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

Return flights

03 Sep - 09 Sep	Emirates
15 Sep - 21 Oct	Emirates
11 Sep - 15 Sep	China Eastern
20 Sep - 28 Sep	Scandinavian Airlines
19 Sep - 24 Sep	T'way Air
01 Sep - 05 Sep	Emirates
15 Sep - 22 Oct	Lufthansa
15 Sep - 22 Sep	Lufthansa
10 Sep - 14 Sep	LOT
03 Sep - 11 Sep	Emirates
02 Sep - 07 Sep	Lufthansa
15 Sep - 16 Oct	Lufthansa
13 Sep - 20 Sep	LOT
25 Sep - 06 Oct	KLM
24 Sep - 10 Oct	LOT

Also check the deals for one-way flights from Seoul to Bucharest 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 Bucharest in September from $698

Return flights