An appropriate time series model for predicting passenger data of Djalaluddin Gorontalo Airport, the interval between 2003 - 2017 with the multiplicative of Holt's-Winters' exponential smoothing as Y^t+p=(Lt+pTt)St−12+p, where for time t, the original exponential smoothing data, Lt=0.2YtSt−12+0.8(Lt−1+Tt−1), smoothing trend patterns Tt = 0.2(Lt − Lt−1) + 0.8Tt−1 and smoothing seasonal patterns, St=0.2YtLt+0.8St−12, so the smoothing parameter used are α = β = γ = 0.2. After several treatments, the mean square deviation (MSD) is 3287241 for arrival passenger data and MSD is 2490279 for passenger departure data with a seasonal length of 12 by do not event-based. The next, the MSD is 1334585 for arrival passenger data and MSD is 1433867 for passenger departure data with a seasonal length of 12 by Eid al-Fitr event-based, the MSD is 1259600 for arrival passenger data and MSD is 1252548 for passenger departure data with a seasonal length of 12 by Eid al-Adha event-based.