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

Return flights

22 Sep - 24 Oct	Air Canada
22 Sep - 08 Oct	KLM
18 Sep - 05 Oct	Ethiopian Airlines
22 Sep - 15 Oct	KLM
27 Sep - 29 Sep	Copa
29 Sep - 22 Oct	Air France
09 Sep - 08 Oct	Air France
17 Sep - 29 Sep	Copa
16 Sep - 29 Sep	Copa
17 Sep - 06 Oct	Copa
27 Sep - 25 Oct	Ethiopian Airlines
18 Sep - 24 Sep	LATAM Airlines Group
12 Sep - 19 Sep	Copa
19 Sep - 30 Sep	Avianca
13 Sep - 19 Oct	Copa
10 Sep - 21 Sep	Copa
10 Sep - 31 Oct	Copa
15 Sep - 22 Sep	Arajet
12 Sep - 30 Sep	Copa
09 Sep - 23 Sep	Avianca

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 983€

Return flights