Cheapest return flights from Shannon to Boston in September from $529

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

Return flights

03 Sep - 07 Sep Delta
10 Sep - 17 Sep Air France
08 Sep - 15 Sep Air France
07 Sep - 14 Sep Delta
16 Sep - 23 Sep British Airways
03 Sep - 07 Sep Aer Lingus direct
08 Sep - 15 Sep Aer Lingus direct
10 Sep - 17 Sep Aer Lingus direct
07 Sep - 14 Sep Aer Lingus direct
16 Sep - 23 Sep Aer Lingus direct

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

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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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