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

Return flights

18 Sep - 05 Oct	Ethiopian Airlines
19 Sep - 15 Oct	Avianca
26 Sep - 28 Sep	Avianca
16 Sep - 20 Oct	Copa
16 Sep - 29 Sep	Copa
29 Sep - 06 Oct	LATAM Airlines Group
27 Sep - 25 Oct	Ethiopian Airlines
17 Sep - 14 Oct	Copa
20 Sep - 05 Oct	Copa
19 Sep - 30 Sep	Avianca
12 Sep - 19 Sep	Copa
10 Sep - 17 Sep	Copa
23 Sep - 30 Sep	Copa
12 Sep - 30 Sep	Copa
16 Sep - 30 Sep	Copa
10 Sep - 23 Sep	Copa
11 Sep - 09 Oct	Copa
11 Sep - 17 Sep	Copa
19 Sep - 03 Oct	Avianca
10 Sep - 31 Oct	Copa

Also check the deals for one-way flights from Sao Paulo to Seoul 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 Seoul in September from $1296

Return flights