AirHint found the following cheapest one-way flights from Ontario (ONT) to Tokyo (NRT) in September 2025 (see full year).

One-Way flights

14 Sep	Alaska Airlines
02 Sep	Alaska Airlines
10 Sep	Alaska Airlines
01 Sep	Alaska Airlines
28 Sep	Alaska Airlines
29 Sep	Alaska Airlines
21 Sep	Alaska Airlines
30 Sep	Alaska Airlines
07 Sep	Alaska Airlines
22 Sep	Alaska Airlines

Also check the deals for return flights from Ontario to Tokyo 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 Ontario to Tokyo in September from $329

One-Way flights