Find route having a callsign

Hi everyone,
does anyone know a free way to find a flight route having a callsign? does an online or offline database exist?

Thank you for you reply

Paola

Try to get a "FlightRoute.sqb" database. You should be able to get one through the PlanePlotter software or from the VirtualRadarServer community or in a Yahoo group!

There are two more pitfalls on this way:
1. Callsigns from ADS-B data and flight numbers from database are not always identical. Currently it is nearly identical for flight number LH839 and callsign DLH839, but not for flight LH2285 and callsign DLH6AC.
2. If the flight number belongs to a codeshare flight, even the operator ID may differ between database entry and callsign.

Flightaware offers an API, where the first 500 calls/month are for free. It may help to identifiy codeshare flights and to get the time window for a certain flight.

Thank you both for your answers. I found a FlightRoute.sqb DB. This is exactly what I was looking for.
jluebbe thank you for your advice and these precious informations.

Paola