[Grammar] Please correct my text

[Zoe2008]

I already booked the ticket and the cost is USD540.00. The difference cost is only USD40.00 if departure from China. So, we decided air / departure from HK which will be more convenience. It seems the ticket cost is so expensive which can be cover with the tourist cost.

 

[kfredson]

I already booked the ticket and the cost is USD540.00. The difference in cost is only USD40.00 if the departure is from China. So, we decided [STRIKE]air / departure[/STRIKE] to depart from HK, which will be more convenient. It seems the ticket cost is so expensive which can be covered with the tourist cost.

I am not sure what the last sentence means.