Beautiful day ,the route to keilir lies from Vogar Vatnsleysustrond which is between Reykjavik the capital of Iceland and Keflavik.. once we got to the parking space it is 6-8 kilometers walk from there to the mountain and a bit of that is over old Lava .. it was windy and the mountain is steep but taking small steps up the mountain and a lot of breaks (a bit of loose gravel )should get you to the top :)