Do check the list of sites they search: http://www.momondo.com/we-search/ http://www.momondo.com/we-search/ I don't remember how I stumbled upon these guys, bu

Do check the list of sites they search: http://www.momondo.com/we-search/ http://www.momondo.com/we-search/ I don't remember how I stumbled upon these guys, but generally their flight results are the cheapest. They don't do too well in hotels (I tried US ones) though.