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

Return flights

29 Sep - 08 Oct	Thai AirAsia X
24 Sep - 01 Oct	Thai AirAsia X
17 Sep - 24 Sep	Vietnam Airlines	direct
23 Sep - 30 Sep	VietJet Air
24 Sep - 26 Sep	Thai AirAsia X
01 Sep - 08 Sep	VietJet Air
15 Sep - 23 Sep	IndiGo
20 Sep - 30 Sep	IndiGo
18 Sep - 23 Sep	IndiGo
21 Sep - 15 Oct	Thai AirAsia X
24 Sep - 27 Sep	Akasa Air
23 Sep - 25 Sep	VietJet Air
01 Sep - 04 Sep	VietJet Air
20 Sep - 14 Oct	Air India
24 Sep - 05 Oct	Thai AirAsia X
26 Sep - 01 Oct	IndiGo
30 Sep - 27 Oct	VietJet Air
28 Sep - 07 Oct	IndiGo
22 Sep - 07 Oct	Akasa Air
27 Sep - 02 Oct	IndiGo

Also check the deals for one-way flights from Delhi 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 Delhi to Hanoi in September from 201€

Return flights