The pitch was managed by the AAR following Clemmow Hornby Inge's decision to resign the account after clashes with Expedia's marketing director, Elysa Chowdhury.
Expedia, which launched in 1998, has one of the highest media spends in the travel sector. It enables consumers to create their own holidays by purchasing each segment separately and competes with traditional tour operators and online brands such as ebookers and Travelocity.
Tom Vick, the joint managing director at DFGW, said: "We're absolutely delighted to be working with such an ambitious and dynamic brand at a critical time in its development."
Expedia's media buying is by PHD.
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