AirHint found the following cheapest return flights from Toronto (YYZ) to Dublin (DUB) in September 2025 (see full year).

Return flights

22 Sep - 25 Sep	Porter Airlines (Canada) Ltd
08 Sep - 15 Sep	TAP
11 Sep - 17 Sep	TAP
03 Sep - 17 Sep	TAP
04 Sep - 10 Sep	TAP
08 Sep - 17 Sep	TAP
29 Sep - 07 Oct	Aer Lingus	direct
29 Sep - 17 Oct	Aer Lingus	direct
16 Sep - 25 Sep	WestJet
30 Sep - 21 Oct	TAP
11 Sep - 26 Sep	TAP
18 Sep - 28 Sep	Aer Lingus	direct
11 Sep - 25 Sep	TAP
24 Sep - 15 Oct	TAP
30 Sep - 10 Oct	Icelandair
30 Sep - 06 Oct	TAP
25 Sep - 06 Oct	Icelandair
20 Sep - 08 Oct	Icelandair
18 Sep - 03 Oct	TAP
30 Sep - 10 Oct	Aer Lingus	direct

Also check the deals for one-way flights from Toronto to Dublin 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 return flights from Toronto to Dublin in September from 328€

Return flights