AirHint found the following cheapest return flights from Shannon (SNN) to Boston (BOS) in May 2026 (see full year).

Return flights

28 May - 01 Jun	KLM
27 May - 08 Jun	KLM
13 May - 19 May	Aer Lingus
12 May - 26 May	British Airways
16 May - 20 May	British Airways
21 May - 03 Jun	British Airways
01 May - 10 May	United
03 May - 10 May	United
01 May - 05 May	United
12 May - 26 May	Aer Lingus	direct
03 May - 10 May	Aer Lingus	direct
27 May - 08 Jun	Aer Lingus	direct
21 May - 03 Jun	Aer Lingus	direct
04 May - 07 May	Aer Lingus	direct
28 May - 01 Jun	Aer Lingus	direct
18 May - 20 May	Aer Lingus

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

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 May from $488

Return flights