You should plan to leave La Digue at least 2 hours before your flight. Check-in at Praslin International Airport is typically required 1 hour before departure (please confirm with Air Seychelles). After arriving in Praslin, you’ll need to take a taxi from the harbor to the airport, which takes around 15–20 minutes and costs about €40.
Note: Taking the ferry from Praslin to Mahé instead of flying can save you both time and money.