KTEL Corfu have a bus service from Corfu to Athens three times daily. The bus uses the Aktio Immersed Tunnel and you can get off at Aktio Airport. The cost of a ticket is €10.+ the ferry crossing to Igoumenitsa. It does not call in at Preveza.
This means that people picking you up have only to go to Aktio airport, saving the long trip up to Iggy and back.
The journey time is approx four and a quarter hours, (inc the 2hr ferry crossing).
If no one is picking you up, the bus between Preveza and Lefkas runs six times a day Mon-Sat (only twice on Sundays) and it runs past Aktio airport.
Bearing in mind the useless bus schedule between Igoumenitsa and Lefkas, this could be a viable solution
The relevent timetables can be found on the following two links:
http://www.ktelkerkyras.gr/?module=default&pages_id=35&lang=en
http://www.ktel-lefkadas.gr/?module=default&pages_id=26&lang=el
