Satellite internet latency
Also known as: Starlink, LEO satellite, GEO satellite, HughesNet, Viasat, OneWeb
Satellite internet beams broadband from space to remote locations without ground infrastructure.
Traditional geostationary satellites orbit at 36,000km, causing 600ms+ round-trip latency that makes real-time applications painful. LEO (Low Earth Orbit) satellites like Starlink orbit at 550km, reducing latency to 20-40ms and making satellite internet practical for most applications.
Satellite internet latency, explained at three levels
At home
Satellite internet uses satellites in space instead of cables in the ground. Traditional satellites are very far away, so signals take a long time to travel up and back: you'd notice a half-second delay in video calls. Starlink satellites are much closer, reducing that delay to something you can barely notice.
At work
Satellite internet is the connectivity option for locations where cable, fibre, or DSL aren't available: rural properties, ships, aircraft, and remote worksites. Starlink has made satellite internet practical for real-time business applications like video conferencing and cloud access.
At home
GEO satellite (36,000 km altitude): latency 600-800ms round trip, unavoidable due to speed of light. Makes real-time gaming and VoIP calls difficult. Speeds up to 100 Mbps but high latency affects web browsing. LEO satellite (550-1,200 km): latency 20-40ms, similar to fixed broadband. Starlink typical speeds: 50-250 Mbps download, 10-30 Mbps upload. Speeds vary based on network congestion and dish alignment.
At work
Starlink business plans add priority data and cost more than residential plans, with speeds of roughly 40 to 500 Mbps. Maritime and aviation Starlink hardware supports moving vehicles. Latency of 20-40ms makes VoIP, video conferencing, and real-time cloud applications practical: a fundamental shift from GEO satellite. Self-installation (dish auto-aligns) removes the need for professional installation in many cases.
At home
LEO satellites move at ~7.5 km/s relative to the Earth's surface, requiring continuous handoffs between satellites as they pass overhead. Starlink uses phased array antennas (the flat 'pizza box' dish) that electronically steer beams without moving parts, enabling fast tracking of passing satellites. Inter-satellite laser links allow traffic to route through the constellation, reducing reliance on ground stations.
At work
Starlink's constellation uses Ku-band (12-18 GHz) and Ka-band (26.5-40 GHz) for service links, with laser links between satellites. Rain fade affects Ka/Ku band availability at high rain rates. Satellite spectrum is internationally coordinated by the ITU; Starlink's rapid constellation deployment has created spectrum coordination disputes with OneWeb and other operators. Starlink's terrestrial interconnection for internet traffic requires ground stations (PoPs) to hand off traffic to the internet backbone.
Real-world examples
At home
Aisha installed Starlink at her family's rural property. After years of 10 Mbps DSL with 500ms latency, she now gets 150 Mbps with 35ms latency. She can finally video call family without audio sync problems.
At work
Marcus's construction company deploys Starlink at remote project sites. Engineers access cloud project management tools, conduct video calls with architects, and download large CAD files: connectivity that was impossible with the previous GEO satellite solution.
How it compares
| feature | GEO satellite | LEO satellite (Starlink) |
|---|---|---|
| Orbit altitude | 36,000 km | ~550 km |
| Round-trip latency | 600-800ms | 20-40ms |
| Typical speed | 25-100 Mbps | 50-500 Mbps |
| Video calls | Difficult | Practical |
| Coverage | Fixed beams, regional | Global (near-polar) |
For analysts
Satellite internet latency directly affects operational feasibility for remote sites: a 600ms latency site can't effectively use cloud-based business software in real time, while a 30ms LEO site can. This matters for site selection, cost-benefit analysis of broadband alternatives, and remote workforce connectivity assessments.
History & origin
HughesNet and ViaSat (now Viasat) have provided geostationary satellite internet since the early 2000s, primarily serving rural areas. The physics of GEO orbit (36,000 km altitude) impose unavoidable 600ms+ latency. Starlink changed the equation: SpaceX launched the first Starlink satellites in 2019 and opened public beta in 2020. By 2025, Starlink had well over 7,000 satellites in orbit and millions of subscribers. Eutelsat OneWeb, Amazon Leo (formerly Project Kuiper), and Canada's Telesat Lightspeed are competing LEO constellations.