Ryanair (www.ryanair.com)
Flight time 2h30, from 30 euro: 
Frankfuhrt-Hahn/Bremen/Brussel/Dusseldorf/Eindhoven/
Karlsruhe-Baden/Maastricht/Munich/
Liverpool/London - Porto

Easyjet (www.easyjet.com)
Flight time 2h40, from 35 euro:
Basel-Mulhouse-Freiburg/Genève/London - Porto
Basel-Mulhouse-Freiburg/Berlijn/Bristol/Edinburg/
Genève/Liverpool/London - Lissabon

Germanwings (www.germanwings.com)
Flight time 3h, from 109 euro:
Stuttgart/Koln-Bonn - Lissabon

Tui (www.tuifly.com)
Flight time 3h, from 80 euro:
Hamburg/Koln-Bonnn - Lissabon

Tap-air (www.flytap.com)
Flight time 3h, from 143 euro:
Berlin/Frankfurt/Munchen/Hamburg - Lissabon
Berlin/Frankfurt/Munchen/Frankfurt - Porto

Lufthansa (www.lufthansa.de)
Flight time 3h, from 102 euro:
Berlin/Frankfurt/Munchen/Hamburg/
Kohlen/Stuttgart - Lissabon/Porto

Air Berlin: (www.airberlin.com)

Flight time 5h, from 80 euro: you have to make an stop-over in Mallorca so the fligt last 2 hours more.
Berlin-Tegel/Bremen, Dresden/Düsseldorf/Erfurt/ Frankfurt/Hamburg/Hannover/Köln-Bonn/Leipzig/ München/Münster/Nürnberg/Paderborn/Saarbrücken/ Stuttgart/- Lissabon/Porto