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

Return flights

26 Aug - 04 Sep	SWISS
31 Aug - 15 Sep	SWISS
31 Aug - 14 Sep	SWISS
31 Aug - 11 Sep	SWISS
31 Aug - 10 Sep	SWISS
31 Aug - 19 Sep	Air India
26 Aug - 11 Sep	SWISS
24 Aug - 14 Sep	SWISS
25 Aug - 15 Sep	SWISS
24 Aug - 15 Sep	SWISS
05 Aug - 12 Aug	Air India
21 Aug - 24 Aug	Finnair
20 Aug - 27 Aug	Finnair
10 Aug - 17 Aug	Air India
18 Aug - 25 Aug	Finnair
05 Aug - 13 Aug	Air India
21 Aug - 28 Aug	Air India
23 Aug - 31 Aug	Finnair
06 Aug - 27 Aug	Air India
06 Aug - 13 Aug	Air India

Also check the deals for one-way flights from Paris 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 Paris to Seoul in August from 571€

Return flights