Narsarsuaq (UAK) is a smaller airport in Greenland. The one and only destination from here is Narsaq (JNS) with Air Greenland where you can fly 2 days a week.
From UAK, you have 1 airline to 1 different destinations

If you are in need of a rental car, there are several options at UAK.
If you are arriving at Narsarsuaq and want to go to the city, you have several options. You can take a bus, a taxi, or a rental car. The bus is the cheapest and most convenient option, as it runs frequently. The taxi is more expensive and may take longer depending on the traffic. The rental car gives you more flexibility, but you have to pay for parking and fuel.