If you are flexible with your travel dates, always consider that you can buy extremely cheap train tickets if you avoid travelling in the weekends and if you choose to travel during the low season.
When travelling on such short distances, you can take into account also busses and carpooling options: with some luck you will find very cheap options, even if you book on short notice.
Which stations serve the rail line Charleroi - Kortrijk?
The trains to Kortrijk can leave from Charleroi-Sud / Charleroi-Zuid and arrive at Kortrijk.
How long will it take you from Charleroi to Kortrijk by train and when do the trains leave?
While the first train to Kortrijk leaves at 14:03, the last one is scheduled for 21:03. The average duration of the journey is of 2 hours and 37 minutes, but the fastest trains can get you to Kortrijk in 2 hours and 33 minutes.