Unless you have a car, the best way to get to Ærø is the ferry from Svendborg to Ærøskøbing. Through June 2012, ferries will depart Svendborg Monday-Friday every 3 hours from 07:15 until 19:15, with the final ferry departing at 22:30. On most weekends, the 07:15 ferry doesn't run. Travel time is approximately 1 hour 15 minutes. The return trip from Ærøskøbing departs Monday-Friday every 3 hours from 05:45 until 20:45. The 05:45 ferry does not run on Saturdays and most Sundays. Service is further limited around Christmas and New Year's Day.
Updated Fares: As of 26 June 2011, passenger fares are DKK 118 per adult 1-way, DKK 184 round trip. Children cost DKK 72/DKK 103, while Seniors are charged DKK 87/DKK 131. If you're taking a car, passage is an additional DKK 255 one-way, DKK 406 round trip, reservations are highly recommended but at no charge. Walk-on passengers need not make reservations. Group and multi-ride deals are available; check the website for details.
Once you are in Odense and that you start early morning and want to make use most of your time exploring few sites in Fyn including Egeskov castle on the way to Svendborg and then on to Ærø, you may buy so called day-ticket (dag-billet) from the bus-chauffer. The ticket also includes a return ferry trip to Ærø and vaild until midnight. So it matters how early you can start. For price-info in DKK, click the weblink below.
There are different ways to come to Aero. If you come from Germany, you can take a ferry from Mommark to Soby and then go by bus to Aeroskobing. On the website www.aeroe-ferry.dk you will find all information - prices, timetables of ferries as well as buses.
If you come from the opposite direction than Germany, i.e. from mainland Denmark, you should take a ferry from Svendborg to Aeroskobing, from Faaborg to Soby or from Rudkobing to Marstal.
If you go to Aero from Copenhagen by public transport, there are also 2 ways. You can go by train to Nyborg and then change it to bus going to Svendborg. But the best way I suggest is to buy the ticket by internet in advance (not earlier than one month before, but not later than one week left till you journey), then you can travel from Copenhagen to Svendborg (changing the train to another in Odense) much cheaper! It will cost you 135 DKK instead of about 200DKK. Website: www.dsb.dk and then go to DSB Orange.
Too much information, but maybe somebody will need it :)
Like most parts of Denmark, Ærø is also a biker's paradise where you can get to stop whereever yo want and have a closer view of this lovely island.
There is no apparent bike-rental so bring your own!
Once you are in Svendborg, you need to take a ferry. An early departure means you can have enough time to walk around and may come back to Svendborg and even take the connections to Odense for your next destination unless you plan to stay overnight. For more info. on ferry-connections look on the website below.
There are daily car ferries from Funen and Faaborg to Søby, a port town at the western end of Ærø. A less frequent ferry to Søby departs from Monmark in Jutland. Ærøskøbing in central Ærø is serviced by ferries from Svendborg. Ferries run to Marstal, a port town in eastern Ærø from Rudkøbing (Langeland), and also from Kiel in northern Germany.
During summer this part of the Baltic sea is busy with private boats, such one we are seeing from the ferry.
Ærø lies at the southern edge of Fyn. First, you come to Odense either from Copenhagen or Århus by train from where you can take train connection to Svendborg or you can take buses to Svendborg. The bus-stop is adjacant to the rail station.