Tickets must be canceled 24 hours prior to the departure of the flight to keep their value. There is no refund for no-shows. The ticket is lost, and no residual value is preserved.
If you are at the airport, please see a customer service agent for your options.
Note: If it has been more than 24 hours since you purchased your ticket, or the booking was made within 7 days (168 hours) of travel, a cancellation fee may apply and can be found here. The value of your ticket, less non-refundable charges or fees, may be applied toward the purchase of a future ticket. To cancel your booking, log into My Trips.