Almost all information you need for flying over Czech Republic you will find here – informations about airports and airspaces, VFR and IFR approach charts, weather, NOTAMs etc.
Air Navigation Services of the Czech Republic
Category: Flight Planning
Skyvector
This site contains VFR and IFR aviation maps. In the beginning, only the USA and Alaska were covered, but the coverage grown worldwide. Very good source of charts, which is also free.