Amazon S3 (Standard) SLA
AWS · Storage · promises up to 99.9% · SLA of Nov 28, 2023 · checked 25h ago
3 major outages in the last 365 days, each in one region (me-south-1, me-central-1 and us-east-1).
Worst region me-central-1: 72 h counted, 99.178% observed against the 99.9% S3 Standard (also Express One Zone, Glacier Flexible Retrieval, Glacier Deep Archive), which applies per region. 2 of 12 months fell below it (credits are claimed per month). 2 incidents ran past 72 hours; each counts for 72 hours at most (see the method).
Last 90 days: no major outage.
Incidents, last 365 days
Major outage time per month
Allowed per month: 44 min
Commitments and credits
- S3 Standard (also Express One Zone, Glacier Flexible Retrieval, Glacier Deep Archive)Requests to S3 Standard and other classes not listed separately99.9%below 99.9%: 10% · below 99%: 25% · below 95%: 100%
- S3 Intelligent-Tiering, Standard-IA, One Zone-IA, Glacier Instant RetrievalRequests to the infrequent-access storage classes99%below 99%: 10% · below 98%: 25% · below 95%: 100%
SLA changes
- Mar 20, 2019Amazon S3 (Standard)S3 Standard credit schedule gained a 100% tier below 95.0% (and a 25% band 95.0-99.0%). April 4, 2018 version: 99.0-99.9% = 10%, less than 99.0% = 25%. March 20, 2019 version: 10% / 25% / 100%. Standard-IA got the same 100% tier below 95%. The 99.9% threshold did not change.Source
More in storage
Cloudflare R2Cloudflare · Storage · Enterprise99.9%First credit10%Observed 365d100%All incidents 99.984%
Spaces Object StorageDigitalOcean · Storage · All accounts99.9%First credit10%Observed 365d100%All incidents 99.992%
Cloud StorageGoogle Cloud · Storage · Standard, multi-region or dual-region99.95%First credit10%Observed 365d99.927%All incidents 99.488%
Azure Blob Storage (Storage Accounts)Microsoft Azure · Storage · Hot / Transaction Optimized, RA-GRS and RA-GZRS read requests99.99%First credit10%Observed 365dNo feedAll incidents 100%
OCI Object StorageOracle Cloud Infrastructure · Storage · Availability99.9%First credit10%Observed 365dNo feed
Terms, exclusions and sources
- Measured
- Monthly Uptime Percentage = 100% minus the average of 5-minute Error Rates (InternalError / ServiceUnavailable) in the billing cycle, per storage class per region
- Credit cap
- Up to 100% of charges for the affected storage class in the region at the lowest tier; applied against future S3 payments; issued only if over $1
- Claim window
- By the end of the second billing cycle after which the incident occurred
- How to claim
- Open a case in the AWS Support Center with 'SLA Credit Request' in the subject line and request logs
- Not covered
- Factors outside AWS's reasonable control (force majeure, Internet problems beyond the S3 demarcation point); Customer actions or inactions; Customer equipment, software or other technology; AWS suspension or termination of the right to use S3
- Status history
- Status history since Sep 23, 2025
- Weighted uptime
- All incidents, weighted: 99.852% · Downtime
For requests to S3 Standard, S3 Express One Zone, S3 Glacier Flexible Retrieval, S3 Glacier Deep Archive, and all other requests not specified below: ... Less than 99.9% but greater than or equal to 99.0% 10%
The page states the commitment only through the credit table (no standalone 'at least X%' sentence); the uptime value is the top threshold of the credit table. Credits for S3 Express One Zone are per Availability Zone.
Sources: each vendor's own SLA page (re-read monthly) and status page feed (read every Friday). A summary, not the contract: the contract you sign governs. Logos via logo.dev; trademarks belong to their owners.