Using the following code we can calculate the distance between two CLLocationCoordinate2D.

+(double)calculateDistance:(CLLocationCoordinate2D) f to: (CLLocationCoordinate2D) t
{

    //    CLLocation *locA = [[CLLocation alloc] initWithLatitude:f.latitude longitude:f.longitude];
    CLLocation *locA = [[CLLocation alloc] initWithCoordinate: f altitude:1 horizontalAccuracy:1 verticalAccuracy:-1 timestamp:nil];

    //    CLLocation *locB = [[CLLocation alloc] initWithLatitude:t.longitude longitude:t.longitude];
    CLLocation *locB = [[CLLocation alloc] initWithCoordinate: t altitude:1 horizontalAccuracy:1 verticalAccuracy:-1 timestamp:nil];

    CLLocationDistance distance = [locA distanceFromLocation:locB];

    return dist*0.00062137119;
}