December travel costs significantly increase due to high demand, limited availability, school holidays, and special events. Flights can be 25-60% more expensive, while hotel rates rise by 30-50%. Budgeting strategies include using a trip budget calculator, booking early, considering alternative dates, and comparing destinations. Travelers can save by using rewards points, bundling bookings, and being flexible with airports. Popular budget-friendly destinations include Mexico City and Lisbon, while splurge-worthy options are New York City and the Maldives. Careful planning can help manage costs and create memorable holiday experiences.