San Francisco International Airport to San Diego International Airport train with Amtrak

Amtrak is the main passenger train operator in the United States, providing medium- and long-distance intercity services across 46 states and three Canadian provinces. Operating over 300 trains daily and serving more than 500 destinations, Amtrak connects cities and regions nationwide through routes such as the high-speed Acela in the Northeast Corridor, the scenic Coast Starlight along the West Coast, and the Empire Builder linking Chicago to the Midwest and the Pacific Northwest. Other notable services include the Northeast Regional, Keystone Service, and the unique Auto Train, which allows passengers to bring their cars onboard. Amtrak offers a variety of classes to suit different budgets and travel needs, including Coach, Business, First Class, and Sleeper Class with options like Roomettes, Bedrooms, and Bedroom Suites for overnight journeys. Ticket types include Saver, Value, Flexible, Business, and Premium. Onboard amenities vary by service but may include comfortable seating, Wi-Fi, power outlets, dining options, and lounge access on select trains. Popular routes include Washington, D.C.–Boston, San Diego–San Luis Obispo, San Jose–Sacramento, and Chicago–Seattle.