17 hours.
Direct flights take approximately 10 hrs.
Flights via London takes 11 - 12 hrs depending on the layover time at London.
There are no direct flights between Mexico and Northern Ireland. Common connections include London, Toronto (Canada) and Newark (USA), meaning your flight may take from 16 hours (Belfast - Newark - Mexico City) up to 35 hours or more (Belfast - London - Toronto - Mexico City).
You don't mention where in Canada you're departing from, but the flight time from Toronto Canada to Dublin Ireland is 6 hours, 33 minutes.
TORONTO IS IN CANADA.
According to HowManyHours, about 7 hours.
Depends on your flight path; generally expect anywhere from 5 to 10 hours.
The flight time is 9 hours, 7 minutes.
The flight distance from Toronto, Canada to Montreal, Canada is: 314 miles / 506 km
A flight from Karachi, Pakistan to Toronto, Canada takes about 15 hours. The distance from Karachi, Pakistan to Toronto, Canada is 7,259 miles or 11,683 kilometers.
A flight from Toronto, Canada to Denmark takes about 8 hours. The distance from Toronto, Canada to Denmark is 3,797 miles or 6,110 kilometers.
The flight distance from Montreal, Canada to Toronto, Canada is: 314 miles / 506 km
The flight time is 12 hours.
1 hour ten minutes. I think only Aer Arann fly this route though.