The ticket price constantly changes by airlines according to the sales. So, the chances are the ticket with price of USD1048.98 has been sold out. Anyway, you could contact the web where you see the price for details.

Thank you Ms Kay. There is no where on the Air China Website I could contact someone for details. I have called the reservation office in New York, and I was told I cannot reach anyone. When would be a good time to check for reduced airfare online?

Does a traveler with Singapore passport needs a visa to China if he/she visits the country for 2 weeks or less?
Thank you

Personally, just grasp the opportunity to make a booking once finding the cheap airfare, since just as what Ms Kay said, the ticket price always changes. Besides, no visa is required for ordinary passport holders of Singapore, if he/she enters to China through nominated international ports for up to 15 days for tourism, visiting or business purposes.