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

Return flights

12 Sep - 11 Oct	Air China
18 Sep - 03 Oct	Air China
12 Sep - 12 Oct	China Southern
25 Sep - 09 Oct	China Southern
25 Sep - 16 Oct	China Southern
12 Sep - 14 Oct	Air China
15 Sep - 15 Oct	Air China
19 Sep - 05 Oct	China Eastern
30 Sep - 07 Oct	China Eastern
30 Sep - 08 Oct	China Eastern
15 Sep - 23 Sep	Air China
16 Sep - 23 Sep	Air China
12 Sep - 25 Sep	Air China
02 Sep - 10 Sep	Air China
17 Sep - 24 Sep	Wizz Air Malta
16 Sep - 24 Sep	Ethiopian Airlines
02 Sep - 12 Sep	China Eastern
15 Sep - 22 Sep	Air China
14 Sep - 21 Sep	Air China
15 Sep - 25 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 $488

Return flights