Train from London St Pancras International to Sion
🇬🇧 London St Pancras International → 🇨🇭 Sion
Straight-line Distance
804 km
SE (134.3°)
Rail Distance
~1,045 km
Estimated by rail
Travel Time
~3h 54m
High_Speed
CO2 Saved vs Flight
91.3%
186.4 kg less CO2
Environmental Comparison
Train
High_Speed
CO2 Emissions
17.8 kg
Flight
Economy class
CO2 Emissions
204.2 kg
Taking the train saves 186.4 kg CO2 (91.3% less emissions)
Route Information
Requires Transfer
Time zone difference: 1.0 hour(s)
Stations on This Route
Continue Your Journey
Continue from Sion
Also from London St Pancras International
Frequently Asked Questions
The estimated train journey from London St Pancras International to Sion takes approximately 3h 54m. This estimate is based on a rail distance of ~1045 km using a high_speed service.
The estimated rail distance from London St Pancras International to Sion is approximately 1045 km (804 km straight-line). Rail routes are longer than straight-line distances because tracks follow terrain and connect intermediate cities.
Travelling by train from London St Pancras International to Sion emits approximately 17.8 kg of CO2, compared to 204.2 kg by flight. Taking the train saves 186.4 kg of CO2 — a 91.3% reduction in emissions.
The route from London St Pancras International to Sion typically requires at least one transfer. Check operator timetables for the most direct connection available.
Check regional and national rail operator websites for services between London St Pancras International and Sion.
Train vs Flight comparison
Compare door-to-door time, CO2 and cost for London St Pancras International to Sion
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Data last updated: 2026-02-27