Seven ranked strategies to cut AWS NAT Gateway costs, from free fixes to VM swaps

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AWS NAT Gateway charges accrue both hourly and per GB of data processed, making costs easy to overlook as cloud infrastructure scales. The most impactful and cost-free first step is enabling gateway endpoints for S3 and DynamoDB, which can eliminate 30–60% of per-GB charges with only a route-table change. Interface endpoints via AWS PrivateLink can further reduce costs for high-traffic services, while enabling VPC Flow Logs helps identify and address the heaviest traffic sources. Additional savings come from routing traffic zonally to avoid cross-AZ surcharges, consolidating non-production gateways, or replacing managed gateways with self-operated NAT instances that carry no per-GB fee. For organizations running their own egress filtering, flat-priced network virtual appliances offer a predictable alternative, though the right choice depends on traffic volume and operational capacity.

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