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

Return flights

16 Sep - 14 Oct	Korean Air
12 Sep - 20 Sep	Japan Airlines
15 Sep - 27 Sep	Japan Airlines
17 Sep - 20 Sep	Japan Airlines
13 Sep - 20 Sep	Japan Airlines
11 Sep - 20 Sep	Japan Airlines
24 Sep - 05 Oct	Japan Airlines
24 Sep - 19 Oct	Japan Airlines
17 Sep - 15 Oct	Japan Airlines
17 Sep - 14 Oct	Japan Airlines
17 Sep - 13 Oct	Japan Airlines
22 Sep - 13 Oct	Japan Airlines
26 Sep - 05 Oct	Japan Airlines
30 Sep - 13 Oct	Japan Airlines
19 Sep - 05 Oct	Japan Airlines
12 Sep - 21 Sep	Japan Airlines
24 Sep - 28 Sep	Japan Airlines
12 Sep - 17 Sep	Japan Airlines
12 Sep - 22 Sep	Japan Airlines
12 Sep - 23 Sep	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 $1527

Return flights