If you’re evaluating your network infrastructure, you’ve probably encountered the SD-WAN vs MPLS debate. Both technologies connect branch offices and remote sites to your corporate network, but they take fundamentally different approaches — and the right choice depends on your business priorities, budget, and growth plans.

This guide breaks down the practical differences so you can make an informed decision.

What Is MPLS?

Multiprotocol Label Switching (MPLS) is a private networking technology that has been the backbone of enterprise WANs for over two decades. Instead of routing packets hop-by-hop using IP addresses, MPLS assigns labels to packets and forwards them along predetermined paths through your carrier’s network.

How it works in practice: Your carrier provisions dedicated circuits between your locations. Traffic travels across the carrier’s private backbone, isolated from the public internet. You get guaranteed bandwidth, low latency, and predictable performance — but you pay a premium for it.

MPLS has been the gold standard for businesses that need reliable connectivity between offices, data centers, and cloud environments. Banks, hospitals, and manufacturers have relied on it for decades.

What Is SD-WAN?

Software-Defined Wide Area Networking (SD-WAN) is a newer approach that creates a virtual network overlay on top of any available transport — broadband internet, LTE/5G, MPLS, or a combination. A centralized controller makes real-time routing decisions based on application requirements and link conditions.

How it works in practice: You install SD-WAN appliances (physical or virtual) at each location. These devices connect to whatever internet or WAN links are available and intelligently route traffic based on application policies. Video calls might use the lowest-latency path while email takes the cheapest route.

SD-WAN doesn’t replace your underlying connections — it makes them smarter.

Cost Comparison

Cost is usually the primary driver behind the SD-WAN conversation. Here’s how the economics typically break down.

MPLS Costs

MPLS pricing varies by region and carrier, but typical ranges for a single site include:

Circuit costs: $500–$3,000/month per site for 10–100 Mbps
Installation: $1,000–$5,000 per site
Provisioning time: 30–90 days for new circuits
Bandwidth upgrades: Require new circuit orders, often with contract amendments

The per-megabit cost of MPLS is significantly higher than broadband internet. A 100 Mbps MPLS circuit might cost $2,000/month, while a 500 Mbps broadband connection runs $100–$200/month.

SD-WAN Costs

SD-WAN shifts spending from carrier circuits to software and commodity internet:

Software licensing: $100–$500/month per site (varies by vendor and features)
Hardware/appliances: $500–$3,000 per site (one-time) or included in subscription
Underlying transport: $100–$400/month per site for dual broadband connections
Provisioning time: Days to weeks, not months

Typical savings: Organizations that migrate from MPLS to SD-WAN over broadband report 40–70% reductions in WAN spending. A 20-site network spending $40,000/month on MPLS might spend $12,000–$18,000/month with SD-WAN.

The Hidden Cost Factor

MPLS contracts typically run 2–3 years with early termination fees. Factor remaining contract obligations into your migration timeline. Many businesses run a hybrid approach during the transition — keeping MPLS at critical sites while moving less-sensitive locations to SD-WAN first.

Performance Comparison

Latency and Jitter

MPLS wins on paper. Because traffic travels a dedicated path through the carrier’s backbone, MPLS delivers consistent latency (typically 20–40ms between domestic sites) with minimal jitter. This predictability is why real-time applications like voice and video have traditionally required MPLS.

SD-WAN closes the gap. Modern SD-WAN compensates for internet variability using techniques like forward error correction, packet duplication, and dynamic path selection. If one internet link experiences congestion, SD-WAN reroutes traffic to a better path in milliseconds. With dual broadband links, SD-WAN delivers voice quality that matches MPLS in most scenarios.

Bandwidth

This is where SD-WAN has a clear advantage. Internet bandwidth is dramatically cheaper than MPLS bandwidth. Where you might have 50 Mbps of MPLS, you could afford 500 Mbps or more of broadband for the same price. For bandwidth-hungry applications like cloud backup, video conferencing, and SaaS tools, more bandwidth often matters more than slightly lower latency.

Cloud Application Performance

MPLS was designed for hub-and-spoke networks where traffic flows to a central data center. When your applications move to the cloud, MPLS creates an inefficient “trombone” effect — traffic from a branch travels to headquarters, then out to the cloud, then back the same way.

