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

Return flights

11 Aug - 20 Aug	Lufthansa
01 Aug - 13 Aug	Lufthansa
08 Aug - 14 Aug	Air France
26 Aug - 30 Aug	Finnair
26 Aug - 06 Sep	Finnair
19 Aug - 30 Aug	Finnair
17 Aug - 31 Aug	SWISS
12 Aug - 23 Aug	Finnair
19 Aug - 31 Aug	Lufthansa
05 Aug - 16 Aug	Lufthansa
23 Aug - 30 Aug	Finnair
30 Aug - 09 Sep	Finnair
24 Aug - 02 Sep	SWISS
21 Aug - 02 Sep	Finnair
29 Aug - 09 Sep	Lufthansa
22 Aug - 02 Sep	Finnair
26 Aug - 06 Sep	Korean Air	direct
21 Aug - 02 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 678€

Return flights