Cheapest return flights from London to Phnom-penh in September from $856

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 September 2025 (see full year).

Return flights

10 Sep - 30 Sep Singapore Airlines
15 Sep - 29 Sep Singapore Airlines
01 Sep - 08 Sep Singapore Airlines
15 Sep - 06 Oct Singapore Airlines
06 Sep - 16 Sep Singapore Airlines
06 Sep - 13 Sep Singapore Airlines
13 Sep - 05 Oct Singapore Airlines
01 Sep - 24 Sep British Airways
06 Sep - 20 Sep Singapore Airlines
08 Sep - 26 Sep Singapore Airlines
08 Sep - 25 Sep Singapore Airlines
07 Sep - 25 Sep Malaysia Airlines
26 Sep - 12 Oct Malaysia Airlines
26 Sep - 11 Oct Malaysia Airlines
25 Sep - 09 Oct British Airways

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

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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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