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

Return flights

01 Dec - 15 Dec	Air China
01 Dec - 23 Dec	Air China
01 Dec - 10 Dec	Air China
03 Dec - 23 Dec	Air China
02 Dec - 31 Jan	Air China
28 Dec - 30 Jan	Air China
26 Dec - 04 Jan	Air China
03 Dec - 22 Dec	Air China
29 Dec - 30 Jan	Shenzhen Airlines
01 Dec - 22 Dec	China Southern
05 Dec - 10 Jan	Lufthansa
08 Dec - 15 Jan	Etihad Airways
26 Dec - 08 Jan	Air China
26 Dec - 17 Jan	Turkish Airlines
29 Dec - 12 Jan	Etihad Airways
10 Dec - 17 Dec	Lufthansa
15 Dec - 29 Dec	Lufthansa
30 Dec - 11 Jan	China Southern
15 Dec - 27 Dec	Lufthansa
16 Dec - 30 Dec	Lufthansa

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 432€

Return flights