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

Return flights

02 Sep - 09 Sep	Air China
03 Sep - 09 Sep	Air China
02 Sep - 07 Sep	Air China
03 Sep - 08 Sep	Air China
10 Sep - 22 Oct	Air China
10 Sep - 15 Oct	Air China
22 Sep - 16 Oct	Air China
02 Sep - 15 Oct	Air China
02 Sep - 08 Sep	Air China
17 Sep - 23 Oct	Air China
21 Sep - 12 Oct	Air China
24 Sep - 19 Oct	Air China
05 Sep - 08 Sep	Air China
06 Sep - 27 Sep	Air China
15 Sep - 21 Oct	Air China
24 Sep - 13 Oct	Air China
24 Sep - 12 Oct	Air China
16 Sep - 19 Sep	Air China
14 Sep - 29 Sep	Air China
08 Sep - 21 Sep	Air China

Also check the deals for one-way flights from London 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 London to Hanoi in September from 377€

Return flights