Experience show that ID tickets are of small value if all flights are full. Long haul flights stand-by and with familiy, friends and/or children are a nightmare.
Try ticket discounter like expedia.co.uk/com/de, opodo, loneyplanet and the like. Expedia has imho the biggest choice and they combine different airlines for the same trip, you get really all kind of city pairs.
Good hunting!
Dani