"When" is the most appropriate word to complete the question.
Here's the completed exchange:
Is our trip leaving?
It is leaving at 8.
When time?
اذا كان لديك إجابة افضل او هناك خطأ في الإجابة علي سؤال is our trip leaving? - It is leaving at 8. What time When time Where is اترك تعليق فورآ.