Nonstop flights from San Francisco International Airport (SFO) to Nashville International Airport (BNA) save time (about 4h 30–50m) and reduce the risk of missed connections, which is especially valuable in winter. Connecting flights often cost less and provide more schedule options, routing through hubs such as Dallas (DFW), Atlanta (ATL), Chicago (ORD), or Denver (DEN). In January, weather at connecting hubs can increase the risk of delays, so weigh savings against potential disruption. CTA: If minimizing travel time is a priority, book a nonstop; if saving money matters more, choose a one-stop itinerary with an ample connection window.