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

Return flights

07 Sep - 14 Sep	Air Canada
01 Sep - 08 Sep	Air Canada
14 Sep - 21 Sep	Air Canada
08 Sep - 15 Sep	Air Canada
13 Sep - 20 Sep	Air Canada
10 Sep - 17 Sep	Air Canada
03 Sep - 10 Sep	Air Canada
09 Sep - 16 Sep	Air Canada
06 Sep - 13 Sep	Air Canada
05 Sep - 10 Sep	Air Canada
30 Sep - 07 Oct	Air Canada
28 Sep - 08 Oct	Air Canada
29 Sep - 06 Oct	Icelandair
02 Sep - 16 Oct	United
30 Sep - 09 Oct	Icelandair
01 Sep - 01 Oct	SWISS
28 Sep - 05 Oct	Air Canada
26 Sep - 03 Oct	Air Canada
27 Sep - 04 Oct	Air Canada
23 Sep - 02 Oct	Air Canada

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.

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Cheapest return flights from Boston to Dublin in September from 282€

Return flights