| 🇪🇺 Europe — UK, France, Netherlands, Germany | EWRIADORD | Newark alone flies 16 European cities year-round. Dulles is the quieter twin with 13. Chicago covers the same ground from the Midwest, and Frankfurt/Munich are reachable nonstop from Denver, Houston and San Francisco too. |
| 🇪🇺 Europe — Mediterranean and the islands | EWRIAD | Almost entirely a summer network, and almost entirely Newark: Bari, Palermo, Split, Dubrovnik, Málaga, Palma, Faro, Funchal, Ponta Delgada, Santiago de Compostela. Dulles adds Athens, Nice and Venice. |
| 🇪🇺 Europe — Ireland, Scotland, Iceland, Greenland | EWRORDIAD | Dublin and Edinburgh year-round from Newark and Dulles. Shannon, Glasgow, Reykjavík and Nuuk are summer only — Nuuk is the first scheduled US–Greenland service. |
| Japan | SFOLAXEWR | Haneda from San Francisco, LA, Newark, Dulles and Chicago; Narita from all of those plus Denver, Houston and Guam. San Francisco adds Osaka and, from December 2026, Sapporo. |
| South Korea, China, Taiwan | SFOLAX | San Francisco has Seoul, Shanghai, Beijing and Taipei. LA has Shanghai, Beijing and Hong Kong. Newark adds Seoul from September 4, 2026. |
| Southeast Asia (Singapore, Bangkok, Manila, Ho Chi Minh City) | SFOLAX | SFO–SIN is one of the longest flights in the world and the only US nonstop to Singapore on United. Bangkok and Ho Chi Minh City are LA only; Manila runs from both SFO and Guam. |
| India | EWR | Newark–Delhi is United's only India nonstop. |
| Australia & New Zealand | SFOLAXIAH | SFO has Sydney, Brisbane, Auckland and — in season — Adelaide and Christchurch. LA has Sydney. Houston adds a seasonal Sydney, the longest Oceania route from the US interior. |
| Africa | IADEWR | Dulles is the gateway: Accra, Lagos and Cape Town. Newark adds Cape Town and Johannesburg, and Marrakesh in summer. No other United hub flies Africa. |
| Middle East (Tel Aviv, Dubai) | ORDEWR | Chicago–Tel Aviv is year-round. Newark–Tel Aviv resumes September 8, 2026; Dulles–Tel Aviv is suspended. Newark–Dubai is suspended. |
| South America — Brazil, Argentina, Chile, Peru | IAHEWR | Houston is the gateway: São Paulo, Rio, Buenos Aires, Santiago (seasonal), Lima, Quito, Medellín, Bogotá, Georgetown. Newark adds São Paulo, Lima and Bogotá; Dulles and Chicago add São Paulo. |
| Central America | IAHEWR | Houston flies all of it — Belize City, Guatemala City, San Salvador, Tegucigalpa, San Pedro Sula, Managua, Roatán, Liberia. Newark covers the same countries with fewer frequencies. |
| 🇲🇽 Mexico | IAHEWRORD | Houston has eleven Mexican cities, well beyond the resorts — Querétaro, León, Morelia-adjacent Bajío, Veracruz, Mérida, Monterrey, Guadalajara. Every other hub flies the beach map. |
| Caribbean | EWRIAHORD | Newark is the deepest: 23 islands counting the summer-only routes. Houston and Chicago cover the majors. |
| 🇨🇦 Canada | ORDDENIAH | Toronto and Vancouver from most hubs; Calgary and Edmonton from Denver, Houston and Chicago; Montréal and Ottawa summer only. |