On Tuesday 17th February, I'm flying SGN-HKG on CX 766 arriving at 3:20 pm and leaving on CX 251 for London at 11:00 pm. I have a uni friend that I'm going to meet in the city for dinner and a drink before returning to the airport. I was wondering what time I should head back at the airport to catch my flight. I realise that it's Chinese New Year so this might throw a bit of a spanner in the works?