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

Return flights

22 Sep - 29 Sep	Iberia For Level
30 Sep - 07 Oct	Iberia For Level
24 Sep - 28 Sep	Vueling Airlines
24 Sep - 29 Sep	Icelandair
15 Sep - 30 Sep	Iberia For Level
16 Sep - 23 Sep	Vueling Airlines
17 Sep - 23 Sep	Vueling Airlines
06 Sep - 13 Sep	Fly Play
04 Sep - 07 Sep	Icelandair
01 Sep - 09 Sep	TAP
28 Sep - 05 Oct	Icelandair
12 Sep - 16 Sep	TAP
19 Sep - 20 Oct	TAP
18 Sep - 02 Oct	TAP
13 Sep - 04 Oct	Icelandair
28 Sep - 03 Oct	Icelandair
13 Sep - 04 Oct	Aer Lingus	direct
19 Sep - 20 Oct	Aer Lingus	direct
26 Sep - 03 Oct	Aer Lingus	direct
27 Sep - 04 Oct	Aer Lingus	direct

Also check the deals for one-way flights from Dublin to Boston 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 Dublin to Boston in September from 305€

Return flights