Originally Posted by
thehoax
Like OP i'm a newbie to HKG heading out there this month. This is the first i have heard of buying Airport express separately. Is there a penalty if you use if for Airport Express?
The one way single person fare is HK$100, ticket or Octapus.
If there is more than two of you buying a "group" ticket would yield savings for multiple passenger ticket. Check the MTR AE website.