Are there nonstop flights from Toronto (YTZ) to Basseterre (SKB)?

No. The fastest connection is via Newark, about 4h 57m of total flying time.

What is the fastest connection from Toronto (YTZ) to Basseterre (SKB)?

via Newark ≈ 4h 57m (estimated flying time, excluding layovers).

Billy Bishop Toronto City Airport (YTZ) to Robert L. Bradshaw International Airport (SKB)・3,320 km

No nonstop flights. The fastest connection is via Newark (EWR), about 4h 57m 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.