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

Return flights

03 Sep - 31 Oct	Qatar Airways
03 Sep - 17 Sep	Lufthansa
03 Sep - 16 Sep	Lufthansa
09 Sep - 16 Sep	Ryanair
09 Sep - 23 Sep	Air France
05 Sep - 10 Sep	Air France
10 Sep - 17 Sep	Air France
07 Sep - 17 Sep	easyJet
03 Sep - 08 Sep	Air France
10 Sep - 21 Sep	easyJet
03 Sep - 10 Sep	Air France
24 Sep - 17 Oct	Iberia
29 Sep - 16 Oct	Finnair
30 Sep - 10 Oct	KLM
27 Sep - 07 Oct	KLM
28 Sep - 08 Oct	LOT
30 Sep - 07 Oct	LOT
28 Sep - 05 Oct	Iberia
26 Sep - 08 Oct	SWISS
29 Sep - 06 Oct	Finnair

Also check the deals for one-way flights from Lisbon 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 Lisbon to Seoul in September from $768

Return flights