Are there nonstop flights from Great Falls (GTF) to Toronto (YTZ)?

No. The fastest connection is via Chicago, about 4h 8m of total flying time.

What is the fastest connection from Great Falls (GTF) to Toronto (YTZ)?

via Chicago ≈ 4h 8m (estimated flying time, excluding layovers).

Great Falls International Airport (GTF) to Billy Bishop Toronto City Airport (YTZ)・2,508 km

No nonstop flights. The fastest connection is via Chicago (ORD), about 4h 8m of flying time (layover not included).

None.

1 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.