GEG and HOU are approximately 1,716 miles apart by great-circle distance.
No. Roame's current schedule feed lists service with stops from GEG to HOU, but no nonstop service.
Airlines represented in the current schedule are Southwest Airlines (WN).
Aircraft listed in the current schedule include Boeing 737-800 Winglets (73H) and Boeing 737 MAX 8 (7M8).