The best month to fly with Flight SQ991 is November and the most expensive month to fly is December. (Average prices, based on 957 datapoints.)
The best day to arrive at Medan is Sunday and it would be best to avoid Thursday, as prices are on average 115.6% higher than on Sunday. (Average prices, based on 2783027 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 113 datapoints.)