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

Return flights

28 Aug - 15 Sep	Finnair
05 Aug - 12 Aug	Ryanair
27 Aug - 30 Aug	Ryanair
27 Aug - 07 Sep	Finnair
14 Aug - 19 Aug	Ryanair
13 Aug - 19 Aug	Etihad Airways
29 Aug - 05 Sep	Air France
12 Aug - 19 Aug	Etihad Airways
16 Aug - 22 Aug	Iberia
31 Aug - 17 Sep	SWISS
18 Aug - 25 Aug	Finnair
30 Aug - 14 Sep	Finnair
08 Aug - 15 Aug	TAP
31 Aug - 03 Sep	Etihad Airways
04 Aug - 11 Aug	easyJet
04 Aug - 18 Aug	easyJet
24 Aug - 08 Sep	Finnair
31 Aug - 19 Sep	SWISS
31 Aug - 07 Sep	Finnair
31 Aug - 19 Sep	Korean Air	direct

Also check the deals for one-way flights from Lisbon to Seoul 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 Lisbon to Seoul in August from $853

Return flights