AirHint found the following cheapest return flights from Boston (BOS) to Shannon (SNN) in May 2026 (see full year).
Return flights
| 12 May - 27 May | Aer Lingus | direct | |
| 12 May - 26 May | Aer Lingus | direct | |
| 06 May - 30 May | Aer Lingus | direct | |
| 21 May - 30 May | Aer Lingus | direct |
Also check the deals for one-way flights from Boston to Shannon in May.
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