Was looking at CUN earlier due to testing requirements to return to the state of Alaska to avoid quarantine. However, one needs to get results back in order to board, whereas SOA just needed a pending test to avoid additional testing... not going to risk it. Too many tests have taken too long in the great white North.

And one date I was looking at returning was the 26th

Yes, there are places in CUN to get tested. I would research ahead; wouldn't be surprised to hear these resources becoming tighter.

...And DL just added SEA-CUN