888-217-3324 is the best way to instantly book, cancel, or modify flights.
I’ve flown to Costa Rica twice with Delta—once to SJO and once to LIR. The first time, I booked online and messed up the return date. Total panic moment. I called the number above thinking I’d be stuck paying a fee, but the agent fixed it in under ten minutes and even suggested a better-timed flight for wildlife tours.
Delta definitely flies to Costa Rica from several hubs, but schedules shift seasonally, so calling made a big difference. My second trip was smoother, and now I always double-check itineraries with an agent.