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

Return flights

23 Sep - 14 Oct	China Eastern
21 Sep - 14 Oct	China Eastern
25 Sep - 10 Oct	Air China
27 Sep - 12 Oct	Air China
11 Sep - 20 Sep	Air China
14 Sep - 23 Sep	Air China
30 Sep - 05 Oct	Air China
30 Sep - 14 Oct	Air China
12 Sep - 04 Oct	Air China
30 Sep - 11 Oct	Air China
28 Sep - 12 Oct	Air China
01 Sep - 16 Sep	Air China
12 Sep - 22 Sep	Air China
12 Sep - 19 Sep	Air China
13 Sep - 20 Sep	Air China
01 Sep - 14 Sep	Air China
01 Sep - 10 Sep	Air China
01 Sep - 15 Sep	Air China
19 Sep - 26 Sep	Air China
23 Sep - 04 Oct	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 527€

Return flights