We say arrive in a country, city or town and arrive at all other places: I have just arrived in Brazil.
We arrived at the airport two hours before our flight

In informal situations we can use get (to) instead of arrive (in / at). We also say arrive home / get home, arrive here /get here and arrive there /get there

We will arrive in Malaga very soon. and We will get to Malaga very soon

I didn"t arrive at work until ten o"clock. and I didn"t get to work until ten o"clock. We arrived home late at night. and We got home late at night

Note: that you can arrive, but you must get somewhere

I"ll phone you when we arrive. not when we get

We use at, in and on with expressions of time
at: at two o"clock, at midnight, at night, at the weekend, at Christmas
in: in the evening, in July, in summer, in 2008
on: on Monday, on Monday evening, on 22 July, on Christmas Day

Note: that we usually talk about place before time
I arrived at school at half past eight in the morning