Bing Travel: http://www.bing.com/travel/ http://www.bing.com/travel/ (aka FareCast) is my personal favorite. Their price predictor for certain routes is quite

Bing Travel: http://www.bing.com/travel/ http://www.bing.com/travel/ (aka FareCast) is my personal favorite. Their price predictor for certain routes is quite accurate.