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

Return flights

02 Sep - 09 Sep	Air China
03 Sep - 15 Oct	Air China
03 Sep - 13 Oct	Air China
21 Sep - 12 Oct	Air China
03 Sep - 08 Sep	Air China
02 Sep - 08 Sep	Air China
21 Sep - 15 Oct	Air China
22 Sep - 16 Oct	Air China
14 Sep - 15 Oct	Air China
22 Sep - 19 Oct	Air China
14 Sep - 19 Oct	Air China
07 Sep - 12 Oct	Air China
10 Sep - 19 Oct	Air China
15 Sep - 26 Sep	Shenzhen Airlines
21 Sep - 30 Sep	Shenzhen Airlines
17 Sep - 30 Sep	Shenzhen Airlines
17 Sep - 25 Sep	Shenzhen Airlines
13 Sep - 25 Sep	Shenzhen Airlines
15 Sep - 25 Sep	Shenzhen Airlines
21 Sep - 26 Sep	Shenzhen Airlines

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 $511

Return flights