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

Return flights

22 Sep - 29 Sep	IndiGo
18 Sep - 25 Sep	IndiGo
24 Sep - 01 Oct	IndiGo
17 Sep - 20 Sep	Air Arabia
16 Sep - 02 Oct	IndiGo
24 Sep - 30 Sep	IndiGo
28 Sep - 15 Oct	IndiGo
30 Sep - 04 Oct	IndiGo
21 Sep - 30 Sep	AirAsia
30 Sep - 13 Oct	IndiGo
30 Sep - 14 Oct	Thai VietJet Air
18 Sep - 15 Oct	Thai AirAsia
18 Sep - 04 Oct	Air Arabia
20 Sep - 03 Oct	Etihad Airways
30 Sep - 07 Oct	Emirates

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 504€

Return flights