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

Return flights

29 Aug - 03 Sep	Ryanair
30 Aug - 31 Aug	Aer Lingus	direct
25 Aug - 31 Aug	Delta
19 Aug - 23 Sep	Ryanair
22 Aug - 26 Aug	Ryanair
04 Aug - 17 Aug	Ryanair
04 Aug - 10 Aug	Ryanair
04 Aug - 11 Aug	Ryanair
04 Aug - 09 Aug	Ryanair
04 Aug - 14 Aug	Ryanair
04 Aug - 20 Aug	Ryanair
05 Aug - 12 Aug	Ryanair

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 $608

Return flights