AirHint found the following cheapest one-way flights from Seoul (GMP) to Lisbon (LIS) in October 2025 (see full year).

One-Way flights

12 Oct	Air China
16 Oct	Japan Airlines
10 Oct	Japan Airlines
03 Oct	Air China
27 Oct	Japan Airlines
23 Oct	Japan Airlines
09 Oct	Japan Airlines
31 Oct	Japan Airlines
07 Oct	Japan Airlines
06 Oct	Japan Airlines

Also check the deals for return 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 one-way flights from Seoul to Lisbon in October from $555

One-Way flights