The most up-to-date public transport route maps for Reykjavik and the rest of Iceland are found on the local bus company’s website. They include a pdf map and an interactive map of lines and bus stops in the capital area and a pdf map of routes and stops for the whole of Iceland. The map below is a clickable direct link:
When you’ve figured out which bus line and bus stop you want, you can find timetables for each one on the bus company’s timetable page. Current schedules for Reykjavik city buses, are there, as well as the timetables for buses covering the rest of Iceland.
A very useful Route Planner is on the same website, as well as a helpful User Information page for passengers. It includes details of fares, disabled access, taking bikes on the buses, rules on board, and many other Frequently Asked Questions.
How to use buses in Iceland
Either buy a bunch of tickets at retail vendors or, for a one-off journey, pay in cash as you enter the bus. You need the correct money for this in the capital area as debit/credit cards aren’t accepted on city buses. Enter at the front of the bus and leave at the back. The middle section has space for a few bicycles.