December features major events that influence travel volume for both Miami International Airport (MIA) and O'Hare International Airport (ORD). In Miami, Art Basel Miami Beach draws international visitors in early December, increasing flight and hotel demand near MIA; nearby destinations include Fort Lauderdale, West Palm Beach, and Key West for post-event beach escapes. In Chicago, holiday staples such as Christkindlmarket, Magnificent Mile lights, Lincoln Park ZooLights, and New Year's Eve festivities boost arrivals at ORD. Book flights and hotels early for event weekends, and consider traveling mid-week to avoid premium pricing.