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

Return flights

02 May - 06 May	Ryanair
23 May - 30 May	Air France
23 May - 31 May	Air France
28 May - 01 Jun	KLM
24 May - 10 Jun	Air France
27 May - 10 Jun	Air France
28 May - 08 Jun	KLM
28 May - 04 Jun	Delta
30 May - 05 Jun	Delta
06 May - 10 May	Ryanair
05 May - 07 May	Ryanair
21 May - 25 May	British Airways
08 May - 13 May	British Airways
09 May - 11 May	British Airways
19 May - 26 May	British Airways
19 May - 02 Jun	British Airways
01 May - 09 May	United
28 May - 08 Jun	Aer Lingus	direct
28 May - 04 Jun	Aer Lingus	direct
28 May - 18 Jun	Aer Lingus	direct

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.

Book a cheap hotel in Boston

Cheap car rent in Boston

Cheapest return flights from Shannon to Boston in May from $462

Return flights