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

Return flights

19 Aug - 24 Aug	Korean Air
19 Aug - 26 Aug	Air China
08 Aug - 16 Aug	Air China
14 Aug - 16 Aug	Air China
03 Aug - 08 Aug	Air China
15 Aug - 19 Aug	Air China
14 Aug - 18 Aug	Air China
14 Aug - 19 Aug	Air China
07 Aug - 09 Aug	Air China
01 Aug - 08 Aug	Air China
28 Aug - 03 Sep	Air China
28 Aug - 01 Sep	Air China
29 Aug - 06 Sep	Air China

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

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 August from $490

Return flights