You can try this, I am not sure if this will work as I have never tried it. Want you want to do here is to save the flight plan than go to where the flight plan was saved at and right click on it and use the SAVE AS option you can than change the extension type of the file I would try a TXT file first
Like I said this might not work correctly.
Flight plans are saved as a pln file type which is designed to be opened by Flight Simulator.
If you change the file type or the extension as it is called the result might not be something that you can read.
Usually one would use a PDF converter program to change a file to a PDF document
 However I am not sure if you can do this or not . 
Another way of doing this without printing any thing is to make a hand written copy on a pad or something than open up a PDF file maker program and put it into it. 
