Statistically, probably the drive to the airport.
On the Camino itself, the biggest danger is exposure. Cold weather at high altitude, Hot Weather in the Meseta as examples.
Challenging? Yes, some of the mentioned sections. especially with rain or frost. The final descent to Molinaseca is a good candidate.
Dangerous? Nope, not really, but this is quite subjective. I would reserve this word for the stage from SJPP to...
Skipping SJPDP to Panplona is skipping over some of the most beautiful countryside, the best food, and the community spirit of starting out as a group. The section coming into Burgos would be a much better stretch to bus over. The messeta that...
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