May I inquire about the departure time?

请问飞机都什么时候起飞？

You have to be there half an hour before departure time.

你要在起飞前半小时到那里。

I'd like to check the departure time of the trains.

我想查一下这班火车的发出时间。

Please arrive at the airport two hours before your departure time.

请于飞机起飞前两小时到达机场。

My departure time is flexible. I don't mind a stopover. I want an unbeatable price.

我的出发时间很有弹性。我不介意中途停留。我要的是最棒的价钱。

Don't forget to be at the airport 45 minutes before departure time.

不要忘记在起飞前 45 分钟到达机场。

Definitely! What is the departure time?

没问题！起飞时间是什么时候？

Travelers will be required to present proof of a negative nucleic acid test result, received within 72 hours prior to departure time.

旅客需要出示登机前72小时内核酸检测阴性结果的证明。

You just need to arrive at the terminal at least an hour before the scheduled departure time to buy your ticket.

您只需在预定起飞时间前至少一个小时到达航站楼即可购买机票。

And by that I mean I always base my arrival to the airport on the boarding time of my flight not the departure time.

所以，我一般都是根据航班登机时间到达机场，而非起飞时间。