Germanwings:
http://www.germanwings.com/de/index.shtml
Ryanair:
http://www.bravofly.de/content/ted/billigfluge-angebote/fluge-ryanair.html?COBRANDED=GMADWORDDE&sembox_content=[Ryanair]&gclid=CIaH8pXav7UCFYKN3god-z0Arw
TUI-FLY:
http://www.tuifly.com/de/index.html
Air-Berlin:
http://www.airberlin.com/de-DE/site/start.php