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

Return flights

30 May - 02 Jun	Jeju Air
27 May - 11 Jun	Jeju Air
09 May - 21 May	Jeju Air
24 May - 02 Jun	Jeju Air
17 May - 21 May	Jeju Air
29 May - 02 Jun	Jeju Air
08 May - 21 May	Jeju Air
30 May - 06 Jun	Jeju Air
16 May - 19 May	Jeju Air
21 May - 30 May	Jeju Air
24 May - 28 May	Jeju Air
21 May - 23 May	Jeju Air
29 May - 06 Jun	Jeju Air
16 May - 30 May	Jeju Air
26 May - 30 May	Jeju Air
15 May - 19 May	Jeju Air
28 May - 04 Jun	Jeju Air
30 May - 03 Jun	Air China
30 May - 07 Jun	Jeju Air
29 May - 03 Jun	Air China

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

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 May from 282€

Return flights