If you bought your ticket through Reservations or on usairways.com you can:
If you bought your ticket from a travel agent or online with Expedia, Travelocity or other website, please contact the agent or site for a refund.
Have questions about refunds?
Refunds contact information
If you bought a paper ticket through US Airways, either use our postal address to mail in your refund or return the ticket to any US Airways airport or ticketing location.
4000 East Sky Harbor Blvd.
Phoenix, AZ 85034
Attention: Passenger refunds