AirHint found the following cheapest return flights from Phnom-penh (PNH) to Seoul (ICN) in September 2025 (see full year).

Return flights

05 Sep - 06 Sep	China Southern
05 Sep - 08 Sep	Thai VietJet Air
06 Sep - 08 Sep	Thai VietJet Air
07 Sep - 19 Sep	Shenzhen Airlines
06 Sep - 11 Sep	Shenzhen Airlines
07 Sep - 12 Sep	Shenzhen Airlines
05 Sep - 13 Sep	Shenzhen Airlines
05 Sep - 12 Sep	Shenzhen Airlines
07 Sep - 08 Sep	Thai VietJet Air
05 Sep - 17 Sep	Thai VietJet Air

Also check the deals for one-way flights from Phnom-penh to Seoul 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 Phnom-penh to Seoul in September from $351

Return flights