Flight connections:

Basel/Mulhouse (CH/F) is the closest airport with good bus connection, cheap airline are www.easyjet.com, besides many others.
Important: Leave the airport building through the French exit; there is a direct bus to Freiburg/Breisgau main station.
The bus leaves every 90 min, and takes 60 min to Freiburg. Bus information under: www.freiburger-reisedienst.de (Airport Bus), or telephone: 0049 -(0)761 - 500 500.
Or use: www.flixbus.de
Airport info: www.euroairport.com

Frankfurt is the most important and nearest international airport, about 2,5 h by fast train (ICE). Many international airlines serve this airport. There are direct trains from the airport (Frankfurt Flughafen) to Freiburg/Breisgau main station every hour. See www.bahn.de.
Airport info: www.frankfurt-airport.com.

Frankfurt/Hahn (~ 4 h away from Freiburg/Breisgau) has only a few airlines and is 1h by bus away to Frankfurt airport and the train connection (plus another 2,5h to Freiburg). Therefore it needs time.
Airport info: www.hahn-airport.de

Baden Airport (~ 1,5 h away from Freiburg/Breisgau). Small airport with a few cheap flights www.ryanair.com. (For the flights from London there is a direct bus to Freiburg only on workdays). Another option is to take a bus to Baden-Baden main station and then the train to Freiburg.  Trains: www.bahn.de. The "Baden-Württemberg-Ticket" might be interesting if you are more than 1 person travelling (see below travel by train!)
Airport info: www.badenairpark.de

Airport Stuttgart is about 2,5h from Freiburg/Breisgau. Here you take the S-Bahn (every 10 min) to the main station and then the ICE train to Freiburg. (www.bahn.de) - see below travel by train! Cheap airlines check www.eurowings.com besides many other airlines.
Airport info: www.flughafen-stuttgart.de

Strasbourg (France) is close but takes 2-4h to Freiburg/Breisgau.
The cheapest and fastest way to reach Freiburg from Strasbourg is flixbus 1,5h. www.flixbus.de
Take a regional train to the main station and then take another regional train to Freiburg im Breisgau. This train connection to Freiburg is not well developed, see www.bahn.de - see below travel by train!
Airport info: www.strasbourg.aeroport.fr

Zürich (CH) is as well an important international airport, 2,5 h by train. The airport has a train connection to Zürich main station (every 10 min). Trains to Freiburg/Breisgau over Basel. There are trains almost every hour, see www.sbb.ch.
Airport info: www.zurich-airport.com

Airport München is about 4,5 h by train! Take first the bus to the main station and then the ICE to Freiburg/Breisgau via Karlsruhe, see www.bahn.de. This is really far, we do not propose this one!
Airport info: www.munich-airport.de

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Travel by remote busses

Now there are cheap remote busses inside Europe and Germany. The cheap tickets need to be booked early.
In Freiburg im Breisgau the bus station is nearby the train station. This is not for all cities in Germany, check first where the busses are leaving from.

Here are some links to the bus lines to search for trips to Freiburg

www.busliniensuche.de
Searching different bus lines inside Europe.

www.flixbus.de
www.busradar.com

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Travel by train:

You get all information and connections on www.bahn.de and can book via Internet. Find the best prices 3 months ahead. Some short term offers are getting available shortly before your traveldate, so check again - check tickets&offers

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Ride shares:

Another cheap possibility to come to the Festival is sharing a ride.

We will create a google spread sheet where participants can add their offer or search for car rides. (The link comes with the participants information)

If you plan to come by car it would be great if you offer this on one of these plattforms.
And also if you are looking for a ride, you can check this sites:

On the sites you will see the price you would have to pay to the driver:
http://www.bessermitfahren.de/
This site is only in german language and rides in Germany, but they are not asking for extra money for the service.

These offer european wide rides and is also in english language:

www.blablacar.de
www.drive2day.com