AirHint found the following cheapest return flights from Haiphong (HPH) to Seoul (ICN) in August 2025 (see full year).

Return flights

30 Aug - 02 Sep	VietJet Air	direct
31 Aug - 17 Sep	VietJet Air
25 Aug - 11 Sep	VietJet Air
16 Aug - 31 Aug	VietJet Air	direct
20 Aug - 27 Aug	VietJet Air
13 Aug - 20 Aug	VietJet Air
24 Aug - 10 Sep	VietJet Air
14 Aug - 26 Aug	VietJet Air
10 Aug - 27 Aug	VietJet Air
15 Aug - 31 Aug	VietJet Air
06 Aug - 13 Aug	VietJet Air
18 Aug - 04 Sep	VietJet Air
06 Aug - 15 Aug	VietJet Air
17 Aug - 03 Sep	VietJet Air
03 Aug - 20 Aug	VietJet Air
03 Aug - 06 Aug	VietJet Air

Also check the deals for one-way flights from Haiphong to Seoul 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 Haiphong to Seoul in August from $264

Return flights