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

Return flights

19 Aug - 26 Aug	Etihad Airways
18 Aug - 25 Aug	Ryanair
11 Aug - 18 Aug	Ryanair
26 Aug - 09 Sep	Air Europa
27 Aug - 07 Sep	Ryanair
31 Aug - 19 Sep	Wizz Air
25 Aug - 28 Aug	TAP
27 Aug - 10 Sep	KLM
31 Aug - 07 Sep	easyJet
26 Aug - 11 Sep	Air Europa
11 Aug - 27 Aug	Ryanair
27 Aug - 28 Sep	Aegean Airlines
24 Aug - 07 Sep	easyJet
26 Aug - 10 Sep	Ryanair
22 Aug - 06 Sep	TAP
20 Aug - 27 Aug	TAP
19 Aug - 28 Aug	TAP
23 Aug - 28 Aug	TAP
18 Aug - 27 Aug	TAP
23 Aug - 27 Aug	TAP

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 676€

Return flights