AirHint found the following cheapest return flights from Montreal (YUL) to Dublin (DUB) in August 2025 (see full year).

Return flights

29 Aug - 05 Sep	Porter Airlines (Canada) Ltd
19 Aug - 09 Sep	Air Transat
28 Aug - 04 Sep	Air Transat
20 Aug - 27 Aug	WestJet
22 Aug - 29 Aug	WestJet
17 Aug - 29 Aug	WestJet
24 Aug - 29 Aug	WestJet
27 Aug - 03 Sep	Air Transat
31 Aug - 13 Sep	Air Transat
31 Aug - 07 Sep	Air Transat
18 Aug - 30 Aug	FrenchBee
11 Aug - 30 Aug	FrenchBee
06 Aug - 13 Aug	Air Transat
19 Aug - 26 Aug	Air Transat
21 Aug - 28 Aug	Air Transat
25 Aug - 30 Aug	FrenchBee
30 Aug - 06 Sep	Air Transat
29 Aug - 09 Sep	Air Transat
25 Aug - 01 Sep	TAP
11 Aug - 04 Sep	FrenchBee

Also check the deals for one-way flights from Montreal to Dublin in August.

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 Montreal to Dublin in August from 502€

Return flights