AirHint found the following cheapest return flights from Seoul (GMP) to Lisbon (LIS) in September 2026 (see full year).

Return flights

11 Sep - 20 Sep	EVA Air
18 Sep - 27 Sep	EVA Air
19 Sep - 28 Sep	EVA Air
12 Sep - 23 Sep	EVA Air
06 Sep - 20 Sep	Korean Air
05 Sep - 13 Sep	EVA Air
12 Sep - 19 Sep	Japan Airlines
06 Sep - 13 Sep	Japan Airlines
20 Sep - 26 Sep	Japan Airlines
20 Sep - 27 Sep	Japan Airlines
10 Sep - 13 Oct	Japan Airlines
09 Sep - 13 Oct	Japan Airlines
09 Sep - 11 Oct	Japan Airlines
13 Sep - 14 Oct	Japan Airlines
15 Sep - 07 Oct	Japan Airlines
27 Sep - 04 Oct	Japan Airlines
30 Sep - 07 Oct	Japan Airlines
30 Sep - 11 Oct	Japan Airlines
23 Sep - 04 Oct	Japan Airlines
22 Sep - 03 Oct	Japan Airlines

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

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 September from 1717€

Return flights