Change at Brussels. Take a Eurostar from London to Brussels. At Brussels change to an Intercity train to Ostend.
Paris, London and Brussels
Fastest way is taking the train from the airport to the Brussels South railwaystation (most of the trains that leave from the airport run to that station) The Eurostar terminal is at Brussels South Railway station (local names: Brussel Zuid & Bruxelles Midi)
Eurostar is the brand name for the high speed trains running London-Paris and London-Lille-Brussels.
Depending on the route - either 2.8 km or 3.3 km.
Eurostar uses the stations: St. Pancras (London), Gare du Nord (Paris), Bruxelles Midi (Brussels) and Lille Europe. Eurostar is the brand name of the company running high speed trains London-Paris and London-Lille-Brussels through the Channel Tunnel. Currently these are the only passenger trains operating through the tunnel. The Eurostar takes 2 hours 15 minutes between London and Paris.
The Eurostar doesn't go to Copenhagen. You will need to go to Brussels or Paris and take a different train.
THe Eurostar does not run from Paris to Brussels. Eurostar is the brand name of the high speed train service from London-Paris and London-Lille-Brussels. The service from Paris to Brussels uses trains branded 'RGV' or 'Thalys'. It takes about 1½ hours.
The Eurostar travels between London and Paris, and between London and Brussels. It does not travel between Rome and Florence.
The Eurostar does not go to Berlin. Eurostar is the brand name of the high speed train service London-Paris and London-Lille-Brussels.
The Eurostar does not go to Barcelona. Eurostar is the brand name of the high speed train service London-Paris and London-Lille-Brussels.
Eurostar to Paris and Brussels.