October 2014 : I've just travelled Ryanair (Stansted/Modlin) and Modlin Airport is compact and totally serviceable.
The Modlin bus runs non-stop from the airport to Warsaw where it terminates at the Palace of Science and Culture. The journey takes around 45 mins.
Three things I'd suggest :
- buy your ticket online before you leave home as it's cheaper (you could save up to £5.00 per ticket). If you buy in advance and online it could cost as little as 6 zlotys for a one-way ticket, compared to (up to) 33 zlotys if you buy on arrival at Modlin Airport,
- confirm the return Warsaw/Modlin timetable when on the bus FROM the airport as the timetable on the Bus website is not always accurate, and
- make sure you book the return ticket in advance as the seat numbers are limited so don't always expect to just turn up and walk onto a particular bus without booking a seat in advance.
The bus service is excellent and a lot cheaper than a taxi. The service from the Airport is scheduled to match with airport arrivals.