Getting to Ofu means flying from Pago Pago on Tutuila. Inter Island Airways operates small twin-engine planes on the route, and the flight takes about 30 minutes — assuming it goes. Weather cancellations are frequent, sometimes leaving travelers stranded on either end for a day or two. Book as far in advance as possible, confirm the day before, and build extra time into any itinerary that includes a connecting flight out of Pago Pago. The runway at Ofu Airport is short and the approaches are over water and ridgeline; pilots here are practiced, but conditions matter.
Flights are limited to a few per week and seats are few. If your dates are fixed, book early and check the airline's current schedule directly — it changes seasonally. On the island itself there are no rental cars; accommodation hosts may be able to help with transport, and the distances involved are small enough that walking covers most of what you'll want to see. The NPS Ofu unit campsite is within easy walking distance of both the beach and the airstrip.