Over the weekend/On the weekend and At the weekend

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Over the weekend

Over the weekend means the same thing as during the weekend. It is used to talk about something that happened (or will happen) between Friday evening and Sunday evening.

On the weekend (American English)

The meaning of on the weekend is similar to the meaning of over the weekend, although it is not used quite as often. The two expressions are usually interchangeable and choosing one or the other is mostly a matter of personal preference

On the weekends(American English)

These are all good sentences in English:

•         They go sailing on (the) weekends.

•         I usually leave early on (the) weekends.

•         On (the) weekends, I like to watch football.

while these sentences would sound very odd to a native speaker:

•         *They go sailing over (the) weekends.

•         *I usually leave early over (the) weekends.

•         *Over (the) weekends, I like to watch football

At the weekend (British English expression)