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

Return flights

03 Dec - 24 Dec	Air China
03 Dec - 17 Dec	Air China
01 Dec - 30 Jan	Air China
05 Dec - 23 Dec	Shenzhen Airlines
01 Dec - 14 Dec	Shenzhen Airlines
05 Dec - 22 Dec	Lufthansa
05 Dec - 24 Dec	Lufthansa
29 Dec - 23 Jan	Lufthansa
30 Dec - 25 Jan	Air China
26 Dec - 20 Jan	Air China
24 Dec - 22 Jan	China Southern
12 Dec - 23 Dec	Lufthansa
28 Dec - 15 Jan	Shenzhen Airlines
29 Dec - 10 Jan	China Southern
25 Dec - 11 Jan	China Southern
09 Dec - 09 Jan	China Southern
25 Dec - 07 Jan	China Southern
21 Dec - 28 Dec	Air China
16 Dec - 30 Dec	Lufthansa
15 Dec - 27 Dec	Shenzhen Airlines

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 $530

Return flights