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

Return flights

24 Sep - 03 Oct	Thai AirAsia
19 Sep - 03 Oct	Thai AirAsia
29 Sep - 03 Oct	Thai AirAsia
24 Sep - 05 Oct	Thai AirAsia
19 Sep - 05 Oct	Thai AirAsia
29 Sep - 05 Oct	Thai AirAsia
10 Sep - 12 Sep	Thai AirAsia
15 Sep - 03 Oct	Thai AirAsia
15 Sep - 05 Oct	Thai AirAsia
05 Sep - 12 Sep	Thai AirAsia
28 Sep - 05 Oct	IndiGo
27 Sep - 03 Oct	AirAsia
04 Sep - 12 Sep	AirAsia
06 Sep - 12 Sep	AirAsia
06 Sep - 11 Sep	IndiGo
09 Sep - 13 Sep	IndiGo

Also check the deals for one-way flights from Lucknow 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 Lucknow to Hanoi in September from 262€

Return flights