Bombardier Q400 Speed:
Q400 Max Cruise Speed: 360 kts (knots), 414 mph, 667 km/h (Kilometers per Hour)
Q400 High Speed Cruise: 349 kts (knots), 402 mph, 646 km/h (Kilometers per Hour)
Q400 Long Range Cruise Speed: 287 kts (knots), 330 mph, 532 km/h (Kilometers per Hour)
Bombardier Q400 Specifications - Dimensions | Sun Airlines 