How to take a thrilling high speed rail journey from London to Rennes

At St Pancras:

Eurostar is currently suggesting that Standard Class And Standard Premier ticket holders should be at the Eurostar departure area in St Pancras International 90 mins before departure; and that Business Premier ticket holders should be there 45-60mins prior to departure.

The departure gates will close 30 mins prior to departure for Standard Class And Standard Premier ticket holders; and 15 mins prior to departure for Business Premier ticket holders.

Our guide to taking a Eurostar from London is here.

Note that London is in a different time zone to mainland Europe, it is one hour behind; hence what can seem like a discrepancy between the journey time and the interval between the departure and arrival times.

Departing from the Gare Montparnasse

The Eurostar will arrive in Paris at the Gare Du Nord, but the train on to Rennes will depart from the Gare Montparnasse

This guide explains how to make the transfer between the two stations on the Paris Metro.
What's good to know is that the journey from stepping off the Eurostar to being on the concourse at Montparnasse will typically take around 40 -45mins - but it is not step-free.

The journey options sold by the ticket agents allow between around 1hr 10mins to 1hr 35mins between arrival and departure from Paris - and this isn't always reflected by the overall end-to-end journey time.

The easier public transport alternative is to take bus line/route 91*
Though you will need to allow at least an hour to make the journey.

Travelling via Lille vs travelling via Paris

Or an option is to target the alternative journey options involve changing trains in Lille
The big tick in the box for changing trains in Lille is the avoidance of the awkward transfer across Paris.

Though there are also three ticks in the box for choosing this routing via Paris:
(1) More departures to choose from
(2) Tends to be cheaper
(3) The end-to-end journey time is quicker

Taking a Ouigo train on from Paris

When departing London at around 07:00, the connection on from Paris will be into a low cost, but more basic, Ouigo train service.
Travelling by Ouigo is supposed to be a cheaper alternative to taking a regular TGV InOui service, so if the price isn't comparatively cheap, it's best to avoid this journey option.

Book Early And Save: Yes

Online bookings open: up to 6 months ahead of the travel date
This booking period tends to be shorter when looking up journeys between mid August and mid October.

Seat reservations are automatically included when booking tickets for both trains.

Your ticket will not include the Metro train across Paris from the Gare Du Nord to the Gare Montparnasse.

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.

Eurostar train's general ticket terms:

'Customers can exchange tickets for travel in Standard and Standard Premier class multiple times without paying an exchange fee, as long as tickets are exchanged 7 days or more before the departure time of their individual journey
Though if the new ticket option is more expensive the difference in price will need to be paid, but if it is cheaper the price difference won't be refunded.
But make the exchange within 7 days of the individual journey and an admin fee of £30 will need to be paid, along with the price difference
Tickets to travel in Standard and Standard Premier class are not refundable.
In contrast tickets to travel in Business Premier Class can 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 .

General ticket terms for TGV InOui trains

The terms on SNCF Connect state:
'Tickets can only be exchanged (adjustment to the current fare) and refunded prior to departure: 40% of the price 6 days prior to departure (€15 max fee). From 30 minutes prior to departure, tickets can be exchanged up to two times (for the same day and the same journey), and are non-refundable after the first exchange'.
Which could be clearer, but it seems as though the three key things to be aware of are:

1. Exchanges and refunds are free up to 7 days before departure.
2. If you are travelling on a TGV InOui train and want to amend your booking in the 6 days before departure, you must pay an amendment fee of €19 per person per person for an exchange or a refund.
3. In the 30 minutes before departure, refunds cannot be requested and exchanges are only allowed for the same journey later that day. The same amendment fees apply to the exchange.

Making the connection in Paris:

There is relatively new E.U. legislation which protects travellers against financial loss in the event of missed connections due to train delays, but it only applies to 'through tickets'.
The Eurostar terms and conditions specifically state that when booking journeys which combine Eurostar + Eurostar Thalys trains 'through tickets' will be issued.
'However, 'for all other journeys that combine a Eurostar Service and a service provided by another carrier (such as the TGV on from Paris) including when purchased in a single commercial transaction, those tickets will be separate contracts and issues regarding delays, missed connections, cancellations, compensation, and the management of aftersales will be handled accordingly'.

But SNCF, which operates the train on to Rennes, has signed up to Agreement on Journey Continuation (AJC) policy for when a traveller holds separate transport 'contracts' for an end-to-end journey involving more than one train.
So this agreement applies both when 'a bundle' of tickets / contracts is issued as the result of a single transaction - and if travellers have bought several different tickets for their journey, even from different sales channels/ticket providers.
As long as the passenger had planned enough connecting time to change trains (called “reasonable connecting time”), the AJC will apply.

So in usual* circumstances, if a delay to a Eurostar has caused a booked connection on to Rennes to be missed, replacement tickets/reservations should be issued at the Gare Montparnasse.
*= But that new E.U legislation specifically states that in exceptional circumstances, the train operators do not need to issue replacement tickets - and the terms and conditions on the SNCF Connect website reiterate this.
These exceptional circumstances specifically stated in Regulation (EU) 2021/782 of the European Parliament include:

• extraordinary circumstances not connected with the operation of the railway, such as extreme weather conditions, major natural disasters or major public health crises...
• ...the behaviour of a third party... such as persons on the track, cable theft, on-board emergencies, law enforcement activities or sabotage.

