AirHint found the following cheapest return flights from Seoul (GMP) to Hanoi (HAN) in October 2025 (see full year).

Return flights

17 Oct - 21 Oct	EVA Air
18 Oct - 21 Oct	EVA Air
29 Oct - 04 Nov	EVA Air
24 Oct - 27 Oct	Air Busan
20 Oct - 31 Oct	Air China
20 Oct - 23 Oct	Air China
23 Oct - 27 Oct	Air China
16 Oct - 21 Oct	Air China
14 Oct - 30 Oct	Air China
27 Oct - 30 Oct	Air China
23 Oct - 26 Oct	Air China
30 Oct - 03 Nov	Air China
29 Oct - 02 Nov	Air China
15 Oct - 15 Nov	Air China
25 Oct - 09 Nov	Air China
29 Oct - 03 Nov	EVA Air
24 Oct - 02 Nov	Air China
31 Oct - 03 Nov	EVA Air
30 Oct - 02 Nov	Air China
26 Oct - 06 Nov	Japan Airlines

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

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 October from 366€

Return flights