Direct flights from Boston Logan International Airport (BOS) to London Heathrow Airport (LHR) save time and reduce the risk of missed connections during December’s busy holiday season, but they often cost more. Connecting flights via US hubs (e.g., New York, Philadelphia, Chicago) or European gateways can be cheaper and open more schedule options, but they increase travel time and the chance of delays or missed connections, especially if winter weather affects the first leg. If traveling for a fixed holiday schedule, prioritize nonstop routes for reliability; if price-sensitive and flexible, consider well-timed connections with generous layovers. CTA: Evaluate nonstop availability for your December dates and weigh cost versus convenience before booking.