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 on B-Europe
Booking in advance is recommended as it's not unknown for rail pass reservations on specifc Eurostar services to sell weeks in advance, there is evidently limited availability per departure.

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.

The routing via Lille making a London to Rennes journey involves taking the Eurostar, which typically departs London daily at around 13:00 and is due to arrive in Lille at 15:25.
There is a daily TGV from Lille Europe station on to Rennes which is usually scheduled to depart at around 17:40, but because the transfer time in Lille between trains will more than two hours, the ticket agents usually won't offer this combination of trains.

But if you would prefer to wait in in Lille than make the transfer between the Gare du Nord and the Gare Montparnasse in Paris, then an option is to book separate tickets for the London to Lille and Lille to Rennes journeys.
The transfer time of around two hours means that a missed connection due to a delay, is a very unlikely scenario.

At St Pancras:

Eurostar is currently suggesting that Standard Class And Standard Premier ticket holders should be at the Eurostar departure area in St Pancras International 90 mins before departure; and that Business Premier ticket holders should be there 45-60mins prior to departure.

The departure gates will close 30 mins prior to departure for Standard Class And Standard Premier ticket holders; and 15 mins prior to departure for Business Premier ticket holders.

Our guide to taking a Eurostar from London is here.

Note that London is in a different time zone to mainland Europe, it is one hour behind; hence what can seem like a discrepancy between the journey time and the interval between the departure and arrival times.

Neither the Eurostar website, or any other ticket booking site, seems to offer this journey option for an end-to-end booking.

Though if this would be your preference click here for our guide to the London to Lille journey and here for the guide to the Lille to Rennes journey.

Book Early And Save: Yes

Online bookings open: up to 6 months ahead of the travel date
This booking period tends to be shorter when looking up journeys between mid August and mid October.

Seat reservations are automatically included when booking tickets for both trains.

Eurostar train's general ticket terms:

'Customers can exchange tickets for travel in Standard and Standard Premier class multiple times without paying an exchange fee, as long as tickets are exchanged 7 days or more before the departure time of their individual journey
Though if the new ticket option is more expensive the difference in price will need to be paid, but if it is cheaper the price difference won't be refunded.
But make the exchange within 7 days of the individual journey and an admin fee of £30 will need to be paid, along with the price difference
Tickets to travel in Standard and Standard Premier class are not refundable.
In contrast tickets to travel in Business Premier Class can 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 .

General ticket terms for TGV InOui trains

The terms on SNCF Connect state:
'Tickets can only be exchanged (adjustment to the current fare) and refunded prior to departure: 40% of the price 6 days prior to departure (€15 max fee). From 30 minutes prior to departure, tickets can be exchanged up to two times (for the same day and the same journey), and are non-refundable after the first exchange'.
Which could be clearer, but it seems as though the three key things to be aware of are:

1. Exchanges and refunds are free up to 7 days before departure.
2. If you are travelling on a TGV InOui train and want to amend your booking in the 6 days before departure, you must pay an amendment fee of €19 per person per person for an exchange or a refund.
3. In the 30 minutes before departure, refunds cannot be requested and exchanges are only allowed for the same journey later that day. The same amendment fees apply to the exchange.

Making the connection in Lille:

There is relatively new E.U. legislation which protects travellers against financial loss in the event of missed connections due to train delays, but it only applies to 'through tickets'.
The Eurostar terms and conditions specifically state that when booking journeys which combine Eurostar + Eurostar Thalys trains 'through tickets' will be issued.
'However, 'for all other journeys that combine a Eurostar Service and a service provided by another carrier (such as the TGV on from Lille) including when purchased in a single commercial transaction, those tickets will be separate contracts and issues regarding delays, missed connections, cancellations, compensation, and the management of aftersales will be handled accordingly'.

But SNCF, which operates the train on to Rennes, has signed up to Agreement on Journey Continuation (AJC) policy for when a traveller holds separate transport 'contracts' for an end-to-end journey involving more than one train.
So this agreement applies both when 'a bundle' of tickets / contracts is issued as the result of a single transaction - and if travellers have bought several different tickets for their journey, even from different sales channels/ticket providers.
As long as the passenger had planned enough connecting time to change trains (called “reasonable connecting time”), the AJC will apply.

So in usual* circumstances, if a delay to a Eurostar has caused a booked connection on to Rennes to be missed, replacement tickets/reservations should be issued in Lille Europe.
*= But that new E.U legislation specifically states that in exceptional circumstances, the train operators do not need to issue replacement tickets - and the terms and conditions on the SNCF Connect website reiterate this.
These exceptional circumstances specifically stated in Regulation (EU) 2021/782 of the European Parliament include:

• extraordinary circumstances not connected with the operation of the railway, such as extreme weather conditions, major natural disasters or major public health crises...
• ...the behaviour of a third party... such as persons on the track, cable theft, on-board emergencies, law enforcement activities or sabotage.