AirHint found the following cheapest return flights from Seoul (ICN) to Nha Trang (CXR) in December 2025 (see full year).

Return flights

11 Dec - 14 Dec	Vietnam Airlines
09 Dec - 17 Dec	VietJet Air
09 Dec - 22 Dec	VietJet Air
07 Dec - 14 Dec	VietJet Air
08 Dec - 15 Dec	VietJet Air
16 Dec - 24 Dec	VietJet Air
07 Dec - 12 Dec	VietJet Air
08 Dec - 12 Dec	VietJet Air
02 Dec - 08 Dec	VietJet Air
16 Dec - 21 Dec	VietJet Air
10 Dec - 10 Jan	China Southern
15 Dec - 15 Jan	VietJet Air
31 Dec - 07 Jan	VietJet Air
30 Dec - 02 Jan	VietJet Air
30 Dec - 04 Jan	VietJet Air
29 Dec - 09 Jan	VietJet Air
21 Dec - 04 Jan	VietJet Air
18 Dec - 03 Jan	VietJet Air
31 Dec - 02 Jan	VietJet Air
31 Dec - 04 Jan	VietJet Air

Also check the deals for one-way flights from Seoul to Nha Trang in December.

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 Nha Trang in December from $223

Return flights