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

Return flights

15 Sep - 22 Sep	easyJet
12 Sep - 14 Sep	Ryanair
25 Sep - 02 Oct	Ryanair
08 Sep - 13 Sep	Ryanair
18 Sep - 25 Sep	Ryanair
19 Sep - 21 Sep	easyJet
22 Sep - 27 Sep	Ryanair
17 Sep - 21 Sep	Ryanair
22 Sep - 29 Sep	Ryanair
01 Sep - 03 Sep	easyJet
14 Sep - 14 Sep	easyJet

Also check the deals for one-way flights from Belfast 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 Belfast to Dublin in September from 112€

Return flights