You can use Amtrak.com to cancel your reservation if you made your reservation online. If you have made modifications to your trip after booking it online, you may not be able to cancel it online. If you paid for your one-way, round-trip or multi-ride reservations with a credit card or an eVoucher, you can also cancel it on Amtrak.com, even if you made your reservations on the phone, at a Amtrak kiosk or with a station agent. Refunds for canceled reservations will be applied to the original form of payment or an eVoucher. Cancellation fees may apply and not all tickets are eligible for cancellation.

If you have a profile on Amtrak.com, log in to see your upcoming reservations and select the reservation you want to cancel. 

If you haven't created a profile, just click the 'Modify Trip' button in the site header. Then enter your reservation number and either your email address or your phone number and click 'Find Trip'.