Originally Posted by
IAHRyan
One hour should be enough as every terminal is connected airside by both walkways and a train system. Coming in from SEA you’ll land in either C or E and CUN flights leave from E, which is not a long walk at all.
Technically, not true, to switch to A (heck, even to go to the other end of A) one must take the shuttle bus on the Tarmac.
That said, I doubt the OP is using terminal A, I agree that 1 hour should be enough.