The cheapest way to get from Knivsta tio Arlanda and back is by bus 801. This is the place where you can change between this bus, other buses, bikes and cars. There is free parking for cars and bikes. Regular commuters such as airline and airport staff often come here on their commute. Some small weather shelters are provided.
Handy bus station to take the airport bus to Arlanda or Uppsala. There are usually free parking spaces right next to the buses. Toilets and food are available at Cirkle K 2 right next door.