How far in advance should I book train tickets from Brussels to Orly?

The best time to book your train from Brussels to Orly is <b>70 days before departure</b>. See how prices for trains change on the Brussels to Orly route.预订从布鲁塞尔至奥利机场的火车，最佳时机为出发前70天。观察布鲁塞尔至奥利机场线路的火车票价变化情况。