Orbitz.com
Orbitz.com is probably the best option for bargain hunters.
It offers deals for flights, hotels and rental cars and allows for an individual to put in flexible flight dates in order to get the cheapest fare. In addition, it tells you how many tickets remain available for that flight price so the traveler knows how long he or she can wait before setting their fare price. Having flexible dates makes the process a little more complicated but there are definitely better deals using this method.