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

Return flights

15 Sep - 29 Sep	Ryanair
24 Sep - 29 Sep	Vueling Airlines
10 Sep - 13 Sep	Fly Play
24 Sep - 28 Sep	Vueling Airlines
24 Sep - 30 Sep	Iberia For Level
11 Sep - 13 Sep	Fly Play
17 Sep - 05 Oct	Iberia For Level
15 Sep - 28 Sep	Ryanair
06 Sep - 11 Sep	Fly Play
16 Sep - 23 Sep	Vueling Airlines
06 Sep - 13 Sep	Fly Play
29 Sep - 06 Oct	TAP
28 Sep - 09 Oct	Icelandair
21 Sep - 06 Oct	TAP
19 Sep - 05 Oct	TAP
19 Sep - 05 Oct	Aer Lingus	direct
28 Sep - 09 Oct	Aer Lingus	direct
27 Sep - 04 Oct	Aer Lingus	direct
25 Sep - 02 Oct	Aer Lingus	direct
24 Sep - 01 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 $337

Return flights