AirHint found the following cheapest return flights from Dublin (DUB) to Hanoi (HAN) in September 2025 (see full year).

Return flights

27 Sep - 11 Oct	Aer Lingus
10 Sep - 01 Oct	Etihad Airways
10 Sep - 24 Sep	Ryanair
22 Sep - 29 Sep	Etihad Airways
22 Sep - 06 Oct	Etihad Airways
10 Sep - 17 Sep	Ryanair
09 Sep - 07 Oct	Etihad Airways
09 Sep - 23 Sep	Aer Lingus
03 Sep - 17 Sep	Aer Lingus
11 Sep - 24 Sep	Aer Lingus
03 Sep - 10 Sep	Aer Lingus
20 Sep - 30 Sep	Aer Lingus
06 Sep - 16 Sep	Etihad Airways
08 Sep - 22 Sep	Etihad Airways
12 Sep - 03 Oct	Ryanair
20 Sep - 24 Oct	Ryanair
27 Sep - 29 Oct	Ryanair
07 Sep - 18 Oct	Hainan Airlines
24 Sep - 08 Oct	Aer Lingus
21 Sep - 10 Oct	Emirates

Also check the deals for one-way flights from Dublin to Hanoi 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 Dublin to Hanoi in September from 620€

Return flights