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

Return flights

28 Sep - 05 Oct	TAP
30 Sep - 14 Oct	TAP
29 Sep - 13 Oct	TAP
29 Sep - 05 Oct	TAP
30 Sep - 30 Oct	TAP
30 Sep - 08 Oct	TAP
29 Sep - 07 Oct	TAP
23 Sep - 28 Sep	TAP
25 Sep - 06 Oct	TAP
25 Sep - 10 Oct	TAP
23 Sep - 08 Oct	TAP
24 Sep - 30 Sep	TAP
23 Sep - 30 Sep	TAP
23 Sep - 29 Sep	TAP
24 Sep - 29 Sep	TAP
22 Sep - 28 Sep	TAP
26 Sep - 28 Sep	TAP
11 Sep - 21 Sep	British Airways
15 Sep - 23 Sep	Iberia
16 Sep - 23 Sep	British Airways

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 $712

Return flights