The world's longest commercial flight has died once already. Singapore Airlines launched nonstop Singapore–Newark and Singapore–Los Angeles services in 2004 using the Airbus A340-500, a genuine novelty at the time: no airline had ever connected Singapore and the US without a stop. The Newark run stretched 8,285 nautical miles and could take more than 18 hours in the air. But when oil prices more than doubled by 2013, the thirsty quadjets stopped making sense, and the routes were scrapped.

The comeback came courtesy of a new generation of aircraft. United restarted Singapore–San Francisco nonstops in 2016 with a Boeing 787-9, and Singapore Airlines answered with the Airbus A350-900 — then pushed Airbus for a special ultra-long-range version. The A350-900ULR got aerodynamic tweaks, a higher gross weight, software changes to squeeze in more fuel, and even a blocked-forward cargo hold. Six of them let the airline relaunch Newark in October 2018 and Los Angeles the following month, burning 25–30% less fuel than the old A340-500s. That difference turned a money-loser into a keeper.

Since then the US network has grown to five nonstop gateways. Seattle joined in 2019, a second daily San Francisco flight followed, and in late 2020 the airline quietly began flying to JFK — a route that now edges out Newark as the world's longest nonstop at 8,288 nautical miles. Only two fifth-freedom one-stops remain: Los Angeles via Tokyo and New York via Frankfurt, while the Houston-via-Manchester service ended in 2025.

There's a treat coming for passengers too. The ULR jets currently have 67 business seats and 94 in premium economy, but a refit will add a first class cabin — a first on any nonstop Singapore–US flight — plus 70 business seats and a slimmer 58-seat premium economy cabin, cutting total capacity from 161 to 132. New staggered business seats with sliding doors, Starlink WiFi and updated amenities are expected on refurbished aircraft from early 2027.

For travellers, this is one of the quiet wins of modern aviation: you can now get between Singapore and the US East Coast without touching down anywhere, in a seat quality war that keeps improving. If you've got the stamina for 18-plus hours, book the ULR-configured jets on New York or San Francisco routes for the most premium setup.