Cloud Data Transfer and Egress Costs Cheat Sheet

Updated 2026-05-25

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Cloud data transfer costs represent 10–18% of total cloud spending and are among the most overlooked yet impactful drivers of cloud bills. Ingress (data moving into cloud infrastructure) is universally free across all major providers, while egress (data leaving cloud infrastructure) incurs charges that vary significantly by destination, volume, and provider. Understanding the nuanced pricing models—from inter-AZ charges ( $0.01/GB) to internet egress fees ($ 0.085–$0.12/GB) to cross-region transfers—is essential for cost-effective cloud architecture. The competitive landscape shifted meaningfully in 2024–2026 as AWS, GCP, and Azure all introduced free-egress exit programs under EU Data Act pressure, and zero-egress storage providers like Cloudflare R2, Wasabi, Tigris, and Backblaze B2 emerged as serious alternatives at scale. The key insight: architectural decisions made early determine whether data transfer becomes a minor line item or a budget-crushing 15% tax on every workload.

What This Cheat Sheet Covers

This topic spans 16 focused tables and 155 indexed concepts. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.

Table 1: Ingress vs Egress FundamentalsTable 2: Internet Egress Pricing Tiers (2026)Table 3: Inter-Region Data Transfer CostsTable 4: Inter-Availability Zone Transfer ChargesTable 5: NAT Gateway and Internet Gateway FeesTable 6: CDN and Edge AccelerationTable 7: Zero and Low Egress Storage AlternativesTable 8: Private Connectivity and VPC EndpointsTable 9: Dedicated Network ConnectionsTable 10: Service-Specific Data Transfer CostsTable 11: Data Transfer Free Tiers and AllowancesTable 12: Egress Cost Optimization StrategiesTable 13: Multi-Cloud, Hybrid, and Cloud Exit ScenariosTable 14: Volume Discounts and Committed Use ProgramsTable 15: Monitoring, Alerting, and Cost Attribution ToolsTable 16: Egress Pricing by Geographic Region

Table 1: Ingress vs Egress Fundamentals

The asymmetry between free ingress and charged egress is the defining pricing principle of cloud networking. Internalizing these six categories before designing any architecture prevents the most common and costly billing surprises.

Concept	Example	Description
Ingress (Data In)	Upload 10 TB to S3: $0	• Data flowing into cloud infrastructure — universally free across AWS, Azure, GCP, OCI, and all major providers • no charges for uploads, writes, or inbound transfers
Egress (Data Out)	Download 10 TB from S3: $900	Data flowing out of cloud infrastructure to the internet, other regions, or external destinations — charged at $0.085-$ 0.12/GB after the free tier on AWS/Azure/GCP.
Internet Egress	EC2 → public internet: $0.09/GB	• Data transferred from cloud to the public internet — the most expensive egress category • first 100 GB/month free on AWS, Azure, and GCP
Intra-Region Transfer	Same-region S3 → EC2: Free	Data transfer within the same region between services is free when using private IPs or gateway endpoints — the single most powerful cost lever.

Table 1: Ingress vs Egress Fundamentals

Concept	Example	Description
Ingress (Data In)	Upload 10 TB to S3: $0	• Data flowing into cloud infrastructure — universally free across AWS, Azure, GCP, OCI, and all major providers • no charges for uploads, writes, or inbound transfers
Egress (Data Out)	Download 10 TB from S3: $900	Data flowing out of cloud infrastructure to the internet, other regions, or external destinations — charged at $0.085-$ 0.12/GB after the free tier on AWS/Azure/GCP.
Internet Egress	EC2 → public internet: $0.09/GB	• Data transferred from cloud to the public internet — the most expensive egress category • first 100 GB/month free on AWS, Azure, and GCP
Intra-Region Transfer	Same-region S3 → EC2: Free	Data transfer within the same region between services is free when using private IPs or gateway endpoints — the single most powerful cost lever.