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

Return flights

01 Sep - 08 Sep	Ryanair
21 Sep - 12 Oct	easyJet
05 Sep - 19 Sep	TAP
25 Sep - 12 Oct	Etihad Airways
28 Sep - 15 Oct	Etihad Airways
30 Sep - 28 Oct	Lufthansa
12 Sep - 22 Sep	TAP
28 Sep - 08 Oct	Etihad Airways
25 Sep - 29 Oct	Ryanair
07 Sep - 18 Sep	Air France
01 Sep - 16 Sep	Ryanair
14 Sep - 22 Sep	easyJet
30 Sep - 30 Oct	Lufthansa
30 Sep - 29 Oct	Lufthansa
01 Sep - 22 Sep	TAP
17 Sep - 01 Oct	easyJet
10 Sep - 17 Sep	Finnair
10 Sep - 22 Sep	easyJet
14 Sep - 21 Sep	easyJet
24 Sep - 28 Oct	Air France

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 636€

Return flights