Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to Pietermaritzburg as you normally would.
If you book a flight to Pietermaritzburg from Washington, D.C. Dulles Intl, you will be flying to Pietermaritzburg, which is the city’s only airport. Pietermaritzburg (PZB) is located 1.8 mi from the center of Pietermaritzburg. There are 0 flights from Washington, D.C. Dulles Intl to Pietermaritzburg per day from 0 different airlines.
This is defined as Washington, D.C. Dulles Intl Airport (IAD) and Pietermaritzburg Airport (PZB). Codes like Pietermaritzburg Airport are often used to just call airports uniquely.