Here are the specs from q400.com
Performance
Range: NM SM KM
Maximum range
(70 pax @ 200 lb) MCR, ISA, SL 1,362 1,567 2,522
Speeds:
Maximum cruise speed 360 kts 414 mph 667 km/h
Airfield Performance:
FAR takeoff field length
(SL, ISA, MTOW, HGW) 4,600 ft 1,402 m
FAR landing field length
(SL, ISA, MLW, HGW) 4,221 ft 1,287 m
Takeoff field length for 500nm sector
(ISA, 70 Pax, IGW) 3,720 ft 1,134 m
Landing field length for 500nm sector
(ISA, 70 Pax, IGW) 3,380 ft 1,030 m
Ceiling:
Maximum operating altitude 25,000 ft 7,620 m