SD-WAN supports direct internet breakout at each site, sending cloud-bound traffic straight to the nearest cloud on-ramp. Microsoft 365, Salesforce, and other SaaS apps perform noticeably better with local internet breakout than with backhauled MPLS.

Security Comparison

MPLS Security

MPLS is often described as “inherently secure” because traffic travels a private carrier backbone rather than the public internet. This is partially true — your traffic is isolated from other customers’ traffic — but MPLS does not encrypt data. Anyone with access to the carrier’s infrastructure could theoretically intercept it.

MPLS provides isolation, not encryption. Many compliance frameworks still require additional encryption even over MPLS.

SD-WAN Security

SD-WAN transmits traffic over the public internet, so encryption is essential — and built in. All major SD-WAN platforms include IPsec or TLS encryption for all traffic between sites. Many also include integrated firewalls, intrusion prevention, URL filtering, and cloud security (SASE) capabilities.

The security model is actually more comprehensive than MPLS because SD-WAN forces you to address encryption explicitly rather than relying on transport-layer isolation.

Flexibility and Scalability

Adding New Sites

MPLS: Provisioning a new MPLS circuit takes 30–90 days depending on location and carrier. International sites can take longer. Each new site requires coordination with your carrier.

SD-WAN: Ship an appliance to the new location, plug it into any available internet connection, and the device auto-configures through the central controller. New sites can be online in days.

Supporting Remote Workers

MPLS: Not designed for remote workers. You need separate VPN infrastructure to connect home offices and mobile users.

SD-WAN: Most platforms include built-in remote access capabilities, extending the same policies and security to home workers and mobile devices.

Multi-Cloud Connectivity

MPLS: Connecting to multiple cloud providers requires dedicated interconnects (like AWS Direct Connect or Azure ExpressRoute) at each cloud on-ramp, adding cost and complexity.

SD-WAN: Connects to any cloud provider through the internet, with application-aware routing that optimizes performance for each cloud destination.

When MPLS Still Makes Sense

Despite SD-WAN’s advantages, MPLS remains the right choice in some scenarios:

Ultra-low-latency requirements: High-frequency trading, real-time industrial control systems, or other applications where every millisecond matters
Locations with poor internet options: Rural or international sites where broadband is unreliable or unavailable
Regulatory requirements: Some industries or government contracts mandate private circuits
Existing long-term contracts: If you’re locked into MPLS contracts, a hybrid approach may make more sense than paying termination fees

When to Choose SD-WAN

SD-WAN is typically the better choice when:

Cloud adoption is growing: You’re moving applications to SaaS, IaaS, or hybrid cloud
Bandwidth needs are increasing: Video, collaboration tools, and cloud backups demand more capacity
You’re opening new locations: Faster provisioning and lower per-site costs accelerate expansion
Remote work is part of your strategy: Built-in remote access eliminates separate VPN infrastructure
Cost reduction is a priority: 40–70% WAN savings can be redirected to other initiatives

The Hybrid Approach

Many businesses don’t make an all-or-nothing switch. A common migration path:

Deploy SD-WAN alongside existing MPLS at headquarters and critical sites
Migrate less-critical branch offices to SD-WAN over broadband first
Monitor performance and validate that SD-WAN meets your quality requirements
Phase out MPLS circuits as contracts expire, keeping them only where truly needed

This approach minimizes risk while capturing cost savings at the majority of your sites.

How PCG Can Help

Choosing between SD-WAN and MPLS isn’t just a technology decision — it’s a business decision that affects your budget, agility, and growth plans. As a vendor-neutral consultancy, we evaluate solutions from multiple SD-WAN and MPLS providers to find the right fit for your specific environment.

We help with:

Network assessments to baseline your current performance and costs
Solution design that matches your application requirements and budget
Vendor evaluation across leading SD-WAN platforms
Migration planning that minimizes disruption
Ongoing optimization as your network needs evolve

Whether you’re ready to migrate or just starting to explore, we can help you make the right call.

SD-WAN vs MPLS: Which Is Right for Your Business?