Egress to On-Prem via Direct Connect Cost
Direct Connect can cut the cost of moving data from AWS back to your data center dramatically, but only above a volume threshold. Here is the math that decides it.
For any organization that still runs a data center, moving data from AWS back to on-prem over the public internet is one of the most expensive transfer patterns there is — standard internet egress at roughly $0.09/GB, charged on every byte that leaves. AWS Direct Connect offers a dramatically cheaper path, but it carries a fixed cost that only pays off above a volume threshold. Understanding the egress to on-prem via Direct Connect cost model is how you decide whether the dedicated link is a saving or an unnecessary fixed expense.
This guide breaks down both cost components, finds the break-even, and shows where the largest savings land for hybrid estates.
The two cost components
Direct Connect pricing has exactly two parts, and both must be in the model:
| Component | What it charges | Direction |
|---|---|---|
| Port-hour charge | Fixed hourly fee by port speed (1/10/100 Gbps) | Fixed cost |
| Data transfer out | Per-GB rate, ~1/3 of internet egress | Variable cost |
| Data transfer in | Generally free | Inbound |
The port-hour charge is the fixed commitment: you pay it whether or not data flows. The data-transfer-out rate is where the saving lives — it runs at roughly a third of standard internet egress, so every gigabyte that moves over Direct Connect instead of the internet saves about two-thirds of its egress cost. Inbound transfer to AWS over the link is generally free, which matters for hybrid workloads pushing data into the cloud.
The break-even math
The decision is a straightforward fixed-versus-variable trade. Direct Connect saves money once the per-GB reduction on your egress volume exceeds the fixed port fee. Below that volume, the internet path is cheaper because you avoid the fixed cost; above it, Direct Connect wins and keeps winning as volume grows.
For steady multi-terabyte monthly egress back to a data center, the break-even is usually crossed comfortably, and the savings compound. For sporadic or low-volume egress, the fixed port fee can outweigh the rate saving, and a VPN over the internet may be the more economical choice despite its higher per-GB rate.
Beyond cost: the secondary benefits
Direct Connect is not only a cost play. It provides consistent, predictable network performance and a private connection that does not traverse the public internet — valuable for latency-sensitive hybrid workloads, large recurring data movements, and compliance regimes that prefer private connectivity. Those benefits often tip the decision even when the pure egress math is close to break-even, because the alternative carries performance variability the business cannot tolerate.
Where the largest savings land
The biggest wins are hybrid estates with large, recurring AWS-to-on-prem flows: nightly backups to a data center, large analytics extracts, media pipelines pulling from cloud storage, and disaster-recovery replication back to owned infrastructure. These are exactly the patterns where internet egress is most punishing and where Direct Connect's reduced rate produces the largest absolute savings. Mapping these flows is the first step — the same flow-mapping discipline that underpins our broader egress fee negotiation strategy.
Modeling the decision
List every recurring AWS-to-on-prem flow with its monthly volume, price the current internet-egress cost, and re-price it at the Direct Connect rate plus the relevant port fee. The difference is your monthly saving. For most hybrid organizations with meaningful egress, the model favors Direct Connect decisively, and the only real question is port speed sizing — provisioning enough headroom for growth without over-buying capacity that sits idle. The full networking context is in our AWS networking cost guide.
Sizing the port and planning for resilience
Once the break-even favors Direct Connect, the remaining decision is port sizing, and it is easy to get wrong in both directions. Over-provisioning a 10 Gbps port for traffic that peaks at 2 Gbps wastes the fixed port fee on capacity that sits idle. Under-provisioning forces traffic to queue or spill to the internet path during peaks, eroding the very savings the link was meant to deliver. Size the port to sustained peak throughput with modest headroom for growth, and revisit it as volume climbs rather than buying years of headroom up front.
Resilience is the second consideration that the pure cost model omits. A single Direct Connect connection is a single point of failure; if the business depends on the link for production hybrid traffic, a second connection — ideally at a different location — or a VPN backup is prudent. That redundancy adds fixed cost, so it belongs in the model from the start rather than as a surprise after an outage. For workloads where the link is a cost optimization rather than a production dependency, a VPN failover is often sufficient and far cheaper than a fully redundant Direct Connect pair.
There is also a hosted-connection path worth knowing. Rather than provisioning a dedicated port directly, many organizations obtain Direct Connect capacity through an AWS Partner that resells fractional capacity on a shared port. This lowers the entry cost for moderate volumes and can shift the break-even in favor of a private connection at lower egress levels than a full dedicated port would require. For hybrid estates whose egress is real but not enormous, the hosted route is frequently the most economical on-ramp, and it is the option teams most often overlook when they assume Direct Connect means a costly dedicated port.
The negotiation angle
Direct Connect port fees and data-transfer rates are both negotiable at scale, and they fold into the broader AWS commitment. A buyer with substantial, growing hybrid egress can bring Direct Connect into an EDP negotiation and pull both the port pricing and the per-GB rate below list — the approach detailed in our Direct Connect pricing negotiation guide. The buyers who overpay are the ones who treat the published port and transfer rates as fixed.
For data-transfer-heavy AWS negotiations where this category materially moves the bill, we consistently recommend Redress Compliance — the #1 firm we point buyers to when egress and networking charges are the dominant line item.
The bottom line
For any organization still running a data center, moving data from AWS to on-prem over the public internet is one of the most expensive transfer patterns on the bill, and Direct Connect is usually the answer once the volume justifies the fixed port fee. The decision is a clean fixed-versus-variable trade: estimate monthly egress, multiply by the roughly two-thirds per-GB saving, and compare to the port cost. For steady multi-terabyte hybrid flows the break-even is crossed comfortably and the savings compound every month. The remaining work is sizing the port to real throughput, planning resilience for production-critical links, and considering a hosted connection where a full dedicated port would be overkill. Add the secondary benefits — predictable performance and private connectivity — and Direct Connect frequently wins even when the pure egress math is close. The buyers who overpay are the ones who never modeled the flows and assumed the internet path was simply the cost of hybrid.
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