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confusing seat booking system

  • July 24, 2026
  • 6 replies
  • 25 views

When I try to book seats for St Pancras to Narbonne I found a very cheap seat but when I tried to pay the cost changes and increases. I also tried to book another seat on another train and that train has no seats available even though it was showing availability. 
 

here are 2 screenshots of the 2 seats I have tried to book. Can I get an explanation as to why this is happening? Thank you 

 

 

 

 

Best answer by Siobhan Collett

Great thank you. Which website do I book seats to Lille? And can I go one way to Lille and return from Paris?

 

 Ok.  
 

I have sorted this now. Thank you for your help. 

6 replies

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  • Railmaster
  • July 25, 2026

Interrail is not the best place to book reservations.

Use this page as a guide:

https://www.seat61.com/interrail-and-eurail-reservations.htm


  • Author
  • Full steam ahead
  • July 25, 2026

Ok thanks. The system seems set up to make it very stressful. I have paid for the pass and now I see there is no trains at the time I need in order to arrive Narbonne the same day I leave London. I have been researching this all week. If interrail is not the place to book tickets why do they advertise or indicate that it is? Why not put this link up as you have? This shows there’s no trains from London St Pancras to Paris in the morning of 10.8.26. Any suggestions? Thank you for your help. 


  • Author
  • Full steam ahead
  • July 25, 2026

I have looked at seat 61. I can’t find clear guidance on how to book from st Pancras to Paris and onto Narbonne on 10.8.26. I am being guided to Eurostar to pay £180 for the train I want. I have an interrail pass but this is not available on the Eurostar app. Please would someone give guidance to where I might obtain the seats I tried to book last night. 


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  • Railmaster
  • July 25, 2026

The pass is your ticket. You don't need to buy any other tickets for trains covered by the pass. You do need reservations for some trains, such as Eurostar.

You can buy pass reservations anywhere you like and this has always been the case. Interrail doesn't hide that. They show multiple options in the Rail Planner app and on their website. You can also check availability before buying a pass. The overview on Seat61 is just better because it proposes the best websites depending on country and train.

Eurostar is the only train service with limited pass holder seats and during summer they are very busy, which means pass holder seats can sell out several weeks in advance. On 10/8, the first train to Paris with availability is the 16:01 from London, which is indeed too late for reaching Narbonne the same day, but you could take the night train from Paris Austerlitz, arriving in Narbonne at 7:35 on 11/8.

Alternatively, you could book the 7:04 to Lille Europe, arriving there at 9:26. Then the 11:00 TGV to Lyon arriving 14:00 and the AVE from Lyon at 14:35 arriving in Narbonne at 17:18.


  • Author
  • Full steam ahead
  • Answer
  • July 25, 2026

Great thank you. Which website do I book seats to Lille? And can I go one way to Lille and return from Paris?

 

 Ok.  
 

I have sorted this now. Thank you for your help. 


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  • Railmaster
  • July 25, 2026

The Seat61 page explains where you can book seats.

Rail Europe is a good place to book the trains I mentioned. Just remember to set currency to euro to avoid their 5% mark-up for other currencies. If it does find your trains in one go, then look for them separately.

You're entirely free to determine which trains you use.