The best day to arrive at Surabaya is Wednesday and it would be best to avoid Sunday, as prices are on average 101.3% higher than on Wednesday. (Average prices, based on 647302 datapoints.)
MondayAUD 135
Mon
TuesdayAUD 142
Tue
WednesdayAUD 105
Wed
ThursdayAUD 132
Thu
FridayAUD 118
Fri
SaturdayAUD 120
Sat
SundayAUD 211
Sun
Analyse direct flights between Surabaya and Penang.