
19 Sep - 09 Oct	Air France
16 Sep - 14 Oct	Air France
14 Sep - 14 Oct	Air France
17 Sep - 19 Oct	TAP
21 Sep - 01 Oct	Avianca
02 Sep - 02 Oct	Air France
14 Sep - 26 Oct	TAP

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 $700

Return flights