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

Return flights

05 Aug - 19 Aug	KLM
07 Aug - 19 Aug	Air France
13 Aug - 28 Aug	Emirates
26 Aug - 09 Sep	Lufthansa
19 Aug - 26 Aug	Air China
15 Aug - 24 Aug	China Eastern
08 Aug - 19 Aug	Air France
12 Aug - 19 Aug	KLM
13 Aug - 27 Aug	Emirates
18 Aug - 26 Aug	Emirates
13 Aug - 21 Aug	Emirates
29 Aug - 05 Sep	China Southern
30 Aug - 05 Sep	T'way Air
27 Aug - 09 Sep	SWISS
27 Aug - 17 Sep	SWISS
18 Aug - 18 Sep	Lufthansa
25 Aug - 02 Sep	Emirates
27 Aug - 10 Sep	LOT
23 Aug - 01 Sep	LOT
30 Aug - 07 Sep	T'way Air

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 666€

Return flights