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

Return flights

12 Aug - 16 Sep	Lufthansa
29 Aug - 06 Sep	China Southern
19 Aug - 29 Aug	Lufthansa
06 Aug - 03 Sep	Air France
26 Aug - 03 Sep	Etihad Airways
27 Aug - 31 Aug	Etihad Airways
20 Aug - 03 Sep	Lufthansa
25 Aug - 01 Sep	Lufthansa
26 Aug - 23 Sep	Lufthansa
26 Aug - 09 Sep	Lufthansa
25 Aug - 09 Sep	Lufthansa
19 Aug - 26 Aug	LOT
03 Aug - 20 Aug	KLM
18 Aug - 26 Aug	Emirates
13 Aug - 20 Aug	Turkish Airlines
13 Aug - 27 Aug	Turkish Airlines
26 Aug - 01 Sep	Lufthansa
05 Aug - 21 Aug	KLM
18 Aug - 27 Aug	Emirates
18 Aug - 28 Aug	Emirates

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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest return flights from Seoul to Lisbon in August from $731

Return flights