Expedia provides a 24-hour risk-free cancellation policy, allowing travelers to cancel or modify flights within 24 hours of booking without penalties. After this period, cancellation terms depend on the airline's policies, which may include fees or non-refundable fares. Carefully review ticket details during booking to understand restrictions. Some tickets offer flexible options, while others do not. For clear guidance, refer to your itinerary or contact Expedia customer support to navigate changes smoothly and minimize costs.