Both Unister (Flueche.de, Airlinedirect.de etc) and Odigeo Group (edreams/opodo) do offer some really cheap flights and awesome discounts.


But if you actually need help Expedia.de offers the best service. Their agents are well trained and know their job. Expedia doesn't offer any real discounts but they don't cheat (no aggressive sales of useless insurances, no hidden fees) which makes them great to book certain fares which are not bookable through the airline as well as Error Fares.