It is "unacceptable" that low-cost rail fares are easily available only to those with internet access, MPs say.
The House of Commons Public Accounts Committee said people without use of the internet or time to search should have the same access to low fares.
Train operators said fare structures had been simplified and that tickets could be bought in a variety of ways.
The Public Accounts Committee report said that while the Department for Transport (DfT) set requirements for service frequency and punctuality it did not measure rising car park charges, complex fares and overcrowding.
Chairman Edward Leigh said: "It is unacceptable that you have to have access to the internet to get the cheapest fares.
"Those without such access, without time to search or who travel at short notice are stuck with paying through the nose.
"Fare structures should be easy to understand and the cheapest fare for a journey should be publicised and readily available at station ticket offices."