The best day to arrive at Medan is Thursday and it would be best to avoid Friday, as prices are on average 6.77% higher than on Thursday. (Average prices, based on 1086421823 datapoints.)
The best time to book is 36 days before the departure date. You will get, on average, the cheapest price for flight IU899. (Average prices, based on 4187 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 4433 datapoints.)
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