AirHint found the following cheapest return flights from London (LCY) to Beijing (PEK) in September 2025 (see full year).

Return flights

30 Sep - 07 Oct	KLM
28 Sep - 05 Oct	KLM
22 Sep - 10 Oct	KLM
26 Sep - 05 Oct	KLM
27 Sep - 12 Oct	KLM
27 Sep - 11 Oct	KLM
24 Sep - 15 Oct	KLM
22 Sep - 24 Oct	KLM
27 Sep - 10 Oct	KLM
29 Sep - 14 Oct	KLM
03 Sep - 10 Sep	KLM
08 Sep - 16 Sep	KLM
01 Sep - 10 Sep	KLM
07 Sep - 18 Sep	KLM
04 Sep - 18 Sep	KLM
01 Sep - 05 Sep	KLM
01 Sep - 07 Sep	KLM
15 Sep - 24 Sep	KLM
05 Sep - 09 Sep	KLM
10 Sep - 16 Sep	KLM

Also check the deals for one-way flights from London to Beijing 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 Beijing in September from 557€

Return flights