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

Return flights

24 Sep - 23 Oct	Air China
23 Sep - 12 Oct	Air China
17 Sep - 19 Oct	Air China
24 Sep - 15 Oct	Air China
18 Sep - 12 Oct	Air China
14 Sep - 13 Oct	Air China
24 Sep - 19 Oct	Air China
18 Sep - 16 Oct	Air China
17 Sep - 15 Oct	Air China
17 Sep - 12 Oct	Air China
22 Sep - 30 Sep	Air China
10 Sep - 22 Sep	Air China
15 Sep - 27 Sep	Air China
14 Sep - 29 Sep	Air China
15 Sep - 24 Sep	Qatar Airways
17 Sep - 22 Sep	Qatar Airways
18 Sep - 24 Sep	Qatar Airways
17 Sep - 24 Sep	Qatar Airways
15 Sep - 30 Sep	Qatar Airways
15 Sep - 25 Sep	Qatar Airways

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 402€

Return flights