On time means at the planned time, not late: The train left on time. In time means early enough, before it's too late: We got there in time to see the start.
Same situation, two choices. Pick an example.
The train arrived on time.
Exactly when it should happen: punctual, not late.
We got to the station in time to buy coffee.
Before it's too late, often with a little time to spare.
| Rule | On time | In time |
|---|---|---|
| Meaning | At the planned time | Before it's too late |
| Opposite | Late | Too late |
| Common patterns | be on time, start on time, arrive on time | in time for + noun, in time to + verb |
| Example | The film started on time. | We arrived in time for the start. |
The flight left _____, at exactly 7:40.
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Only just early enough, at the last moment: We caught the train just in time.
Yes. In time for + a noun (in time for dinner), in time to + a verb (in time to catch the bus).