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

Return flights

20 Oct - 13 Nov	Lufthansa
07 Oct - 13 Nov	Lufthansa
21 Oct - 11 Nov	Lufthansa
22 Oct - 12 Nov	Lufthansa
16 Oct - 13 Nov	Lufthansa
14 Oct - 13 Nov	Lufthansa
13 Oct - 13 Nov	Lufthansa
19 Oct - 12 Nov	Lufthansa
07 Oct - 10 Nov	KLM
20 Oct - 06 Nov	Lufthansa

Also check the deals for one-way flights from Seoul to Lisbon in October.

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 October from 591€

Return flights