Limousine bus from Kameari Station to Haneda Airport.
The bus stop is here. It is right outside the station. Please refer to this page if you are a resident of Tokyo.
There are quite a few passengers. I often see people standing in line with suitcases. Please use this as a reference.
When the bus arrives, the driver will ask you if you have a bag to check in. If you are taking an international flight, say “international flight.
The fare is paid in advance. The fare is 1130 yen for adults.
The train stops at Kameari Station – Ichinoe Station – Kasai Station – Haneda Airport in that order. Most passengers use the train between Kasai Station and Haneda Airport.
It takes about one hour to get to Haneda Airport, but there are only a few trains, so you may need to kill some time.