What’s the difference between in time and on time?

If you are on time, you are not late or haven’t missed a deadline.

On time in a sentence examples 
I have to leave now if I want to be on time for my appointment.

We have a reputation for completing projects on time.

My plane landed on time.

If you are in time, you are not too late for an event or not too late to do something (i.e., you still have the opportunity to do it, but you may be later than planned/arranged or have missed a deadline).

In time examples in a sentence
If we leave right now, we’ll get there in time for the start of the film.

The project will be completed in time for Christmas.

We got to the boarding gate just in time; they were about to close.

Knowing whether in vs on vs at is correct often depends on the specific context.

Use QuillBot’s free Grammar Checker to help you use these prepositions correctly in your writing.