The Future forms:
1) Present Simple -> Timetables/Schedules
Examples:
The train/bus/airplane leaves at 9 am.
School starts at 8 am
The stores open at 7 am
2) Going to + verb ->
- plans/intententions to do something
- present evidence that something is going to happen
Examples:
I have bought milk, eggs and flower because I am going to make pancakes this evening.
Can you hear the thunder? It is going to rain soon.