1. Hawker Siddeley Harrier (GR.1/GR.3):
- Maximum Speed: 735 mph (1,183 km/h) at sea level
2. BAe Harrier II (GR.5/GR.7/GR.9):
- Maximum Speed: 665 mph (1,071 km/h) at sea level
3. BAe Harrier II Plus (AV-8B):
- Maximum Speed: 655 mph (1,054 km/h) at sea level
4. McDonnell Douglas AV-8B Harrier II:
- Maximum Speed: 655 mph (1,054 km/h) at sea level
5. Boeing AV-8B Harrier II Plus:
- Maximum Speed: 667 mph (1,075 km/h) at sea level
These speeds represent the maximum level flight speeds of the Harrier jet variants.