Are there nonstop flights from Great Falls (GTF) to Boston (BOS)?

No. The fastest connection is via Chicago, about 4h 55m of total flying time.

What is the fastest connection from Great Falls (GTF) to Boston (BOS)?

via Chicago ≈ 4h 55m, via Denver ≈ 5h 30m, via Salt Lake City ≈ 5h 52m (estimated flying time, excluding layovers).

from 15,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Great Falls International Airport (GTF) to Boston Logan International Airport (BOS)・3,191 km

No nonstop flights. The fastest connection is via Chicago (ORD), about 4h 55m of flying time (layover not included).

With milesANA 15,000 miles+ (via DEN)JAL 23,000 miles+ (via SEA)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

5 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.