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

Return flights

15 Sep - 19 Sep	WestJet
13 Sep - 20 Sep	WestJet
23 Sep - 07 Oct	WestJet
16 Sep - 11 Oct	WestJet
28 Sep - 07 Oct	Air Canada
23 Sep - 02 Oct	WestJet
15 Sep - 11 Oct	Air Canada
30 Sep - 11 Oct	Air Canada
27 Sep - 02 Oct	WestJet
25 Sep - 02 Oct	WestJet
04 Sep - 27 Sep	Air Canada
05 Sep - 12 Sep	Air Canada
25 Sep - 06 Oct	WestJet
11 Sep - 26 Sep	WestJet

Also check the deals for one-way flights from Ottawa 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.

Book a cheap hotel in Dublin

Cheap car rent in Dublin

Cheapest return flights from Ottawa to Dublin in September from 447€

Return flights