AirHint found the following cheapest return flights from Sofia (SOF) to Seoul (ICN) in August 2025 (see full year).

Return flights

26 Aug - 11 Sep	Turkish Airlines
25 Aug - 31 Aug	Turkish Airlines
26 Aug - 12 Sep	LOT
20 Aug - 25 Aug	Turkish Airlines
25 Aug - 07 Sep	Turkish Airlines
25 Aug - 12 Sep	Turkish Airlines
13 Aug - 20 Aug	Turkish Airlines
14 Aug - 20 Aug	Turkish Airlines
07 Aug - 25 Aug	Turkish Airlines
17 Aug - 21 Aug	Ryanair
25 Aug - 16 Sep	Emirates
25 Aug - 04 Sep	LOT
06 Aug - 17 Aug	Pegasus Airlines
25 Aug - 03 Sep	LOT
15 Aug - 22 Aug	Turkish Airlines
15 Aug - 20 Aug	Ryanair
15 Aug - 21 Aug	Turkish Airlines

Also check the deals for one-way flights from Sofia to Seoul in August.

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 Sofia to Seoul in August from 651€

Return flights