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

Return flights

20 Sep - 27 Sep	KLM
30 Sep - 27 Oct	ITA Airways
15 Sep - 27 Sep	KLM
04 Sep - 10 Sep	ITA Airways
19 Sep - 08 Oct	KLM
22 Sep - 27 Sep	KLM
17 Sep - 01 Oct	KLM
17 Sep - 08 Oct	KLM
16 Sep - 21 Sep	KLM
19 Sep - 05 Oct	KLM
10 Sep - 17 Sep	KLM
11 Sep - 24 Sep	KLM
02 Sep - 07 Oct	KLM
11 Sep - 18 Sep	KLM
24 Sep - 08 Oct	KLM
22 Sep - 08 Oct	KLM
05 Sep - 18 Sep	KLM
21 Sep - 04 Oct	KLM
26 Sep - 01 Oct	KLM
15 Sep - 29 Sep	KLM

Also check the deals for one-way flights from London to Phuket 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 Phuket in September from 711€

Return flights