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

Return flights

05 Dec - 14 Dec	China Southern
05 Dec - 24 Dec	China Southern
01 Dec - 28 Dec	Vueling Airlines
01 Dec - 10 Dec	easyJet
02 Dec - 10 Dec	China Southern
01 Dec - 08 Dec	Vueling Airlines
03 Dec - 10 Dec	Vueling Airlines
09 Dec - 09 Jan	easyJet
26 Dec - 10 Jan	easyJet
10 Dec - 08 Jan	easyJet
03 Dec - 27 Dec	Singapore Airlines
14 Dec - 30 Dec	Wizz Air UK
25 Dec - 22 Jan	China Southern
01 Dec - 30 Jan	easyJet
14 Dec - 10 Jan	Wizz Air UK
15 Dec - 31 Dec	Vueling Airlines
25 Dec - 08 Jan	China Southern
01 Dec - 02 Jan	Vueling Airlines
01 Dec - 07 Jan	easyJet
29 Dec - 12 Jan	easyJet

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 551€

Return flights