Are there nonstop flights from Toronto (YYZ) to London (YXU)?

Yes. Air Canada Express fly this route. Flight time is about 40m.

Toronto → London

Toronto Pearson International Airport (YYZ) to London International Airport (YXU)・142 km

Nonstop flights available (1 airline). Flight time about 40m. Nonstop return flights also operate.

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