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

Return flights

29 Oct - 05 Nov	British Airways
14 Oct - 21 Oct	British Airways
21 Oct - 15 Nov	British Airways
27 Oct - 22 Nov	British Airways
15 Oct - 22 Oct	Iberia
23 Oct - 07 Nov	Finnair
31 Oct - 07 Nov	Finnair
21 Oct - 28 Oct	Finnair
22 Oct - 29 Oct	Finnair
07 Oct - 14 Oct	British Airways
18 Oct - 01 Nov	Finnair
25 Oct - 01 Nov	Finnair
17 Oct - 31 Oct	Finnair
31 Oct - 15 Nov	British Airways
08 Oct - 22 Oct	Iberia
08 Oct - 15 Oct	Iberia
31 Oct - 14 Nov	British Airways
01 Oct - 08 Oct	British Airways
17 Oct - 24 Oct	British Airways
27 Oct - 03 Nov	Air France

Also check the deals for one-way flights from Ontario to Warsaw 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 Warsaw in October from $512

Return flights