Not completely sure what you mean by 'a great time to travel' in a 'time' sense; when dealing with the Knights always look at their horse in regards to the question asked.
Pentacles: Horse is standing still - movement not started or may not happen.
Cups: Horse is walking - movement, but slowly - results will happen but farther down the road.
Wands: Horse is cantering - movement has begun and proceeding quickly; results are soon but not immediately.
Swords: Horse at full gallop - Results happening immediately and about to go past you.