Guests with existing Residence Inn by Marriott San Antonio Six Flags at The RIM reservations for any future arrival date, including reservations with pre-paid rates, can make full changes or cancellations without a charge up to 24 hours prior to arrival, as long as the change or cancellation is made by 30 June 2020. For guests making new reservations at Residence Inn by Marriott San Antonio Six Flags at The RIM for any future arrival date, including reservations with pre-paid rates, between today and 30 June 2020, reservations may be changed or cancelled at no charge up to 24 hours before your scheduled arrival date. For more information, visit the Mariott Response to COVID-19 page. Get latest prices on KAYAK now