http://www.nonrev.net/tools/timetable/

Nonrev is a wonderful tool for commuters that not only tells you the direct flights, but how to connect through different cities and through different airlines. Some sites don't show SWA but this one does, the only flights you don't see are cargo operations

http://flightaware.com/ allows you to track all flights in order to see if they're running on time and when they will arrive.

Both are excellent tools that all pilots need to be aware of.