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

Return flights

05 Dec - 14 Dec	China Airlines
05 Dec - 15 Dec	China Airlines
04 Dec - 15 Dec	China Airlines
01 Dec - 15 Dec	China Airlines
25 Dec - 13 Jan	China Airlines
28 Dec - 09 Jan	China Airlines
28 Dec - 10 Jan	Korean Air
29 Dec - 10 Jan	China Airlines
26 Dec - 12 Jan	STARLUX Airlines
27 Dec - 10 Jan	China Airlines
25 Dec - 10 Jan	China Airlines
15 Dec - 05 Jan	China Airlines
26 Dec - 04 Jan	China Airlines
19 Dec - 17 Jan	Korean Air
16 Dec - 30 Dec	China Airlines

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

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 December from $985

Return flights