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

Return flights

07 Sep - 15 Sep	AirAsia
07 Sep - 12 Sep	AirAsia
22 Sep - 29 Sep	Oman Air
24 Sep - 01 Oct	AirAsia
02 Sep - 16 Sep	Thai AirAsia
19 Sep - 26 Sep	Oman Air
20 Sep - 27 Sep	Etihad Airways
13 Sep - 27 Sep	Etihad Airways
01 Sep - 09 Sep	Thai VietJet Air
23 Sep - 01 Oct	Oman Air
01 Sep - 14 Sep	Thai AirAsia
30 Sep - 10 Oct	Etihad Airways
10 Sep - 10 Sep	Etihad Airways
01 Sep - 01 Oct	Qatar Airways
25 Sep - 20 Oct	IndiGo

Also check the deals for one-way flights from Phuket 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 Phuket to London in September from 603€

Return flights