We plan to visit Iceland for 5 days mid October. We have an early morning flight from UK landing in Iceland at around 8:30 A.M. I see we can book the Bus shuttle from Airport to City main bus stand in advance and online.
1) In case the flight is late, are the tickets reusable in a subsequent bus or they are invalid?
2) Is it necessary to buy them in advance or we can buy with Euro/Iceland Kr at the airport bus terminus itself? Not sure if it costs cheaper if we buy online and in advance compared to buying on the day.