AirHint found the following cheapest return flights from Phnom-penh (PNH) to Hanoi (HAN) in September 2025 (see full year).

Return flights

06 Sep - 07 Sep	Air Cambodia	direct
06 Sep - 08 Sep	Thai AirAsia
12 Sep - 15 Sep	Cambodia Airways
11 Sep - 16 Sep	Cambodia Airways
18 Sep - 21 Sep	Cambodia Airways
19 Sep - 22 Sep	Cambodia Airways
08 Sep - 15 Sep	Vietnam Airlines
07 Sep - 11 Sep	Air Cambodia
19 Sep - 23 Sep	Cambodia Airways
18 Sep - 23 Sep	Cambodia Airways

Also check the deals for one-way flights from Phnom-penh to Hanoi 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 return flights from Phnom-penh to Hanoi in September from $230

Return flights