NOTE: As Mach values are largely temperature-dependent (outside air), the end-value presented below is representative of an object traveling at sea-level (15C / 59F). The speed of sound increases as ambient temperatures increase making the speed represented by Mach 1 variable. The Subsonic regime is up to 529 knots while Transonic flight is achieved between 529 and 794 knots. Supersonic flight occurs at 794 to 3,307 knots. Hypersonic speeds are experienced between 3,307 and 6,673 knots.
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1 Mach (M) = 666.739 knots (kts).