AirHint found the following cheapest return flights from Ontario (ONT) to Hanoi (HAN) in October 2025 (see full year).

Return flights

26 Oct - 09 Nov	Korean Air
23 Oct - 30 Oct	Korean Air
30 Oct - 27 Nov	Korean Air
31 Oct - 07 Nov	China Airlines
19 Oct - 26 Oct	China Airlines
01 Oct - 20 Oct	China Airlines
03 Oct - 06 Oct	China Airlines
01 Oct - 10 Oct	China Airlines
01 Oct - 31 Oct	China Airlines
15 Oct - 25 Oct	China Airlines
13 Oct - 18 Oct	China Airlines
13 Oct - 17 Oct	China Airlines
09 Oct - 16 Oct	China Airlines
18 Oct - 05 Nov	China Airlines

Also check the deals for one-way flights from Ontario to Hanoi in October.

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 Ontario to Hanoi in October from $693

Return flights