Sometimes, the airport closest to your starting point is not the cheapest option for travel. This often occurs when your closest airport is dominated by one or two major airlines that set prices and drive out low-cost competitors. Sometimes, you have no choice. But if a one-hour drive to another airport will result in significant savings, you must at least consider pricing your airfares within a certain radius of home.
Large airports offer a lot of flight choices, but you'll benefit only if there is plenty of competition. Cincinnati, for example, has a reputation for high fares because most arrivals and departures there are Delta flights. Dallas-Fort Worth is also a Delta hub, but has a wider selection of other carriers. More information of shopping for an airport discount.