The sound pressure levels of Airbus A380–800 were lowest among selected models, while the in-cabin pressure level values of Airbus A350-900 were maximum.

This is a nuanced debate in 2026 aviation, but the general consensus is that the Airbus A380 remains the "quietest" in terms of the passenger cabin experience, while the Airbus A350 is quieter for the community on the ground. The A380's massive size allows for incredible sound insulation, making the interior "white noise" much lower than almost any other aircraft in history. However, the A350 features newer Rolls-Royce Trent XWB engines, which utilize advanced 2026 noise-reduction technology and a higher bypass ratio, resulting in a smaller "noise footprint" during takeoff and landing. For a passenger, the A380 often feels like sitting in a quiet library, whereas the A350 provides a very modern, hushed environment that is significantly quieter than older twin-engine jets like the 777. Effectively, if you want the quietest sleep inside the plane, the A380 wins; if you are measuring the environmental acoustic impact outside the plane, the A350 is the superior, more efficient modern performer.