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

Return flights

26 Sep - 30 Sep	Lufthansa
24 Sep - 01 Oct	Lufthansa
25 Sep - 30 Sep	KLM
27 Sep - 28 Sep	Delta
27 Sep - 30 Sep	Delta
24 Sep - 28 Sep	KLM
27 Sep - 29 Sep	Delta
22 Sep - 28 Sep	KLM
26 Sep - 28 Sep	KLM
27 Sep - 01 Oct	Delta
26 Sep - 06 Oct	KLM
27 Sep - 21 Oct	Delta
26 Sep - 21 Oct	KLM
22 Sep - 03 Oct	United
27 Sep - 03 Oct	United
27 Sep - 04 Oct	Delta
26 Sep - 03 Oct	Delta
25 Sep - 30 Sep	Aer Lingus	direct
26 Sep - 30 Sep	Aer Lingus	direct
30 Sep - 06 Oct	Delta

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 $426

Return flights