Yesterday we took the GoBus from Ohio University to Port Columbus Airport. It was cheaper and more comfortable way to get to Columbus at about $10.76 one-way. The other taxi services range from $25 to $120 excluding tips. The trip took 2 hours and 10 minutes due to about 5 stops.
It is best to buy your ticket ahead of time if going to Columbus but on the way back you can pay the driver.
Below are pictures of where you can find the GoBus stop at Ohio University.