Cheapest return flights from Boston to Shannon in September from 352€

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

Return flights

21 Sep - 11 Oct United
29 Sep - 03 Oct American Airlines
23 Sep - 25 Sep United
22 Sep - 05 Oct United
22 Sep - 29 Sep British Airways
26 Sep - 29 Sep British Airways
27 Sep - 29 Sep British Airways
24 Sep - 25 Sep British Airways
21 Sep - 11 Oct Aer Lingus direct
22 Sep - 05 Oct Aer Lingus direct
27 Sep - 29 Sep Aer Lingus direct
26 Sep - 29 Sep Aer Lingus direct

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

Skyscanner

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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