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 1306599 datapoints.)
Mon
MondaySGD 103
Tue
TuesdaySGD 113
Wed
WednesdaySGD 83
Thu
ThursdaySGD 107
Fri
FridaySGD 94
Sat
SaturdaySGD 95
Sun
SundaySGD 168
Analyse direct flights between Surabaya and Penang.
