Call Expedia at 1-877-787-3125, 24 hours a day, 7 days a week. Have your reservation information and confirmation number available.
Decide whether you want to pay the cancellation fees or pay to rebook the flight. The customer service representative will communicate to you what fees will be assessed, based on the airline's policies. Expedia does not charge its own cancellation fees, but has to charge for those expected by the airlines. You must decide if the cancellation fees are an acceptable loss. Sometimes changing the flight is a better option.
Inform the customer service representative of your decision. If canceling or changing your flight, the representative will provide a cancellation or confirmation number. Your flight cost, less any applicable fees, will be refunded to your credit or debit card if the ticket is refundable; if the ticket is non-refundable, you will receive a credit with the airline to rebook your flight within 12 months.