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

Return flights

24 Sep - 14 Oct	Thai AirAsia
29 Sep - 01 Oct	Thai AirAsia
30 Sep - 07 Oct	Thai AirAsia
27 Sep - 07 Oct	Thai AirAsia
27 Sep - 04 Oct	Thai AirAsia
16 Sep - 19 Sep	IndiGo
26 Sep - 02 Oct	Thai AirAsia
16 Sep - 23 Sep	Thai AirAsia
16 Sep - 21 Sep	IndiGo
12 Sep - 16 Sep	Thai AirAsia
29 Sep - 08 Oct	Thai Airways
26 Sep - 07 Oct	China Southern
28 Sep - 07 Oct	China Southern
16 Sep - 29 Sep	IndiGo
19 Sep - 04 Oct	Thai AirAsia
10 Sep - 17 Sep	Thai Airways
16 Sep - 26 Sep	Thai Airways

Also check the deals for one-way flights from Kathmandu 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 Kathmandu to Hanoi in September from $414

Return flights