うんちん is the standard on'yomi. 運 (ウン) means to transport, and 賃 (チン) means fare or charge. うんせん, うんそう, うんり are incorrect readings of 賃. This term refers to the fare or freight charge, which is the cost paid for the transportation of people or goods, serving as a general term for transport service payments.

うんちんは標準的な音読みです。運は「運ぶ」、賃は「料金」の意味。人や物を運ぶための料金や費用です。うんせん、うんそう、うんりは賃の誤読です。