AirHint found the following cheapest one-way flights from Bangkok (BKK) to Phnom-penh (PNH) in September 2025 (see full year).

One-Way flights

15 Sep	Thai VietJet Air	direct
18 Sep	Thai VietJet Air	direct
21 Sep	Thai VietJet Air	direct
04 Sep	Thai VietJet Air	direct
17 Sep	Thai VietJet Air	direct
26 Sep	Thai VietJet Air	direct
10 Sep	Thai VietJet Air	direct
14 Sep	Thai VietJet Air	direct
29 Sep	Thai VietJet Air	direct
30 Sep	Thai VietJet Air	direct

Also check the deals for return flights from Bangkok to Phnom-penh in September.

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 one-way flights from Bangkok to Phnom-penh in September from 37€

One-Way flights