AirHint found the following cheapest return flights from London (LCY) to Hanoi (HAN) in September 2026 (see full year).

Return flights

13 Sep - 30 Sep	SWISS
22 Sep - 06 Oct	British Airways
21 Sep - 05 Oct	British Airways
07 Sep - 14 Sep	British Airways
21 Sep - 07 Oct	British Airways
10 Sep - 24 Sep	British Airways
14 Sep - 21 Sep	British Airways
03 Sep - 20 Sep	British Airways
09 Sep - 21 Sep	British Airways
02 Sep - 24 Sep	British Airways
11 Sep - 21 Sep	British Airways
03 Sep - 17 Sep	SWISS
09 Sep - 23 Sep	British Airways
24 Sep - 04 Oct	British Airways
28 Sep - 07 Oct	British Airways
30 Sep - 18 Oct	British Airways
25 Sep - 05 Oct	KLM
19 Sep - 05 Oct	KLM
27 Sep - 04 Oct	KLM
30 Sep - 10 Oct	British 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 $944

Return flights