London to Bruxelles / Brussels by train

As a consequence of the Covid-19 crisis Eurostar is operating a particularly limited timetable for the time being - further information is available on Eurostar.com

Final Destination: Bruxelles-Midi or Amsterdam

Note that London is in a different time zone to mainland Europe, it is one hour behind - so when looking at a timetable the journey will look as though it's an hour longer.

Most of the departures between London and Bruxelles will be by the e320 trains, but the e3300 trains are usually used on some departures.

The usual calls at either Ebbsfleet or Ashford International stations, have been been temporarily suspended until further notice.
However as the trains only call at these stations to pick up passengers. these station calls are not included on the departure boards at St Pancras International, or usually announced on the train.

Eurostar requests that holders of Standard Class And Standard Premier tickets check-in a minimum of 30mins before departure; though this time increases to 45mins before departure on weekends and holidays.
If you have a Business Premier ticket, Eurostar recommends that you only have to check-in 10 mins before depart

Book early and save: Yes

Online bookings open: Between 138 and 190 days ahead of the travel date

The price shown below is the standard, most heavily discounted, one way Standard Class price - however, Eurostar frequently offers special fare/deals promotions, so the price you see on the home page of the Eurostar website MAY be cheaper.

Also note that on the Eurostar booking site, it only uses the English name of the main station in the Belgian capital - so enter 'Brussels Midi' into its search.

Another big plus of booking the Eurostar direct on Eurostar.com is that you can access a 'Manage Your Booking' facility - which enables you to change the seat that you will have been initially assigned when making a booking.
Click on the 'train guide' for more information on how to do this

As the fabulous Seat 61 explains here in detail (scroll down to 'Choosing A Seat') some seats on Eurostar services are better than others.

The different types of ticket summarised

Also worth knowing is that when travelling by Eurostar you can choose between three classes of service, and this also impacts on the exchanges and refunds of what Eurostar refers to as 'Flexible tickets'

If you book Standard or Standard Premier tickets, you can exchange them if need be, to an alternative departure on your booked route; but if you want to transfer your ticket to a new departure less than 7 days before your travel date, you will need to pay an admin fee of £30 for Standard Class tickets, £40 for Standard Premier tickets PLUS the price difference with the new ticket you will be booking.
What's new, in response to the pandemic, is that these £30/40 charges aren't applied if you want to transfer to an alternative departure more than seven days before your travel date.

Business Premier tickets are less restrictive, in response to the pandemic they can now be refunded and they can be exchanged to alternative departures without paying the admin fee, or the price difference.

Eurostar's full ticket terms and conditions are here

Using Rail Passes on Eurostar:

Rail pass users can now pay reservation fees to travel on Eurostar trains, in a similar manner to other international European high speed trains.

The new rail pass reservation fees are similar to the cheapest single journey ticket prices, but as those cheapest tickets can sell out quickly, it's likely that the rail pass reservation fees will save money.

You can purchase these online with no booking fees via B-Europe - or they ARE now available on the Eurostar website.
Booking in advance is recommended as it's not unknown for rail pass reservations on Eurostar services to sell out days or weeks in advance, there is evidently limited availability per departure.

You can obtain a rail pass reservations without paying a booking fee at Eurostar stations.
However, if you want to do this on the day of travel be prepared to be flexible re: the train you will take.

If you are a UK resident, your rail pass + reservation is only valid if you take a train from the UK on the first day that your pass is valid for and return to the UK on the final day that you will be using a pass.