You’ll want to get to San Sebastián. From there it’s an easy bus ride across the border to Biarritz.
When I did it I met a quartet of Americans en route to Lourdes who had dropped off their Spanish rental car and were busing to France to pick up another car. They were four and, I’m pretty...
Unless something has changed, you just pay onboard. Price a few years back was 1 euro.
https://www.bayonne-tourisme.com/en/getting-around/getting-around/bus-service-chronoplus.php
I’ve done this a few different ways and would recommend a night in Bayonne/Biarritz en route to SJPP if you can spare the time. Take a few deep breaths and get a good night’s sleep. Then a great first day by train and on foot to Orisson.
Bill (also Boston)
It's hard to stop in "small" and/or "quaint" towns while traveling the major train routes. But an overnight or two in Bayonne would work nicely if you took the local bus to explore Biarritz or the local train to idle away a few hours in St. Jean de Luz. There's something especially nice about...
There's no need to make this difficult. You'd return the car where you can return the car. Bayonne or Biarritz.
And my point would be to experience something more than "whizzes". You can do that on YouTube.
Is renting a car and driving yourselves out of the question?
Once you're out of Paris it's really not difficult. And that's the way to do more than "see" the countryside through the window of a train or bus. Stay in country inns in small towns, stretch your legs when the scenery calls to you...
Where are you starting out from? Do you anticipate jet lag? I realize you may be pressed for time, but taking a day in Biarritz or Bayonne to adjust may be to your advantage.
I'm assuming the flights are a bad option in the first place.
I guess I've not experienced the delays at CDG that others have. I've always gotten processed off and continued on my way easy peasy. Karma?
Don't see why 10:36 isn't an option. And the ten minutes in advance is a suggestion that I've never seen make any difference at all.
And you can buy a ticket in advance. And at that hour on a Saturday you'll beat the 75 minute trip time.
And I've advocated above not trying to reach SJPP on...
My relax strategy would be to take a train from CDG and enjoy a relaxing dinner in Biarritz or Bayonne or even Bordeaux. SJPP isn't going anywhere. If you can afford the time, that is.
You won't have any trouble catching the 6:06 from Bayonne. Note that Biarritz/Bayonne are one conglomeration and the distance from the airport to the Bayonne station is 15 minutes by taxi and will cost far less than $132 each. You'll likely have time to take the bus rather than a taxi.
Others...
As you can from the answers above, you have options depending on expense, time, and the number of connections.
I'd ask: are you eager to hit the ground running, as it were, or does allowing time to recover from jet lag make sense. I'd recommend Bayonne/Biarritz for a day or two like that.
On a...
I believe that gets you the minimum: a spot in a cabin with 6 berths, facilities outside the cabin. You can pay more to share a cabin for 4 or 2, with its own sink, etc.
The potential of traffic delays varies with with day and time of day. Saturday and Sunday mornings are very different from weekdays. I'd plan differently depending on exactly when I'm arriving, and I'd make a recommendation on that basis as well.
Santiago to A Coruna: generally 7 Euros
A Coruna to Madrid overnight: 52 Euros
Compared to paying 31 or 35 or more (depending when you purchase etc) for the daytime trip from Santiago to Madrid.
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