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

Return flights

27 Aug - 02 Sep	SWISS
22 Aug - 25 Aug	Asiana Airlines
27 Aug - 17 Sep	SWISS
20 Aug - 27 Aug	Emirates
18 Aug - 28 Aug	Emirates
18 Aug - 03 Sep	Emirates
25 Aug - 09 Sep	Emirates
18 Aug - 27 Aug	Emirates
20 Aug - 26 Aug	Emirates
19 Aug - 27 Aug	Emirates
19 Aug - 28 Aug	Emirates
19 Aug - 26 Aug	Emirates
11 Aug - 19 Aug	Emirates
25 Aug - 28 Aug	Etihad Airways
25 Aug - 07 Sep	Etihad Airways
25 Aug - 04 Sep	Etihad Airways
26 Aug - 02 Sep	Etihad Airways
26 Aug - 04 Sep	Etihad Airways
25 Aug - 02 Sep	Etihad Airways
27 Aug - 24 Sep	SWISS

Also check the deals for one-way flights from Seoul to Lisbon in August.

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 August from 592€

Return flights