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

Return flights

17 Sep - 21 Sep	Air France
16 Sep - 22 Sep	SWISS
11 Sep - 25 Sep	SWISS
24 Sep - 01 Oct	SWISS
16 Sep - 25 Sep	SWISS
16 Sep - 24 Sep	SWISS
16 Sep - 23 Sep	SWISS
15 Sep - 24 Sep	SWISS
10 Sep - 25 Sep	SWISS
10 Sep - 17 Sep	SWISS
09 Sep - 24 Sep	SWISS
24 Sep - 02 Oct	SWISS
07 Sep - 26 Oct	Hainan Airlines
21 Sep - 04 Oct	Hainan Airlines
16 Sep - 16 Oct	Hainan Airlines
16 Sep - 01 Oct	SWISS
18 Sep - 01 Oct	Hainan Airlines
25 Sep - 13 Oct	Hainan Airlines
11 Sep - 15 Oct	Hainan Airlines
16 Sep - 02 Oct	SWISS

Also check the deals for one-way flights from Hong Kong to London 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 Hong Kong to London in September from 487€

Return flights