AirHint found the following cheapest return flights from Rio De Janeiro (SDU) to London (LHR) in September 2025 (see full year).

Return flights

30 Sep - 07 Oct	LATAM Airlines Group
30 Sep - 29 Oct	LATAM Airlines Group
29 Sep - 26 Oct	LATAM Airlines Group
25 Sep - 13 Oct	LATAM Airlines Group
29 Sep - 28 Oct	LATAM Airlines Group
23 Sep - 02 Oct	LATAM Airlines Group
23 Sep - 30 Sep	LATAM Airlines Group
29 Sep - 27 Oct	LATAM Airlines Group
28 Sep - 05 Oct	LATAM Airlines Group
29 Sep - 30 Oct	LATAM Airlines Group
29 Sep - 29 Oct	LATAM Airlines Group
25 Sep - 30 Sep	LATAM Airlines Group
28 Sep - 30 Sep	LATAM Airlines Group
19 Sep - 22 Sep	TAP
20 Sep - 24 Sep	TAP

Also check the deals for one-way flights from Rio De Janeiro 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 Rio De Janeiro to London in September from $1019

Return flights