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.
In which stations can you take the train to Bydgoszcz and where will you arrive?
You can take the train to Bydgoszcz at Warszawa Wileńska, Warszawa Wschodnia, Warszawa Ochota or Warszawa Zachodnia, which arrives at Bydgoszcz Główna.
How long does it take from Warsaw to Bydgoszcz and when do the trains leave?
With the fastest connections you will be in Bydgoszcz in 4 hours, but on average it takes 5 hours and 26 minutes. The first train headed to Bydgoszcz is at 04:10, while the last one leaves Warsaw at 22:10.