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Train vs Plane in Europe: When Rail Wins on Time, Cost and CO₂

Valerio Oricchio
11 hours ago
5 min read

Rome to Milan, Paris to Lyon, Madrid to Barcelona: on many European routes you can choose between a short flight and a fast train. The choice is not always obvious. The flight looks quicker on the departures board, the train often looks greener, and the prices can swing either way depending on when you book.

As a transportation engineer who has worked on rail projects, I find this one of the most interesting comparisons in mobility, because the answer depends less on top speed and more on the whole trip, from your front door to your destination. Here is how I think about it, on time, cost and carbon.

Time: think door to door, not gate to gate

The flight time printed on a ticket is only one piece of the journey. To compare fairly, add everything else: getting to the airport, which is usually outside the city; arriving early for security and boarding; taxiing; waiting for bags; and getting from the destination airport into town. Main railway stations, by contrast, are typically in city centres, and boarding a train takes minutes rather than an hour.

That is why rail journey time, not distance, is the variable that matters most. Data compiled for The Geography of Transport Systems across 132 city pairs shows rail's share of the combined air-and-rail market rising sharply once the train journey falls below about five hours, and usually exceeding 70% when the train takes under three hours (Rodrigue, The Geography of Transport Systems). The same source gives a classic example: on Paris–Lyon, rail held about 40% of the market when the trip took four hours, and about 90% once high-speed rail cut it to two.

A European Commission study of eight major air-rail routes, summarized by the consultancy Steer, found evidence of a switching point when the rail journey was under four hours (Steer, By rail or by air?). Research from MIT on European air traffic between 1990 and 2010 reached a related conclusion: as rail travel times fell, short-haul air traffic fell too, with the strongest effect on domestic routes (Clewlow, Sussman and Balakrishnan, MIT).

My practical rule of thumb from this evidence: under about three hours by train, rail almost always wins on door-to-door time. Between three and five hours it depends on where you start and end. Beyond five hours, flying is usually faster, although a night train can turn travel time into sleeping time.

Cost: it depends on how and when you book

Cost is the least predictable part of the comparison. Low-cost airlines compete hard on price, and the same Steer review notes that price competition from low-cost carriers allowed air to keep a larger share on some routes than journey time alone would suggest (Steer). The MIT study goes further: across Europe, low-cost carriers led to a significant increase in total air traffic, while high-speed rail produced only a modest system-wide reduction in air demand (Clewlow et al.).

When comparing fares, I suggest comparing total trip cost rather than the headline price:

  • Add the cost of getting to and from the airport, which can be significant when airports are far from the centre.

  • Add baggage and seat fees, which many low-cost fares exclude.

  • Check whether the rail fare is flexible or tied to one train; flexibility has real value if your plans may change.

  • Book early on both modes; on many European routes, advance rail fares are much cheaper than walk-up fares.

  • Count the value of time you can use. On a train you can usually work or rest for most of the journey, which is harder to do between security queues and boarding gates.

Carbon: where rail has the clearest advantage

On emissions, the picture is much clearer. The European Environment Agency's report Train or plane? concluded that rail is the best and most sensible mode of motorised travel, and that aviation's emissions are much higher per passenger-kilometre, that is, per person for each kilometre travelled (EEA, Transport and environment report 2020). The EEA also adds an important nuance: flying is not necessarily the most harmful choice, because driving a petrol or diesel car alone can be worse.

To put rough numbers on it, Our World in Data, using UK government greenhouse gas conversion factors, estimates about 246 grams of CO₂-equivalent (all greenhouse gases counted as CO₂) per passenger-kilometre for a domestic flight, about 170 for a petrol car and about 35 for national rail. For Eurostar, which runs largely on low-carbon electricity, it cites about 4 grams of CO₂ (Ritchie, Our World in Data). These figures vary with the electricity mix, occupancy and aircraft type, so treat them as orders of magnitude, but the gap between a short flight and an electric train is large.

Policy is pushing in the same direction

Governments are starting to act on this. In 2023 France brought into force a ban on domestic flights where a train can make the trip in under two and a half hours. The final measure is narrow: after European Commission review it applies to three routes, and the rail alternative must offer adequate frequency and capacity (ESG Today). At EU level, the Commission's Sustainable and Smart Mobility Strategy, published in December 2020, aims to double high-speed rail traffic by 2030 and triple it by 2050 (European Clean Hydrogen Partnership, EU policy summary).

From an engineering perspective, the lesson is that speed alone does not win passengers. Frequency, reliability, convenient stations and through-ticketing across borders (one ticket for the whole journey) matter just as much. A high-speed line with three trains a day will not compete with an hourly shuttle flight.

When the plane still makes sense

I want to be fair to aviation. Flying is often the practical choice when:

  • The rail journey is well over five or six hours and there is no convenient night train.

  • The route crosses water or mountains with no direct rail link.

  • Cross-border rail requires several changes with tight or unreliable connections.

  • You are connecting to a long-haul flight and the airport is your real destination.

A quick checklist for your next trip

  • Check the train time first. Under three hours, rail is very likely faster door to door.

  • Estimate total trip time for both options, including access, security and transfers.

  • Compare total cost, not headline fares: airport transfers, baggage and flexibility.

  • Consider what you can do with the time: work, read, rest.

  • If carbon matters to you, choose rail wherever the trip is reasonable; it is usually the largest single cut you can make on a short trip.

  • For longer distances, look at night trains before defaulting to a flight.

The bottom line

Rail does not win every European trip, and it does not need to. On routes up to about three or four hours, the evidence points clearly in its favour on door-to-door time and carbon, and often on comfort too. Beyond that, the decision becomes a genuine trade-off between time, money and emissions, and good information is the best tool for making it.

Which European route have you taken by train instead of flying, and would you do it again? Share your experience in the comments.

Sources and further reading

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