You've got a number of choices in United States of America. Once you've planned where you're headed and compared distances, picking one of these main airports will be simple: Hartsfield-Jackson Atlanta Intl. Airport (ATL) - 56,780 flights per month. O'Hare Intl. Airport (ORD) - 55,671 flights per month. Dallas-Fort Worth Intl. Airport (DFW) - 47,108 flights per month.