The best day to arrive at Delhi is Saturday and it would be best to avoid Sunday, as prices are on average 141.77% higher than on Saturday. (Average prices, based on 706825 datapoints.)
MondayNZD 162
Mon
TuesdayNZD 139
Tue
WednesdayNZD 141
Wed
ThursdayNZD 168
Thu
FridayNZD 134
Fri
SaturdayNZD 102
Sat
SundayNZD 247
Sun
Analyse direct flights between Delhi and Guwahati.