Why it's similar
Both let you search and arrange flights, hotels, and cars in one place for a full trip. The plan-the-whole-trip scope matches KAYAK.
How it differs
Expedia is an online travel agency where you book and manage everything directly, with rewards and bundled packages, rather than a metasearch handoff. Its enormous 5.7-million-rating base means direct booking support that KAYAK's metasearch model does not provide.
