From 1 August 2020 onward the Belgian Public Health Department requires anyone traveling to Belgium & staying there longer than 48 hours, to fill in the Public Health Passenger Locator Form.
Anyone arriving to Belgium by airplane or boat from anywhere outside of the EU, will be required to submit to a 14 day quarantine. The quarantine can be fulfilled at home or at any other place of your choosing. This element of the regulation is not very clearly indicated, we found it here (click) at the Transport & International FAQ towards the bottom of the page.
If you arrive to Belgium by car/bus/train from any of the neighboring countries while having a recent travel history outside of the EU, you are expected to follow the same procedure. Please check the regulations in force in the country where you disembark from your flight to make sure you can complete your journey to Belgium, if that is your final destination. Information on arriving in The Netherlands: click. Disembarking in Germany first? Click here for more information. Information on disembarking in France for EU passport holders cannot be found unfortunately.
At this moment there are no restrictions or regulations in place when traveling to Luxembourg.