I came across this sentence in the story Around the World in 80 Days, but I can't figure out what it means. Does it mean that it was an unusual route or not？
This is not a double negative like "I don't know nothing". The voyage they were on was the usual route for passengers crossing the Pacific, so in that sense it was not surprising that this other man was also on the ship. It would have been surprising if he had followed them on an unusual route.