你明天坐飞机回国，一路平安啊。

Nǐ míngtiān zuò fēijī huíguó, yílù píng'ān a.

You’re flying back home tomorrow; have a safe journey.

路有点儿远，你们早点出发，一路平安。

Lù yǒudiǎnr yuǎn, nǐmen zǎodiǎn chūfā, yílù píng'ān.

The road is a bit long; set off a little earlier and have a safe trip.

祝你一路平安，到了给我打电话。

Zhù nǐ yílù píng'ān, dàole gěi wǒ dǎ diànhuà.

I wish you a safe trip; call me when you arrive.