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

Return flights

20 Oct - 27 Oct	Air China
21 Oct - 25 Nov	Lufthansa
13 Oct - 17 Nov	SWISS
21 Oct - 28 Oct	Air France
21 Oct - 29 Oct	Air France
28 Oct - 11 Nov	Lufthansa
20 Oct - 29 Oct	Air France
23 Oct - 29 Oct	Air France
16 Oct - 28 Oct	Air France
16 Oct - 29 Oct	Air France
22 Oct - 28 Oct	Air France
24 Oct - 26 Nov	Air France
23 Oct - 06 Nov	Air France
22 Oct - 29 Oct	Air France
20 Oct - 28 Oct	Air France
22 Oct - 10 Nov	Lufthansa
22 Oct - 03 Nov	Air China
22 Oct - 09 Nov	Air France
30 Oct - 05 Nov	KLM
24 Oct - 05 Nov	Air France

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 574€

Return flights