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

Return flights

26 Sep - 20 Oct	Ryanair
08 Sep - 13 Oct	TAP
09 Sep - 17 Sep	Ryanair
12 Sep - 20 Sep	Transavia France
24 Sep - 08 Oct	Air France
21 Sep - 29 Sep	Ryanair
18 Sep - 22 Sep	Iberia
13 Sep - 21 Sep	Ryanair
07 Sep - 18 Sep	Vueling Airlines
10 Sep - 17 Sep	Transavia France
14 Sep - 20 Sep	Ryanair
27 Sep - 10 Oct	Iberia
29 Sep - 13 Oct	Wizz Air Malta
17 Sep - 22 Sep	Ryanair
24 Sep - 28 Sep	Ryanair
23 Sep - 07 Oct	Air Europa
18 Sep - 19 Oct	Iberia
26 Sep - 08 Oct	easyJet
20 Sep - 07 Oct	TAP
24 Sep - 01 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 662€

Return flights