5 hours via airplane, if you could get a direct flight, however, most of the time you may need to fly from London to Montreal, then a domestic flight from Montreal to Halifax, this may take up to 10 hours including waiting time in Montreal.
Piccadilly Line will take you to Terminal 3.
The fastest is the train. It normally takes 1h 51m
Boat
By Helicopter.
Airplanes are the fastest way to travel a long distance. - Over short distances, some trains may be faster
Beacause it was the fastest and easiest way to travel.
Stagecoach.
By plane.
wormhole
yes
train
The fastest and most effective way to travel to Ukraine from California is probably by aircraft.