For booking go to Travel.covid.is
On this site you can only book the test in Reykavík, but you can use the barcode you get tested on HSU (see below Selfoss, Vestmannaeyjar or Höfn) on our opening hours for testing. You need to pay for the test. Icelanders as well as tourists can book the PCR test and then receive the certificate through a text message as soon as the results are available. Answers can take up to 24 hours to be received if you are tested in Höfn or Vestmannaeyjar.
On weekends there is no testing at HSU, only at Suðurlandsbraut 34, Reykjavík.