Too many variables. How high do you have to pump things? How deep must the line be burried? Lots of rock, trees, or ledge to go through, around? Do you have to go from the back of the house to the front to get it to the sewer line? Is the basement finished? Do you have power nearby? How easy will it be to get power to the pump?
Keep in mind that in most places, to decommission a septic system, you can't just cap it off. You must pump the tank and fill it with soil/sand/gravel, so that when it may eventually degrade, it doesn't become a hazard when someone breaks through and falls in.