Some of the world’s longest nonstop international flights from the United States now stretch well beyond 15 hours, linking American hubs directly with Southeast Asia, Australia, and the South Pacific. At the top end of the list in 2026 are routes such as Singapore Airlines’ nonstop flights from New York to Singapore, alongside ultra-long-haul services from carriers including Qantas, Air New Zealand, United, and Philippine Airlines. Route rankings and mileage figures in this article are based on Cirium Diio schedule data.

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