The old farecompare.com site used to have a list of lowest fares available from various airports, along with filters and such to help suss out potential deals/mileage runs. It went away and getting a good collection of that data has been somewhat difficult for a while. It just got a bit easier! Now available is the Fare Finder from Wandering Aramean Travel Tools. It covers about 100 airports in North America and another 50 in Europe as origins for the queries. There are a bunch more destinations available in the results, too, with more being added as the system scales up. Right now there are over 360,000 fares in the database. It also has a built-in CPM calculator (based on direct distances, so you can probably do better) but does NOT include the YQ or other taxes, so take that in to consideration when looking at the fares. The default filters allow for limiting to an individual airport or by destination region. Registered users have the ability to filter the search results by carrier. And users who have upgraded to the First Class level can also filter by price range or on a radius from the origin airport. The fare data currently updates daily, though more frequent updates is part of the product road map. Oh, and while you're on that page, check out the options for finding *-UP fares from UA, US, DL and AA as well as SWUable fares from Delta or GPUable fares from United.