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

Return flights

25 Sep - 28 Sep	TAP
29 Sep - 13 Oct	TAP
16 Sep - 27 Oct	TAP
30 Sep - 14 Oct	TAP
29 Sep - 05 Oct	TAP
28 Sep - 13 Oct	TAP
29 Sep - 17 Oct	TAP
09 Sep - 23 Sep	TAP
09 Sep - 04 Oct	TAP
28 Sep - 05 Oct	Air Europa
05 Sep - 09 Sep	TAP
29 Sep - 19 Oct	TAP
25 Sep - 14 Oct	TAP
11 Sep - 21 Sep	Avianca
23 Sep - 30 Sep	TAP
23 Sep - 29 Sep	TAP
23 Sep - 28 Sep	TAP
26 Sep - 28 Sep	TAP
05 Sep - 21 Sep	Air Europa
18 Sep - 30 Sep	TAP

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 $949

Return flights