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

Return flights

15 Sep - 30 Sep	Korean Air
10 Sep - 28 Sep	Korean Air
08 Sep - 07 Oct	Korean Air
10 Sep - 07 Oct	Korean Air
11 Sep - 08 Oct	Korean Air
11 Sep - 27 Sep	Korean Air
14 Sep - 14 Oct	Korean Air
07 Sep - 07 Oct	Korean Air
12 Sep - 28 Sep	Korean Air
09 Sep - 09 Oct	Korean Air
11 Sep - 09 Oct	Korean Air
10 Sep - 30 Sep	China Airlines
11 Sep - 29 Sep	Alaska Airlines
09 Sep - 02 Oct	Qatar Airways
17 Sep - 30 Sep	Qatar Airways
10 Sep - 08 Oct	Qatar Airways
01 Sep - 30 Sep	Qatar Airways

Also check the deals for one-way flights from Ontario 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.

Book a cheap hotel in Phnom-penh

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Cheapest return flights from Ontario to Phnom-penh in September from $792

Return flights