questionswhat's the best site to buy international airline…

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The carrier itself often has the best fares. Also of course there are the various sites such as Kayak, Mobissimo, Best Fares, Orbitz, Expedia, Travelocity, airfare watchdog, trip advisor and on and on and on.

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You can also often get a break on airline prices by buying package deals. On something as costly as airfare, I do full research every time rather than relying on a single site to get me the best price.