And the stations you mentioned are all in the wrong order.
My mistake - I thought about going from £ódź to Warsaw.
With ModlinBus, Warszawa Centralna is rather the only option, but with a train to Modlin, Warszawa Zachodnia is better. Some of trains from Modlin doesn't stop at Warszawa Centralna. Every train from/to £ódź stops at Warszawa Zachodnia.
He or she needs to get to Dworzec Centralny/Central Station and then on any train to £ódź. Simple as.
From Modlin to £ódź it's simple, but from £ódź to Modlin it's just not so simple. Or it's simple too, but provided there is no problem with being at the airport 1,5 hour before the flight departure. But in this situation nobody can guarantee that he or she won't miss the flight.
I'm not trying to mislead anyone, I only want to help.