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

Return flights

19 Sep - 01 Oct	Air China
10 Sep - 17 Sep	China Eastern
18 Sep - 30 Sep	China Eastern
16 Sep - 22 Sep	LOT
22 Sep - 21 Oct	LOT
22 Sep - 22 Oct	LOT
08 Sep - 23 Sep	SWISS
19 Sep - 28 Sep	Air China
22 Sep - 30 Sep	LOT
16 Sep - 30 Sep	LOT
09 Sep - 30 Sep	Air France
14 Sep - 17 Sep	Batik Air Malaysia
23 Sep - 21 Oct	LOT
10 Sep - 14 Sep	China Eastern
22 Sep - 03 Oct	LOT
19 Sep - 02 Oct	Air France
24 Sep - 02 Oct	Air France
27 Sep - 04 Oct	Eastar Jet
16 Sep - 02 Oct	Air France
23 Sep - 03 Oct	LOT

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 678€

Return flights