Slightly off-topic: Track works between Poznan and Warsaw (due to drag on till mid-2019) add an extra hour to the journey time from/to Berlin.Got to go to a wedding in Warsaw next August and am wondering about doing it by train, stopping in Amsterdam & Berlin each for a day.
They fly to Warsaw also from Liverpool and Birmingham. Of course things may change next year....However, try WIZZair for cheap flites-most likely even lower as 29 gbp or eur for seat-only for Luton-WAW,
It's 30 days actually. There are some discounted tickets which sell out pretty quickly.PKP Intercity do have advances but they go on sale quite late for planning such a trip, I was told 4-6 weeks and they don't last long.
It is, sort of....You'd think the rise would be a little more staggered
I once traveled from Warsaw to Krakow for 60zl (£12) in First Class which including a free hot drink, free snack, free soft drink and a choice of 3 hot meals (I chose Pasta) which was ridciolously good value.
However the most stupidest thing about the Intercity Premium Trains (Pendolinos) which are PKP's flagship when I first used them and also when I used them in April this year, is they do not have Wifi despite having good sockets and plenty of room to work.
Ironically the Express Intercity class (next one down) does have Wifi so you used to have the silly situation where people were often taking the class of trains down from the premium ones for business because that allowed them to use Wifi.