AirHint found the following cheapest return flights from Shannon (SNN) to Boston (BOS) in August 2025 (see full year).

Return flights

30 Aug - 03 Sep	United
25 Aug - 29 Aug	United
31 Aug - 04 Sep	United
24 Aug - 30 Aug	United
23 Aug - 25 Aug	United
21 Aug - 27 Aug	United
21 Aug - 26 Aug	United
22 Aug - 24 Aug	United
22 Aug - 26 Aug	United
23 Aug - 27 Aug	United
22 Aug - 29 Aug	United
24 Aug - 31 Aug	United
24 Aug - 20 Sep	United
23 Aug - 20 Sep	United
24 Aug - 20 Sep	Aer Lingus	direct
23 Aug - 20 Sep	Aer Lingus	direct

Also check the deals for one-way flights from Shannon to Boston in August.

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 Shannon to Boston in August from $740

Return flights