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

Return flights

11 Sep - 21 Sep	EVA Air
11 Sep - 15 Sep	EVA Air
11 Sep - 16 Sep	EVA Air
11 Sep - 20 Sep	EVA Air
12 Sep - 27 Sep	EVA Air
19 Sep - 27 Sep	EVA Air
18 Sep - 27 Sep	EVA Air
25 Sep - 04 Oct	EVA Air
18 Sep - 22 Sep	EVA Air
10 Sep - 15 Sep	Japan Airlines
04 Sep - 13 Sep	EVA Air
18 Sep - 04 Oct	EVA Air
18 Sep - 01 Oct	EVA Air
24 Sep - 02 Oct	Japan Airlines
24 Sep - 01 Oct	Japan Airlines
25 Sep - 02 Oct	Japan Airlines
24 Sep - 03 Oct	Japan Airlines
23 Sep - 04 Oct	Japan Airlines
16 Sep - 04 Oct	Japan Airlines
17 Sep - 05 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 $1487

Return flights