When is it sinful to miss Sunday Mass?

Sunday mass is so important to me, but I missed attending mass last Sunday.
I was bound to a traveling schedule Saturday evening, Sunday morning, and Sunday evening. On sunday afternoon I was told by another faithful Catholic that we were too far from a church to practically attend before needing to resume our journey.

I’m concerned that it can be all too easy for people to excuse themselves on this important matter, and wonder if its a matter that reuires confession.

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Is there a dispensation from the Sunday obligation while traveling?

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