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

Return flights

16 Sep - 07 Oct	British Airways
07 Sep - 07 Oct	British Airways
02 Sep - 16 Sep	British Airways
04 Sep - 14 Sep	British Airways
09 Sep - 07 Oct	SWISS
01 Sep - 15 Sep	British Airways
07 Sep - 16 Sep	British Airways
10 Sep - 14 Sep	British Airways
23 Sep - 25 Oct	British Airways
08 Sep - 06 Oct	British Airways
21 Sep - 12 Oct	British Airways
09 Sep - 16 Sep	British Airways
07 Sep - 28 Sep	SWISS
09 Sep - 23 Sep	SWISS
01 Sep - 22 Sep	SWISS
13 Sep - 30 Sep	SWISS
16 Sep - 04 Oct	SWISS
20 Sep - 07 Oct	SWISS
20 Sep - 04 Oct	SWISS
30 Sep - 05 Oct	SWISS

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 840€

Return flights