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

Return flights

27 Sep - 21 Oct	WestJet
27 Sep - 07 Oct	WestJet
30 Sep - 09 Oct	WestJet
29 Sep - 09 Oct	WestJet
29 Sep - 14 Oct	WestJet
30 Sep - 07 Oct	WestJet
23 Sep - 07 Oct	WestJet
26 Sep - 21 Oct	WestJet
26 Sep - 07 Oct	WestJet
17 Sep - 29 Sep	WestJet
25 Sep - 21 Oct	WestJet
23 Sep - 28 Sep	WestJet
20 Sep - 24 Sep	WestJet
01 Sep - 22 Sep	Iberia
02 Sep - 23 Sep	WestJet
09 Sep - 30 Sep	WestJet
22 Sep - 29 Sep	WestJet
17 Sep - 27 Sep	WestJet
23 Sep - 30 Sep	WestJet
16 Sep - 23 Sep	WestJet

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 439€

Return flights