Compare Medium Haul

Train vs Flight: London St Pancras International to Sion

🇬🇧 London St Pancras International → 🇨🇭 Sion · 804 km

Verdict

Flight is faster by 3h 45m door-to-door, but train produces 84% less CO2 — worth considering.

On this medium-haul route from London St Pancras International to Sion, the flight is faster door-to-door, but the train is a greener alternative — saving 172 kg of CO2 per passenger. If your schedule allows extra travel time, the train offers a comfortable, eco-friendly journey.

Comparison

	Train	Flight ✓
Journey time	6h 42m	57m
Door-to-door incl. check-in / airport	7h 12m +30 min at station	3h 27m +2h 30min at airport
CO2 emissions avg. estimate per passenger	33,0 kg	205,0 kg
Est. ticket price rough estimate only	~€64	~€96
City centre arrival	Central station	Airport (outside city)

* Price and CO2 figures are rough average estimates. Actual values vary by booking class, date, operator, and energy mix. Journey times are based on existing route data or standard speed assumptions.

CO2 Savings

Save 172,0 kg CO2 — 84% less than flying

Train: 33,0 kg CO2 · Flight: 205,0 kg CO2 (41g/km train vs 255g/km flight, European averages incl. radiative forcing)

Train

33,0 kg

Flight

205,0 kg

Door-to-Door Breakdown

Train

Check-in at station 30 min

Journey time 6h 42m

Total door-to-door 7h 12m

Flight

Faster door-to-door

Airport overhead 2h 30 min

Flight time 57m

Total door-to-door 3h 27m

Train tickets for this route

London St Pancras International → Sion · full route details

View route details →

Frequently Asked Questions

Is train or flight faster from London St Pancras International to Sion?

Flight is faster from London St Pancras International to Sion, taking 3h 27m door-to-door versus 7h 12m for the train. However, the train produces 84% less CO2.

How much CO2 does the London St Pancras International–Sion train vs flight produce?

For the London St Pancras International to Sion route (804 km straight-line), the train produces approximately 33,0 kg of CO2 per passenger, while the flight produces approximately 205,0 kg. Taking the train saves 172,0 kg of CO2 — a 84% reduction. These are average estimates based on European averages (train: 41g CO2/km, flight: 255g CO2/km including radiative forcing).

What is the door-to-door travel time for train vs flight London St Pancras International to Sion?

Door-to-door travel time from London St Pancras International to Sion:

Train: 7h 12m total (6h 42m journey + 30 min station check-in)
Flight: 3h 27m total (57m flight + 2h 30min airport overhead for check-in, security, boarding, and taxi)

Is the London St Pancras International to Sion train worth it vs flying?

How far is London St Pancras International from Sion?

The straight-line distance from London St Pancras International to Sion is 804 km. The actual rail distance will be longer (typically ~1.3× the straight-line distance) due to track routing.