Top speed is the maximum speed a fighter aircraft can achieve in flight. This speed depends on the design of the aircraft and the power of its engine. Modern fighter aircraft generally have a top speed of Mach 1.5 to Mach 2.5 (about 1,800 to 3,000 km/h), depending on the aircraft type.

Most modern fighter jets in 2026 have a top speed ranging between Mach 1.6 and Mach 2.5. For example, the F-35 Lightning II is capped at Mach 1.6 to preserve its stealth coating, while the F-22 Raptor can hit Mach 2.25. Heavier "missile trucks" like the F-15EX Eagle II are even faster, capable of reaching Mach 2.5 (about 1,900 mph). However, it is a common misconception that these jets fly at top speed constantly; high-Mach flight consumes fuel at an astronomical rate, significantly reducing the aircraft's combat range. Most missions are flown at subsonic speeds (Mach 0.8 to 0.9). A key 2026 capability is "Supercruise," which allows advanced jets like the F-22 or the Eurofighter Typhoon to maintain supersonic speeds (above Mach 1.0) without using fuel-guzzling afterburners. While some experimental or specialized interceptors like the MiG-31 can push toward Mach 3, the vast majority of 2026's frontline fighters balance their speed with stealth and maneuverability, prioritizing the Mach 1.8 to 2.2 range for optimal performance.