Hi, Jill,
According to the planificador at godesalco, it's 580 km from SJPP to Ponferrada, and then gronze tells you it's 260 from Ponferrada to Santiago on the Invierno, for a grand total of 840. (SJPP to Santiago on the Francés, btw, is 798 km according to godesalco, making the Invierno alternative 22 km longer than staying on the Francés).
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