London to Aix - en - Provence by train

The Eurostar will arrive in Paris at the Gare Du Nord, but the train to Aix-en-Provence TGV will depart from the Gare De Lyon.

This guide explains how to make the transfer between the two stations by RER train.
Note that if you take the Eurostars which depart London at 12:31 or 14:31 (daily) and 11:31 (Sundays), you will only have 50 minutes to make the connection into the train leaving the Gare De Lyon; this only allows around 20 minutes contingency for any delays or confusion.

Or avoid the need to make your own way across the French capital by making a connection between trains at Lille Europe station; see below.

Book Early And Save: Yes

Online bookings open: 90 days ahead

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, or are happy to set off from London early in the morning.
 
The price shown below is the standard, most heavily discounted, one way Standard Class price.
Eurostar frequently offers special fare/deals promotions, so the price you see on the home page of the Eurostar website MAY be cheaper.
But check the terms and conditions of any special deal BEFORE making a booking. The special price MAY depend on additional factors, such as the need to book a return trip and/or MAY not be available when making day trips.
Eurostar's full ticket terms and conditions are here

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 on the Eurostar, that you will have been automatically assigned when making a booking.
Click on the Eurostar 'train guides’ for more information on how to do this.

Exchanging 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 .

If you book the end-to-end journeys with a 50 min connection across Paris and a delayed arrival of the Eurostar into Paris causes you to miss the onward connection, you will be able to exchange tickets to a later departure.

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.

Making the connection between the Eurostar from London and the TGV to Aix-en_Provence at Lille Europe has the major advantage of avoiding the need to transfer between stations in Paris.

You'll have to make your own way across the city if you choose the alternative train journey option via the French capital.

This guide explains how to make the connection in Lille-Europe station.

Book early and save: Yes

Online bookings open: 90 days ahead - usually

The search results for the London to Aix-en-Provence journeys on these ticket agents, combine this journey via Lille with the alternative connections via Paris.

The journeys which offer the connection in Lille are the 11:04 daily departures from London.

The 11:04 departure from London will typically have a 36 min connection in Lille into a train on to Aix-en-Provence TGV station - pretty much ideal if the Eurostar arrives from Lille on time, and only very exceptional circumstances will prevent this from occurring.

In the event of a delay tickets can be transferred to subsequent departures by TGV InOui trains, though Saturdays excepted, there won't be another departure from Lille Europe to Aix-en-Provence TGV for more than four hours.