Money Magazine recently had a good article on “booking sites” and brought to my attention, the site Vayama.com If you are planning an overseas trip, you should check it out. We are looking for an eastern Africa safari type trip (assuming Ebola does not move into that area) so I used the site and was quite pleased. I went on to try out different traveling scenarios in Europe and southeast Asia. 
Vayama will give you multiple options of airlines and give the lowest price for each. You can filter it by number of stops and price it in the currency of your choice. You then pick the airline and deal of your choice and drill down further. In addition, Vayama gives direct links from other discount booking sites and allows you to transfer your proposed itinerary directly there.
For example, I searched for a flight from Barcelona, Spain to Ho Chi Minh City, Vietnam and was given 18 airlines with their lowest price. The lowest was Emirates Airline at $833 roundtrip. I was then given the option to go directly to Priceline and three others. Priceline beat the $833 price by one dollar on the same airline. Funny how that happens.
Vayama is a fun site to play around with. It has a category called deals where you pick your city or region and a choice of trips are displayed. They go on to describe some of the highlights of the region.
