Direct your web browser to Lufthansa.com and select your country and language, if prompted to do so.
Hover your mouse cursor over the "Book & Plan" tab. This will open a drop-down menu with other options; click on "Flight status" in this menu. This will open a new page which allows you to enter identifying information for the flight you are wondering about. Your options for lookup include flight number, departure airport, or departure and arrival airports. You will also need to choose either the arrival or departure date, which is limited to the day before the current date through five days after the current date.
Enter the identifying information for the flight, then click "Display Flights." This will open a new page displaying any matching flights. Beside each flight you will be able to view its route, its scheduled and actual departure or arrival time, its current status and its gate (if applicable).