Flight Indira Gandhi International Airport departs from Delhi Indira Gandhi International Airport at 09:00 and arrives at Singapore Changi Airport at 17:15.
The flighttime is about 5h 45m. The distance travelled ("as the bird flies"): 2903 Km. So the average speed is roughly 505 Km.
There is an 2.5 hour time difference between Delhi and Singapore
The best day to arrive at Delhi is Saturday and it would be best to avoid Tuesday, as prices are on average 74.86% higher than on Saturday. (Average prices, based on 142306 datapoints.)
We have a lot more statistics for flights SQ 401 and between Delhi and Singapore.
