For price around HK$3500 it shall be roundtrip (來回機票) Will you be depart and return on Fri-Sun. If depart and return Mon-Thu price will be HK$3082 include all tax and fuel surcharges. Those are fixed when you complete with your credit card input in wedsite. Remind that was non-refundable and fixed for whole trip or with a big amount of change penalty . Please refer to -Fare Rules- at the bottom of the Flight Summary page