The air current may play a role as was mentioned by the others, but I also believe that different routes that the planes follow may play a role.
See, all airlines have their own specific route, specific height that they fly so as to avoid mid air collisions.
So the planes heading to USA are following a different predetermined route, that takes them a few extra hours for the above mentioned reasons.
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Because you are flying against the air current.
When flying westbound, you’ll be going with the jet stream…Flight time may also be affected by the route.
Because your flying against the wind current, where the wind kind of “pushes back” the plane.
you’re going into a headwind