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

Return flights

01 Dec - 08 Dec	China Southern
01 Dec - 22 Dec	China Southern
03 Dec - 22 Dec	China Southern
03 Dec - 17 Dec	Air China
01 Dec - 13 Dec	Shenzhen Airlines
05 Dec - 22 Dec	China Southern
01 Dec - 15 Jan	China Southern
29 Dec - 18 Jan	Shenzhen Airlines
28 Dec - 18 Jan	China Southern
31 Dec - 07 Jan	Wizz Air Malta
07 Dec - 14 Dec	China Southern
12 Dec - 29 Dec	Wizz Air Malta
24 Dec - 29 Dec	China Southern
29 Dec - 02 Jan	Shenzhen Airlines
15 Dec - 22 Dec	China Southern
25 Dec - 02 Jan	British Airways
27 Dec - 10 Jan	Cathay Pacific
27 Dec - 03 Jan	Cathay Pacific
18 Dec - 16 Jan	Malaysia Airlines
24 Dec - 04 Jan	China Eastern

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 $552

Return flights