On May 15 my son will need to take the ferry from Korcula to Split to make a 13:00 airflight leaving from Split airport.
On the morning of 5/15 there is a Krilo catamaran 6:00 departure, arriving Split at 8:30. Is it advisable to purchase tickets online now versus waiting until arrival in Korcula (arrival 5/13).
He maybe ok waiting, but if he knows what catamaran he will be on, why not book now?
Personally, I would not risk getting from Korcula to Split for a 1pm flight. I would stay in Split or Trogir the previous night. When I was there in September, the catamarans were cancelled for 2 consecutive days due to high winds. What if this happens 15 May? No time for a plan B.
"Personally, I would not risk getting from Korcula to Split for a 1pm flight."
Ditto.
I'm quite happy to take risk if that has a reward(happily travelled to countries that most people hear only in the news), but one thing I can't afford(literally) to risk is missing my homebound flight.
Always spend the last night before the flight in or close to the departure city.