Below is slightly old information I wrote for the forum awhile back but generalized anyway. See note #2.
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3.5.1 ALSA/CONDA to St. Jean Pied de Port
The bus service between Pamplona to St. Jean Pied de Port is provided by CONDA, a bus company serving Navarra.
You may see in various place on the web that ALSA is the bus line serving Pamplona to St. Jean and in other places that CONDA is the provider of this service. CONDA is partially owned by ALSA, a larger Spanish bus company (which, in turn, is a subsidiary of the UK company National Express). So whether the bus line is called ALSA or CONDA you get the same schedule, fare and service.
There is daily service from Pamplona to St. Jean when in season and no service at all during the winter months (daily includes Sundays and holidays.) For 2018 the season of service was from March 3 to October 21. During the season extra trips are added and removed depending on historical demand.
The trip takes one hour and 45 minutes and costs 22€.
Roughly the ALSA/CONDA schedule has been:
Jan No service
Feb No service
Mar 14:30
Apr 14:30 17:30
May 14:30 17:30
Jun 10:00 14:30 17:30
Jul 10:00 12:00 14:30 17:30
Aug 10:00 12:00 14:30 17:30
Sep 10:00 14:30 17:30
Oct 14:30 17:30
Nov No service
Dec No service
The ALSA website in English is at URL
https://www.ALSA.es/en/ and the CONDA schedules are incorporated there. Besides getting the schedule CONDA tickets can be bought online ahead of time from the ALSA website as well.
Note 1: When using the ALSA website to book transportation to St. Jean Pied de Port you must spell out St. in full as Saint or the town will not be found.
Note 2: ALSA does not load its full schedule into the website all at once. I think they publish the schedule only for the next two months. This means that if you try to book a trip through the website for a date later in the year (e.g., trying to book an October 2019 trip in July 2019) the schedule may not be found. This also means that during the winter months the website will make it look as if there is no service at all.
Note 3: ALSA may refuse to accept non-Spanish issued credit cards. In that case the tickets can be paid for using PayPal. Alternatively they could be bought from a reseller.
Note 4: CONDA has a webpage with a schedule. Do not trust this schedule. The last time I checked it had the 2015 schedule. When the webpage is served up it is labelled at the bottom with the date that the webpage was served (not the creation date or date of validity) thus making the information appear to be current. This page is at
http://www.CONDA.es/eventos.php?tipo=3&id=438 See appendix xxx below.
Note 5: The ALSA/CONDA website can be used to buy a Pamplona to St. Jean ticket or a Roncevalles to St. Jean ticket but you cannot buy a ticket for just the Pamplona to Roncevalles portion of the trip. The Artieda bus company has the license for that.
Suggestion:
During the months of July and August I suppose you could take Artieda's coach in the morning (see below) to visit Roncevalles and then later connect to St. Jean through CONDA's service from Roncevalles. So, if you are a slow hiker and cannot walk from SJPdP to Roncevalles before dark, you still will have had time to see Roncevalles the day before.