Paris to London to Brussels:should I fly or take the train & which train should I take?

Eurostar trains are the best. Go from Paris to London, then London to Brussels. Don't buy tickets until you have fixed dates, but try to do that as early as possible. A few highly discounted tickets are sold for every train, usually 120 days in advance. They are nonchangeable, nonrefundable and a bargain. Prices go up as tickets are sold.

The train stations are in the cities, while the airports are miles away, so it's both time-consuming and expensive to get to them. You only need be at the train station an hour before departure, and you don't have to wait around to collect your luggage when you arrive.

When you book on Eurostar, be sure to use their website. You may have to change your home country to UK or something - it doesn't matter for purchasing, but the site may not work well otherwise. If you want to spend a couple of days in Belgium, you may want to visit (and stay in) either Bruges or Ghent, both are easy train rides from Brussels. Then, when you book the train from London to Belgium, choose "any Belgian station" - then you can continue on a local train from Brussels Central Station to any city you choose.

Ok, thank you I will go ahead with booking the train tickets.

Thanks,
Dmoy