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

Return flights

11 Sep - 14 Sep	VietJet Air	direct
08 Sep - 15 Sep	VietJet Air	direct
16 Sep - 19 Sep	VietJet Air	direct
13 Sep - 17 Sep	VietJet Air
13 Sep - 15 Sep	VietJet Air
15 Sep - 22 Sep	VietJet Air
13 Sep - 16 Sep	VietJet Air
23 Sep - 26 Sep	VietJet Air
18 Sep - 23 Sep	VietJet Air
06 Sep - 11 Sep	VietJet Air
30 Sep - 05 Oct	VietJet Air
30 Sep - 13 Oct	VietJet Air
30 Sep - 12 Oct	VietJet Air	direct

Also check the deals for one-way flights from Seoul to Haiphong in September.

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 Haiphong in September from $115

Return flights