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I think the train would be cheaper than the plane but you'd rather check it. I have been in Paris for several times so there's some tips for you: 1.take metro rather than taxi, they are cheaper 2.be attentive to your purse as there are many pickpockets 3. take a museum pass to visit some of the museums for free For more of these, read my article on the following blog: https://tripplannera.com/blog/paris-tips-facts-secret-things/ You can find some really useful tips.

I think 4 days will be enough for Paris. You would certainly find trains going from Brussels to Paris and they will be much cheaper than taking plane. Just search in the internet. I found this one: https://www.raileurope.com/popular-routes/paris-to-brussels.html?country_origin=AM Is this your first trip to Paris? If yes, then there are some must-see places like Tour Eiffel and Champs Elysee's. You just need to plan your time right to manage to visit as many sites as possible. You can find some useful tips about Paris in my article. Take a look at it, it may help you somehow: https://tripplannera.com/blog/paris-tips-facts-secret-things/

• Name / URL TripPlannera : https://tripplannera.com/
• Location of Your Headquarters USA/Armenia
• Elevator Pitch/Explainer Video TripPlannera is a personalized itinerary planner, which combines all kind of travel activities into one dashboard (attractions, restaurants, tours,local events, etc,,) and provides editable itineraries created by smart planner or professional guides. All itineraries are free to use (even offline) and travelers can book activities they want from it.
• More details: We are live since December 2016. We are a team of 11 professionals.
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I suggest you to input your itinerary list to planning tools like this https://tripplannera.com/itinerary-paris-for-4-days-1, it will show you how optimal is your route, how is the load, etc.. so you can adjust it.