As soon as we knew, what resort and what date we sent out save the date, letters to our close friends and family, people we wanted there and may have needed time to save up, that was 18 months in advance. We are not preparing to send out traditional save the dates to all of our friends and family which is still 10 months from our wedding date. I used vista print for the both save the dates, we got free post card and discount invitation stock. You can also set up a discount code, which gives your guest 5% off, for groups of 10 or flying to the same destination with American Airlines, up to 10 months in advance Good Luck!