Short of the old school
"delivery" sites which I'm not sure even exist any more, I'd be impressed if you could save much more than pence over Expedia. Doesn't everything use the same search data anyway?
( the mighty badger Aphrodite, on a bar stool, by your side, Tue 1 Mar 2011, 10:09, 1 reply, 15 years ago)

Different comparison sites search different sites slightly differently
So whilst there is a huge amount of overlap, you do need to try more than one.

See here for car insurance example: www.moneysavingexpert.com/insurance/compare-cheap-car-insurance#step2
( Naked Ape call me Caitlyn, Tue 1 Mar 2011, 10:11, Reply)

I'm sure that's true of insurance, aye
I'd just be surprised it it made the slightest difference to flights as there are no real variables in flight costs, doesn't everything just feed directly back to the airline's cost these days?
( the mighty badger Aphrodite, on a bar stool, by your side, Tue 1 Mar 2011, 10:14, Reply)