“Airlines that fly between Puerto Rico and the USA are
American Airlines, Delta, JetBlue, Southwest, United, Frontier, Spirit, and Sun Country Airlines” (source discoverpuertorico .com)
My airline advice is go with the one you trust. Or are willing to take the gamble for a cheap ride.
On our covid-cancelled cruise, we booked flights to Miami using a free-companion ticket on our carrier of choice. Then added a flight on American, Miami-San Juan. I wasn’t enthusiastic about American, but the price and schedule were good. All a moot point when you stay home. But I would make the same choice if price was right.
…It looks like Uber from the airport is now an option (used to be you needed a taxi).
(Did I basically mansplain what
@soniam said? Whoops.)