Cheapest return flights from Shannon to Boston in September from $450

Best time to book flights for Shannon (SNN) to Boston (BOS) flights at AirHint

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

Return flights

04 Sep - 07 Sep Aer Lingus direct
04 Sep - 08 Sep Aer Lingus direct
04 Sep - 11 Sep Aer Lingus direct
01 Sep - 18 Sep Aer Lingus direct
19 Sep - 29 Sep Aer Lingus direct
01 Sep - 10 Sep United
01 Sep - 10 Sep Aer Lingus direct
15 Sep - 01 Oct Aer Lingus direct
01 Sep - 05 Sep Ryanair
01 Sep - 05 Sep Aer Lingus direct

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

Book a cheap hotel in Boston

Cheap car rent in Boston