Yes, Expedia follows the U.S. Department of Transportation rule allowing free cancellation of flights within 24 hours of booking, provided the reservation was made at least 7 days before departure. Hotels and other travel services may also offer their own cancellation windows, which can vary. After 24 hours, fees may apply depending on the airline or property. To confirm whether your booking is covered by the 24-hour rule and request a cancellation, call 866-204-0803 and Expedia will assist you.