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AWS bill tripled in a month, nothing changed deliberately

Almost always data egress. CloudFront, S3 cross-region, NAT Gateway, or a new integration pulling a dataset every night. AWS egress is not flat; it scales per GB.

Try this first

  1. 1Open Cost Explorer and group by Service and Usage Type. "DataTransfer-Out-Bytes" or "NatGateway-Bytes" usually stands out.
  2. 2Walk the VPC flows. A NAT Gateway suddenly pushing volume points at a new service or a retry loop in a Lambda.
  3. 3Check if a third party started a new bulk export (analytics, backup tool, AI training job).
  4. 4Enable Cost Anomaly Detection and set a budget alert. AWS does not warn on invoices by default.

When to bring us in

On a multi-thousand-euro shock in days, open a support ticket. AWS sometimes grants credits for clearly unintended usage, but not automatically and not always.

See also

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