Getting to Saba: Only one airline (Winair) flies to Saba (SAB), and then only from St. Eustatius and St. Maarten. You can also take The Edge or Dawn II ferries from St. Maarten; the trip, which takes more than an hour, can be rough and costs $60 round-trip. The ferry schedules are geared to day-trippers, so you must spend a night before and after your Saba stay on St. Maarten.
Hassle Factor: Medium-high.
Nonstops: None.