AirHint found the following cheapest return flights from Seoul (GMP) to Hanoi (HAN) in January 2026 (see full year).

Return flights

31 Jan - 05 Feb	Jeju Air
31 Jan - 03 Feb	Jeju Air
29 Jan - 05 Feb	Jeju Air
26 Jan - 05 Feb	Jeju Air
28 Jan - 12 Feb	Jeju Air
26 Jan - 29 Jan	Jeju Air
25 Jan - 28 Jan	Eastar Jet
22 Jan - 29 Jan	T'way Air
20 Jan - 29 Jan	Jeju Air
21 Jan - 28 Jan	Eastar Jet
19 Jan - 29 Jan	Jeju Air
21 Jan - 29 Jan	Jeju Air
22 Jan - 27 Jan	T'way Air
20 Jan - 22 Jan	Jeju Air
21 Jan - 24 Jan	Eastar Jet
25 Jan - 25 Feb	Eastar Jet
28 Jan - 04 Feb	Jeju Air
26 Jan - 04 Feb	Jeju Air
26 Jan - 06 Feb	Jeju Air
21 Jan - 04 Feb	Jeju Air

Also check the deals for one-way flights from Seoul to Hanoi in January.

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 Hanoi in January from 207€

Return flights