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

Return flights

03 Oct - 17 Oct	Aer Lingus	direct
03 Oct - 16 Oct	Aer Lingus	direct
08 Oct - 16 Oct	Aer Lingus	direct
03 Oct - 08 Oct	Aer Lingus	direct
04 Oct - 18 Oct	Aer Lingus	direct
03 Oct - 20 Oct	Aer Lingus	direct
15 Oct - 25 Oct	Aer Lingus	direct
03 Oct - 18 Oct	Aer Lingus	direct
03 Oct - 19 Oct	Aer Lingus	direct
30 Oct - 03 Nov	Ryanair
01 Oct - 19 Oct	Ryanair
28 Oct - 04 Nov	Aer Lingus
28 Oct - 04 Nov	Aer Lingus	direct

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

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 October from $584

Return flights