ISTSS has secured a discounted rate of $279 USD for single or double occupancy. The current government per diem rate of $137 (government ID required) is also available and can be booked.

Room availability and rates are subject to availability and will incur applicable state and local taxes/fees. Please note that the deadline to secure the discounted ISTSS rate is August 30, 2026. Reservations made after this date cannot be guaranteed at the reduced rate.

A credit card guarantee is required to hold your reservation. The hotel will refund your deposit if cancellation is received at least 3 business days prior to your arrival (in local time) and a cancellation number is obtained.

Hotel check-in is at 4:00 p.m. local time, and check-out is at 11:00 a.m. local time.

For more general information about the San Antonio Marriott Rivercenter, please visit San Antonio Marriott Rivercenter on the River Walk.