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

Return flights

26 Sep - 26 Oct	TAP
24 Sep - 15 Oct	easyJet
29 Sep - 28 Oct	TAP
09 Sep - 16 Sep	easyJet
27 Sep - 29 Oct	TAP
03 Sep - 30 Oct	Etihad Airways
08 Sep - 18 Sep	Ryanair
12 Sep - 22 Sep	Air Europa
07 Sep - 19 Sep	easyJet
10 Sep - 17 Sep	Wizz Air
08 Sep - 20 Sep	Ryanair
25 Sep - 25 Oct	Ryanair
25 Sep - 15 Oct	Ryanair
12 Sep - 24 Sep	TAP
02 Sep - 09 Sep	Ryanair
24 Sep - 08 Oct	Air France
28 Sep - 15 Oct	Etihad Airways
04 Sep - 14 Sep	Vueling Airlines
04 Sep - 07 Sep	Ryanair
20 Sep - 07 Oct	Ryanair

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 619€

Return flights