If you reside in Germany, then the cheapest days to fly are Tuesdays (going) and Wednesday (returning). If you can do your booking 34 days in advance, this will save you some additional money.
In addition to watching your booking date and departure/arrival dates, we have found that the internet online travel agency Opodo is more straightforward than billigfluege.de .When we booked our son’s return trip from the UK with Opodo for euro 130,52, all that showed as an extra charge – just before you push “book now”- was the credit card surcharge of euro 4,09.
When it came time to book another flight for the same route Frankfurt – Birmingham, my travel companion forwarded another internet online travel agency link, because of an even lower price, and this time it was with billigfluege.de.
The same flight was advertised for euro 114, but just before you click “book now”, the VAT of 19% and a credit card fee of euro 8 p.p. are added on the very last page.
Having entered all our information, we proceeded and in the end, we even paid euro 10 more per person. The slightly higher price is no problem, I just don’t like the way billigfluege.de got us on this one.
We will stick with Opodo from now on.