Cheapest return flights from London to Phnom-penh in December from $663

Best time to book flights for London (LHR) to Phnom-penh (PNH) flights at AirHint

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

Return flights

04 Dec - 11 Dec Air China
02 Dec - 09 Dec Air China
01 Dec - 12 Dec Air China
01 Dec - 07 Dec Air China
31 Dec - 07 Jan Air China
28 Dec - 20 Jan Air China
24 Dec - 08 Jan China Airlines
09 Dec - 14 Dec British Airways
06 Dec - 27 Dec Air China
08 Dec - 13 Dec Vietnam Airlines
26 Dec - 17 Jan Air China
10 Dec - 31 Dec Vietnam Airlines
24 Dec - 31 Dec Air China
26 Dec - 04 Jan Cathay Pacific
22 Dec - 17 Jan Air China
16 Dec - 15 Jan Singapore Airlines
06 Dec - 03 Jan British Airways
24 Dec - 03 Jan Cathay Pacific
26 Dec - 06 Jan Singapore Airlines

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

Skyscanner

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.

Book a cheap hotel in Phnom-penh

Cheap car rent in Phnom-penh