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

Return flights

29 Oct - 06 Nov	Lufthansa
27 Oct - 05 Nov	Lufthansa
15 Oct - 06 Nov	Lufthansa
21 Oct - 04 Nov	Lufthansa
24 Oct - 04 Nov	Lufthansa
13 Oct - 24 Oct	Air France
08 Oct - 22 Oct	Air France
29 Oct - 07 Nov	Lufthansa
27 Oct - 07 Nov	Lufthansa
29 Oct - 09 Nov	Lufthansa
21 Oct - 30 Oct	Air France
08 Oct - 30 Oct	Air France
10 Oct - 22 Oct	Air France
08 Oct - 07 Nov	LOT
16 Oct - 24 Oct	Air France
13 Oct - 23 Oct	Air France
22 Oct - 29 Oct	LOT
12 Oct - 29 Oct	LOT
25 Oct - 27 Oct	LOT
28 Oct - 03 Nov	LOT

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 $681

Return flights