AirHint found the following cheapest return flights from Seoul (ICN) to Lisbon (LIS) in August 2026 (see full year).

Return flights

03 Aug - 26 Aug	Lufthansa
25 Aug - 31 Aug	Lufthansa
20 Aug - 31 Aug	Lufthansa
05 Aug - 28 Aug	Lufthansa
31 Aug - 07 Sep	SWISS
03 Aug - 19 Aug	Lufthansa
26 Aug - 30 Aug	Finnair
23 Aug - 27 Aug	Lufthansa
16 Aug - 30 Aug	Finnair
24 Aug - 29 Aug	Finnair
05 Aug - 09 Aug	Lufthansa
26 Aug - 05 Sep	Finnair
30 Aug - 06 Sep	Finnair
23 Aug - 02 Sep	Lufthansa
31 Aug - 06 Sep	SWISS
28 Aug - 11 Sep	Finnair
29 Aug - 04 Sep	Finnair
28 Aug - 04 Sep	Finnair
23 Aug - 02 Sep	Korean Air	direct
28 Aug - 04 Sep	Korean Air	direct

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 $758

Return flights