I'd suggest using FlightAware to look at the various options. Just plug a flight number into the url (
http://www.flightaware.com/live/flight/_______) where _______is the flight using the three digit airline identifier (AAL, UAL, SWA, DAL etc.) followed by the flight number. For example (
http://www.flightaware.com/live/flight/AAL2592).
Cheers,
Cameron