Flight Noi Bai International Airport departs from Hanoi Noi Bai International Airport at 07:35 and arrives at Singapore Changi Airport at 11:55.
The flighttime is about 3h 20m. The distance travelled ("as the bird flies"): 599 Km. So the average speed is roughly 180 Km.
There is an 1 hour time difference between Hanoi and Singapore
The best day to arrive at Hanoi is Monday and it would be best to avoid Friday, as prices are on average 36.61% higher than on Monday. (Average prices, based on 200255 datapoints.)
We have a lot more statistics for flights GA 661 and between Hanoi and Singapore.