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

Return flights

08 Sep - 14 Sep	WestJet	direct
20 Sep - 24 Sep	WestJet
15 Sep - 08 Oct	Porter Airlines (Canada) Ltd
09 Sep - 16 Sep	Porter Airlines (Canada) Ltd
13 Sep - 16 Sep	WestJet	direct
08 Sep - 21 Sep	WestJet	direct
18 Sep - 07 Oct	WestJet
23 Sep - 28 Sep	WestJet
02 Sep - 10 Sep	WestJet
18 Sep - 19 Sep	WestJet
17 Sep - 18 Sep	WestJet
16 Sep - 23 Sep	WestJet	direct

Also check the deals for one-way flights from Calgary 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 Calgary to Dublin in September from 393€

Return flights