A few years ago, the Irish airline Ryanair put a former U.S. air base to use as an established base in the heart of Europe. Now, it's one of the busiest airports on the continent. The downside is its distance from Frankfurt, 120 km, or 90 minutes by bus. I recommend the Bohr company bus at the terminal exit. We booked online tickets at Terravisión, another bus company, and waited half an hour to leave, and the informality of the driver cost us another half hour at night in bad, cold weather, since the airport doesn't have a bus station shelter. So take warning.
The Irish airlines Ryanair began to reuse a former U.S. air base a few years ago to establish bases in this place in the heart of Europe. Now it is one of the busiest airports in the continent, the downside is its distance from Frankfurt, 120 kilometers, or 90 minutes by bus. My recommendation is that you get the Bohr company bus at the door of the terminal, we had the idea to book online tickets at Terravisión, another bus company, we waited half an hour for the next bus, and because of the informality of the driver, another half hour at night and at 1 below zero, since the airport bus station has no where to take shelter. So, be sure to learn from our mistake.
Schonefeld is the former East Berlin airport, and is located about 20km from the city center. This airport hosts many lowcost airlines such as Easyjet, Ryanair and Germanwings. To arrive there, hop on the S-bahn line 9 that is direct from Alexanderplatz to the airport. When we had to work, we took a free shuttle bus to another stop of the S-Bahn 9. The airport is located in Area C of travel, so you have to buy a special ticket, a single ticket costing 2.80 euros. If you want a ticket that includes travel within Berlin for the day, the price is 5.60 euros. The inside of the airport is pretty basic, at least security is quick, and there are some shops. The food stalls aren't cheap and they have terraces. The tourist information office can sell the card for transportation and museums or daily pass only for transports.
Hamburg Airport is one of the largest in Germany, after Frankfurt and Munich. It has two terminals which are quite close to each other and is very well connected to the city center by metro line 1 (s-bahn) that leaves the main station (Hauptbahnhof). Something that is confusing is that only the first three subway cars arrive at the airport, since the train is splits in two and the last section goes in another direction, so be careful. Another warning is that the code for this airport is HAM (for Hamburg), and although Ryanair announces flights to Hamburg it will really be Lübeck (LBC), which is 60 kilometers northeast of Hamburg.
Schönefeld is the former airport of East Berlin. It is connected to the city center by trains S9, S45, the Airport Express and the bus 171 or X7, leading to the underground station Rudow U7. Although relatively small, Schönefeld has direct flights to major European capitals with EasyJet and Ryanair, as well as domestic flights with German Wings. From Spain there are direct flights to Madrid, Barcelona, Malaga, Palma de Mallorca and Ibiza. On the first floor of Terminal A is the Mövenpick restaurant with great breakfasts and views of the runways. They are building a new runway for 2011.