Eppley Airfield to Singapore Changi Airport
Approx. 14865 km - about 16h 36m in the air and 17h 54m total from gate to gate, at an average speed around 895 km/h.
Real-world flights on routes this long almost always include at least one stop. Use this nonstop estimate as a guide, and allow extra time for connections and layovers when planning your trip.