AirHint found the following cheapest return flights from Seoul (ICN) to Lisbon (LIS) in September 2026 (see full year).

Return flights

01 Sep - 10 Sep	Lufthansa
02 Sep - 16 Sep	Lufthansa
02 Sep - 09 Sep	Lufthansa
01 Sep - 08 Sep	Lufthansa
10 Sep - 16 Sep	Air France
09 Sep - 16 Sep	Lufthansa
23 Sep - 02 Oct	Air France
02 Sep - 06 Sep	Lufthansa
02 Sep - 11 Sep	Lufthansa
07 Sep - 14 Sep	Lufthansa
01 Sep - 06 Sep	Lufthansa
25 Sep - 02 Oct	Air France
23 Sep - 03 Oct	Air France
25 Sep - 03 Oct	Air France
21 Sep - 03 Oct	KLM
27 Sep - 07 Oct	Finnair
27 Sep - 14 Oct	Finnair
30 Sep - 30 Oct	Finnair
20 Sep - 07 Oct	Vietnam Airlines
23 Sep - 06 Oct	Air France

Also check the deals for one-way flights from Seoul to Lisbon 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 Seoul to Lisbon in September from 602€

Return flights