Don’t assume that Travelocity, Orbitz, Expedia, and Sidestep all have the same fares.

They don’t. Especially on international fares, one of these online travel agencies could have a fare several hundreds less or higher than another. A few years ago, Travelocity was selling seats to London on Virgin for $400-$470 round-trip, taxes included, from east and west coast cities, even for peak summer travel. Those fares were only available on Travelocity,  (they weren’t even available on Virgin’s own site). So check all the online agencies, and use multi-site search engines such as Booking Buddy.

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