Transport options for part Pamplona to Burgos in May on weekends

Hello,
Early May I will walk from SJP to Pamplona and want to continue from Burgos. I thought it would be easy to take a train or bus, but the usual apps like Omio or Rome2Rio show „no trains or buses“.
I must mention that the relevant day would be a Saturday.

Question:
Is it possible that there is a summer schedule which possible has not been published yet? Or is it because it is a Saturday and also later in the year there will not be trains or buses for that route on a Saturday?
And experiences or recommendations?
Thank you!

J Willhaus said:

Probably too early. I just looked for next week using the trainline app and several train connections on a Saturday. One change in Vittoria. If you haven't taken the train before, the station is kind of far from the Camino. The bus is downtown near the Camino. Bus schedules not out yet. Try in April.

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Thank you