Flight Timing Confusion

Hello

I am wondering if you guys can help me with something that's been confusing me for days!

I am traveling on the 28th March on VS5 from LHR - MIA

We depart at 12.25 and arrive in Miami at 18.20.

However, if you go on the same flight the week after it arrives at 17:00.

The flight time is 9 hours 30 as apposed to 9hours 55 minutes but it doesn't explain the hour difference?

Does anyone has any ideas why there is this difference?

Thanks
Zjc

I think it may be to do with British Summer Time starting on 30th March.

I think it may be to do with British Summer Time starting on 30th March.

I thought this also but if you look at the vs5 flights departing before my flight they all leave at 12:25 and arrive at 17:20

It just seems to be the two weeks prior when the flight arrives an hour later.

Do American clocks change different to british?

Daylight Saving in the US starts 9th March this year.