All-in-one tickets don't exist anymore, but that doesn't mean that the journey itself is impossible. It's just a bit more challenging than it was before the Channel Tunnel opened.
If you want to avoid high speed trains altogether, your journey would look something like this:
- London to Dover Priory: train
- Dover to Calais: ferry
- Calais to Lille: train
- Lille to Brussels: train
To get there, you'll have to...
- Buy a 'London to Calais Day Tripper' ticket from Southeastern.
- This ticket gives you a ride from selected stations in the southeast to Dover Priory (not via HS1), and includes a sailing from Dover to Calais as a foot passenger on a P&O ferry.
- While this is a return ticket, there's nothing stopping you from using it as a single.
- See Seat61.com for more information about this ticket.
- Look at TER Hautes-de-France's website for a journey and tickets from Calais to Lille.
- Be aware, the site is in French only and there's a myriad of tickets available.
- Head over to B-Europe to buy a ticket from Lille Flandres to Brussels (Bruxelles).
- Disregard any itineraries which you might get via Lille Europe, these are high speed trains!
- If you're under 26, it may be worth splitting at Tournai and buying a Go Pass 1 for the journey in Belgium.
Please note, there are no shuttle buses between the railway stations in Dover and Calais and their respective ports. You'll have to arrange transportation yourself, either by calling a taxi or by walking for a while.