Are there nonstop flights from Boston (BOS) to Shannon (SNN)?

Yes. Aer Lingus fly this route. Flight time is about 5h 58m.

What is the fastest connection from Boston (BOS) to Shannon (SNN)?

via New York ≈ 7h 10m, via Newark ≈ 7h 14m, via Edinburgh ≈ 7h 24m (estimated flying time, excluding layovers).

from 27,500 ANA miles (economy, one way, based on the published award charts).

Boston Logan International Airport (BOS) to Shannon Airport (SNN)・4,646 km

Nonstop flights available (1 airline). Flight time about 5h 58m. Nonstop return flights also operate.

With milesANA 27,500 miles+ (via EWR)Economy, one way, estimate. Tap a connection for miles by cabin.

10 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.