AirHint found the following cheapest return flights from London (LHR) to Phnom-penh (PNH) in January 2026 (see full year).

Return flights

19 Jan - 26 Jan	Air China
21 Jan - 10 Feb	Air China
17 Jan - 31 Jan	China Southern
06 Jan - 20 Jan	China Southern
16 Jan - 27 Jan	China Southern
22 Jan - 06 Feb	China Southern
12 Jan - 24 Jan	China Southern
14 Jan - 04 Feb	China Southern
05 Jan - 03 Feb	China Southern
21 Jan - 05 Feb	China Southern
02 Jan - 16 Jan	Etihad Airways
07 Jan - 15 Jan	Etihad Airways
05 Jan - 12 Jan	Etihad Airways
29 Jan - 06 Feb	Singapore Airlines
26 Jan - 09 Feb	China Southern
12 Jan - 03 Feb	British Airways
31 Jan - 14 Feb	China Southern

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

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 January from $669

Return flights