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

Return flights

26 Aug - 02 Sep	SWISS
16 Aug - 26 Aug	KLM
12 Aug - 23 Aug	KLM
26 Aug - 06 Sep	Finnair
12 Aug - 19 Aug	KLM
16 Aug - 23 Aug	KLM
02 Aug - 07 Aug	KLM
17 Aug - 28 Aug	LOT
18 Aug - 28 Aug	Air France
19 Aug - 23 Aug	LOT
19 Aug - 26 Aug	LOT
25 Aug - 05 Sep	LOT
12 Aug - 21 Aug	KLM
24 Aug - 03 Sep	Finnair
30 Aug - 06 Sep	Finnair
28 Aug - 06 Sep	Finnair
30 Aug - 09 Sep	Finnair
29 Aug - 05 Sep	LOT
23 Aug - 02 Sep	LOT
23 Aug - 04 Sep	LOT

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 $905

Return flights