...The Web is an essential tool for travelers, but as booking engines and trip forums evolve and multiply, you have to know where to look -- and whom to trust. To help you, Travel + Leisure has assembled the ultimate online guide....

Sidestep.com

Comparing top aggregators Sidestep and Kayak, we found that eight-year-old Sidestep's flight tool has a slight edge: A handy matrix at the top of the results page gives an overview of the lowest prices pulled from 600 airlines across 200 sites. And refining the search by departure time or airport is a breeze....

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