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
24 Sep - 11 Oct	TAP
26 Sep - 08 Oct	SWISS
13 Sep - 21 Sep	Ryanair
13 Sep - 23 Sep	Ryanair
12 Sep - 28 Sep	Transavia France
10 Sep - 22 Sep	Transavia France
24 Sep - 28 Sep	Ryanair
12 Sep - 16 Sep	Transavia France
10 Sep - 17 Sep	Transavia France
14 Sep - 24 Sep	Ryanair
08 Sep - 13 Sep	TAP
21 Sep - 06 Oct	Ryanair
20 Sep - 07 Oct	TAP
24 Sep - 01 Oct	Ryanair
19 Sep - 07 Oct	TAP
21 Sep - 03 Oct	Ryanair
28 Sep - 04 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.

Book a cheap hotel in Seoul

Cheap car rent in Seoul

Cheapest return flights from Lisbon to Seoul in September from $776

Return flights