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

Return flights

20 Aug - 29 Aug	Turkish Airlines
27 Aug - 11 Sep	Air France
24 Aug - 09 Sep	KLM
18 Aug - 31 Aug	easyJet
18 Aug - 22 Aug	easyJet
13 Aug - 17 Aug	KLM
18 Aug - 21 Aug	easyJet
16 Aug - 22 Aug	Wizz Air
20 Aug - 28 Aug	KLM
04 Aug - 09 Aug	Wizz Air
04 Aug - 17 Aug	KLM
22 Aug - 03 Sep	Turkish Airlines
08 Aug - 30 Aug	easyJet
22 Aug - 04 Sep	Turkish Airlines
21 Aug - 05 Sep	Turkish Airlines
22 Aug - 05 Sep	Turkish Airlines
22 Aug - 06 Sep	Turkish Airlines
23 Aug - 06 Sep	Turkish Airlines

Also check the deals for one-way flights from Basel 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 Basel to Seoul in August from 712€

Return flights