IN TIME versus ON TIME

[nordway]

Which of the sentences is correct?
Only half the guests had arrived on time.
Only half the guests had arrived in time.

[MartinEnglish]

Two different meanings.
On time = the correct time. "The meeting starts at 2pm, please be on time." (not late)
in time = not to late to do something "I was late for the meeting but I was in time to hear what John said."

[Raymott]

Which of the sentences is correct?
Only half the guests had arrived on time.
Only half the guests had arrived in time.

They are both correct, but they mean different things.
"On time" is used when a definite time is given, say 8pm. If you are invited for dinner, for example, and asked to be there by 8pm, and you're not, then you're not "on time". However, you might be "in time" for dinner, given that it hasn't been served yet.
"In time" is used when there is some event that is going to happen whether you are there or not. If you are late, you miss out. "I didn't reach the wharf in time for the 6 o'clock ferry".

[billmcd]

Which of the sentences is correct?
Only half the guests had arrived on time. At the time required.
Only half the guests had arrived in time. In sufficient time to fully participate in or to observe the activity or event.

b.

[nordway]

OK, what is I extend the sentence:
Only half the guests had arrived on/in time for the wedding ceremony.
Which preposition shall be used?

[bhaisahab]

OK, what is I extend the sentence:
Only half the guests had arrived on/in time for the wedding ceremony.
Which preposition shall be used?

Both are correct. Read the other posts.