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

Return flights

01 Sep - 08 Sep	Air Canada
03 Sep - 09 Sep	Air Canada
09 Sep - 16 Sep	SWISS
10 Sep - 15 Sep	Air Canada
07 Sep - 14 Sep	SWISS
01 Sep - 14 Sep	Icelandair
13 Sep - 20 Sep	Icelandair
07 Sep - 16 Sep	Air Canada
04 Sep - 24 Sep	Icelandair
02 Sep - 16 Oct	Icelandair
08 Sep - 15 Sep	United
02 Sep - 16 Oct	Air France	direct
01 Sep - 01 Oct	Air Canada
24 Sep - 01 Oct	Icelandair
29 Sep - 02 Oct	Aer Lingus	direct
30 Sep - 03 Oct	Aer Lingus	direct
30 Sep - 07 Oct	Aer Lingus	direct
01 Sep - 01 Oct	Aer Lingus	direct
28 Sep - 01 Oct	Aer Lingus	direct
24 Sep - 01 Oct	Aer Lingus	direct

Also check the deals for one-way flights from Boston 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 Boston to Dublin in September from $352

Return flights