I am a new customer of HK Express and have not 'UFly' Pass. I bought the department flight and need to buy return flight from 廣島 to 香港 (29 Apr 2017). HK Express has a promotion price of HK$798 until 30 Nov and 20% off by Citi Credit Card until 21 Nov. May I have your advice if I should buy the ticket this moment or wait for next promotion?