AirHint found the following cheapest return flights from Seoul (ICN) to Porto (OPO) in September 2026 (see full year).

Return flights

15 Sep - 22 Sep	Lufthansa
03 Sep - 17 Sep	Lufthansa
01 Sep - 15 Sep	Lufthansa
18 Sep - 23 Sep	Philippine Airlines
01 Sep - 08 Sep	Lufthansa
09 Sep - 16 Sep	Lufthansa
07 Sep - 14 Sep	Lufthansa
14 Sep - 23 Sep	Lufthansa
23 Sep - 29 Sep	Air France
03 Sep - 13 Sep	Lufthansa
30 Sep - 04 Oct	Etihad Airways
30 Sep - 30 Oct	LOT
23 Sep - 03 Oct	Air France
23 Sep - 04 Oct	Air France
24 Sep - 11 Oct	LOT
25 Sep - 02 Oct	Air France
25 Sep - 03 Oct	Air France
24 Sep - 04 Oct	KLM

Also check the deals for one-way flights from Seoul to Porto 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 Porto in September from $692

Return flights