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

Return flights

20 Jan - 24 Jan	Air China
08 Jan - 14 Jan	Air China
06 Jan - 20 Jan	Air China
19 Jan - 26 Jan	Air China
06 Jan - 09 Jan	Air China
20 Jan - 25 Jan	Air China
13 Jan - 17 Jan	Air China
11 Jan - 16 Jan	Air China
06 Jan - 12 Jan	Air China
09 Jan - 12 Jan	Air China
26 Jan - 02 Feb	Air China
29 Jan - 02 Feb	Air China
30 Jan - 03 Feb	Air China
15 Jan - 15 Feb	Air China
31 Jan - 03 Feb	Air China
28 Jan - 02 Feb	Air China
22 Jan - 16 Feb	Air China
31 Jan - 07 Feb	Air China
10 Jan - 07 Feb	Air China
14 Jan - 11 Feb	Air China

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 438€

Return flights