I fly around 200,000 miles per year. Not all airlines are within a few dollars of each other. The ITIN that the OP wants is $192 on United and over $600 on Delta. Doing the right search, in the right way, can save. Alternate airports can help as well, especially in the case where you don't want the departure times available. CMH - BWI isn't as poplular a route as CMH - MCO because competition on that route is greater than to BWI. Yes, most of the search engines will be the same for the same flight, but we are branching out to locate different flights.