In due course is a phrase that means something will happen either after a normal or appropriate amount of time or that the event will happen after the expected or estimated amount of time.
In due time is a direct synonym of in due course. It is usually paired with all in due time. This
A related phrase is in good time which means accomplishing a task well before the deadline. If it is all in good time the phrase is another synonym of in due course, but with the added expectation of patience on the part of the person waiting.
According to Google’s ngram viewer, in due time was the more popular phrase until around 1910 when in due course surpassed it in usage. Currently in due course is the only phrase we found consistently listed in all dictionaries, and therefore should have a slight preference in usage, at least for formal documents.
Examples
Ukraine’s biggest group of creditors said it had received Kiev’s latest debt restructuring proposal and would respond in due course, according to a statement issued on Friday. [Reuters]
In due time, all the people who mocked you will go from disparaging you to asking, “Hey… how’d you do that?” [TIME]
It went on to say ‘where children and young people were in need of protection, the risks to their safety and well being were being identified in good time and suitable action was taken’. [Scottish Daily Record]
“Those discussions are continuing and when there is something to be said, it’ll be said all in good time,” he said. [BBC News]