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

Return flights

26 Sep - 14 Oct	Air China
26 Sep - 16 Oct	Air China
29 Sep - 12 Oct	China Eastern
30 Sep - 13 Oct	China Eastern
22 Sep - 06 Oct	China Eastern
24 Sep - 12 Oct	Air China
29 Sep - 19 Oct	China Eastern
29 Sep - 20 Oct	China Eastern
22 Sep - 13 Oct	China Eastern
30 Sep - 27 Oct	China Eastern
22 Sep - 27 Sep	Air China
22 Sep - 30 Sep	China Eastern
23 Sep - 30 Sep	Wizz Air UK
23 Sep - 29 Sep	Wizz Air UK
24 Sep - 29 Sep	Wizz Air UK
20 Sep - 30 Sep	Wizz Air UK
22 Sep - 29 Sep	Wizz Air UK
25 Sep - 28 Sep	Wizz Air UK
24 Sep - 28 Sep	Wizz Air UK
23 Sep - 28 Sep	Wizz Air UK

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 $555

Return flights