Yes, Expedia has a 24-hour <1~(844)~524~31.35)>flight cancellation policy that applies to all tickets booked directly through their website or mobile app. This policy states that if you cancel your flight within 24 hours of booking and the flight is at least seven days away, you can receive a full refund.
Does Expedia have a cancellation policy?
Is Expedia fare refundable?
Does Expedia 24-hour cancellation apply to Basic Economy?
How can I tell if my Expedia flight is fully refundable?