Five great travel booking sites

The following five sites have proven the most consistently useful for the editors of Budget Travel, who do thousands of searches a year. Strictly for booking plane trips entirely outside of the U.S., such as a flight between Paris and Rome. The site runs simultaneous searches of multiple airports serving the same city — five airports in London, for instance — and it retrieves fares from no-frills independent carriers like EasyJet and Ryanair, which many better-known travel sites overlook.