Excess abdominal fat loss is a marathon and not a sprint.
Making long-term sustainable changes in exercise and nutrition habits such as increasing physical activity, consuming a healthy balanced diet, consuming fewer calories than expended, and participating in regular resistance training (for every 1 pound in muscle you gain, you burn 50 more calories in your day) are the most effective means of reducing body fat and eliminating abdominal fat.
Keep in mind a safe fat loss regime will allow you to lose 2 to 4 pounds of FAT per week – any more than that and its most likely going to be muscle loss.