AirHint found the following cheapest return flights from London (LGW) to Phnom-penh (PNH) in December 2025 (see full year).

Return flights

29 Dec - 18 Jan	Air China
05 Dec - 21 Dec	China Eastern
01 Dec - 30 Jan	China Eastern
02 Dec - 31 Jan	Wizz Air UK
03 Dec - 17 Dec	Air China
01 Dec - 12 Dec	China Eastern
01 Dec - 07 Dec	Wizz Air Malta
01 Dec - 15 Dec	China Eastern
01 Dec - 10 Dec	Wizz Air Malta
08 Dec - 29 Dec	Wizz Air UK
08 Dec - 23 Dec	Wizz Air UK
31 Dec - 14 Jan	Air China
04 Dec - 11 Dec	Vueling Airlines
02 Dec - 11 Jan	Wizz Air UK
30 Dec - 13 Jan	Wizz Air UK
29 Dec - 12 Jan	Wizz Air UK
08 Dec - 09 Jan	Wizz Air UK
24 Dec - 14 Jan	Air China
28 Dec - 12 Jan	Wizz Air UK
19 Dec - 26 Dec	Wizz Air Malta

Also check the deals for one-way flights from London to Phnom-penh in December.

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 Phnom-penh in December from 594€

Return flights