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 do the trains to Warsaw leave from?
You can take the train to Warsaw at Siedlce, Siedlce Wschodnie or Siedlce Zachodnie, which arrives at Warszawa Ochota, Warszawa Śródmieście PKP, Warszawa Centralna, Warszawa Wileńska or Warszawa Zachodnia.
How long to you need to get to Warsaw by train?
With the fastest connections you will be in Warsaw in 1 hour and 12 minutes, but on average it takes 1 hour and 40 minutes. The first train headed to Warsaw is at 03:05, while the last one leaves Siedlce at 06:05.