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

Return flights

01 Sep - 09 Sep	Lufthansa
09 Sep - 16 Sep	Lufthansa
03 Sep - 08 Sep	Lufthansa
01 Sep - 14 Sep	Lufthansa
09 Sep - 14 Sep	Lufthansa
10 Sep - 17 Sep	Lufthansa
14 Sep - 23 Sep	Lufthansa
14 Sep - 21 Sep	Lufthansa
09 Sep - 20 Sep	Lufthansa
17 Sep - 30 Sep	KLM
21 Sep - 03 Oct	KLM
30 Sep - 07 Oct	Finnair
21 Sep - 04 Oct	Etihad Airways
30 Sep - 11 Oct	Finnair
22 Sep - 01 Oct	KLM
28 Sep - 05 Oct	Finnair
23 Sep - 03 Oct	Air France
24 Sep - 03 Oct	Air France
19 Sep - 04 Oct	Vietnam Airlines
27 Sep - 04 Oct	Finnair

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 $721

Return flights