Basel / Bâle to London by train

Take this route via Paris and you will need to make the transfer between the Gare De Lyon, where the Lyria train will arrive, and the Gare Du Nord, from where the Eurostar will depart.

On the current adjusted timetables the first four departures of the day to Paris all connect into Eurostatr trains on to London, which depart from the Gare Du Nord 1hr 35 mins after the Lyria train will have arrived into the Gare de Lyon.
These schedules should ensure a comfortable transfer, as they have around 45mins of contingency time to allow for a delayed arrival into Paris, which is rare on this route, and if the trains are on schedule, you'll be in the Eurostar departure lounge around 30 mins before the train to London will be leaving.

However, despite that, at the current time, the ticket agents don't seem to be offering these combinations of trains, Lyria to Paris + Eurostar to London, as an end-to-end journey available in one transaction.

The alternative connections

(1) The majority of the journey options currently on sale involve making an additional connection in Strasbourg; because both the TER (non high-speed) trains between Basel and Strasbourg; and the TGV trains on from Strasbourg to Paris are operating close to their usual schedules.

(2) A routing which is more than 2hr 30mins slower travelling via Paris is available, but it avoids having to make a transfer across the French capital.
It is also a good option for users of Eurail and InterRail passes, because it avoids the comparatively expensive fees which rail pass users have to pay on the Eurostar trains.
It involves taking:

• the 13:13 ICE train from Basel to Koln
• the 17:43 ICE train from Koln to Bruxelles-Midi
• the 19:35 Eurostar from Bruxelles-Midi (1hr 20mins to make the transfer)
  Though this routing into the final connection of the day on from Bruxelles to London is dependent on making a 38 min transfer between trains at Koln Hbf, so the ICE from Basel will need to be there within 35 mins of its booked arrival.

Book Early And Save: Yes

Online bookings open: 4 months ahead

Trainline will also sell journeys with alternative combinations of trains; so take care when booking.

You're looking for the journeys with '1.correspon' that involve taking the TGV Lyria from Basel SBB*to Paris.
*Select Basel SBB when looking up this journey.
Though when SMTJ most recently looked up this journey this routing wasn't available as an end-to-end booking, despite the necessary trains being scheduled.
So if you want to make the journey via Paris in around 7 hours, separate bookings per train may be required.

The very cheapest tickets tend to sell out particularly quickly on this route; they're more likely to be available if you can travel on a Tuesday - Thursday and are happy to set off from Basel in the morning.

Eurostar does not sell tickets for this journey.