Ask ten travellers which is cheaper and you will get ten confident answers, most of them based on a fare someone saw once. The honest answer is that Interrail and budget flights are barely competing on the same route. They compete on trip shape: how far you are going, how long you have, how much you are carrying and how badly you want to be in the middle of a city by lunchtime. Here is how to work out which suits your trip, and how to compare the two without fooling yourself.
What an Interrail pass actually buys you
An Interrail Global Pass gives you a set number of travel days inside a longer window, or continuous travel for a fixed period. There are also One Country Passes if you are staying in, say, Italy or Spain. UK residents buy Interrail; Eurail is the equivalent for people living outside Europe.
The pass covers most trains, not all of them. It does not cover seat reservations, which are compulsory on Eurostar, on most high-speed services in France, Italy and Spain, and on sleeper trains. Those reservations are charged per person, per journey, on top of the pass, and the popular departures sell out weeks ahead in summer.
Travellers under 28 and over 60 usually get a discount, and children under 12 can often travel free with an adult pass. Terms shift from time to time, so check the current conditions before you pay. Two things trip people up: a travel day is not the same as a calendar day, and a pass is not a magic key. Some scenic private railways, city metros and ferries are excluded or discounted rather than free.
What the flight fare leaves out
Budget airlines advertise the seat, not the trip. Add a cabin bag, a checked bag, a seat so you can sit beside your partner, and the transfer from an airport that is nowhere near the city you are visiting, and the total can comfortably double or triple the headline number. Some of those airports sit an hour or more from the centre, and the last bus may leave before your flight lands.
Getting to the UK airport counts too. A 6am departure from a base two hours away may mean a hotel, a taxi or an expensive car park. Trains from a city-centre station rarely demand any of that.
How to compare costs fairly
Run both options through the same five checks before you decide.
- Fix the route and dates. Compare the same journey, not a dream fare on a Tuesday against a Friday train.
- Price it door to door. Include the bus or train to your local airport or station, and the onward transfer at the other end.
- Add luggage on both sides. If you would pay for a checked bag with the airline, note that the train carries it for nothing.
- Add the pass extras. Reservations, sleepers and any seat supplement are real costs. Keep a running total as you book.
- Count a night. An overnight train can replace a hotel, but the sleeper supplement may not be much cheaper than a budget room.
Then divide by the number of people. Passes and advance train tickets are priced per person, so a group of four pays four times over. That is one place where a car, a coach or a shared hire can quietly beat both.
Time, convenience and the airport tax
When people say flying is faster, they mean the flight is faster. The flight is. The day often is not. Two hours at the airport before departure, security, boarding, waiting for a bag, then a transfer into town: a ninety-minute hop can swallow six hours. Trains work differently. You turn up fifteen minutes before departure in the centre of a city and step out in the centre of another.
Long rail journeys have their own cost. A twelve-hour haul with two changes can eat a whole day and leave you tired. As a rough rule, a journey of around six hours city to city tends to be competitive with flying; much beyond ten hours, a plane or a night train usually wins. Night trains save a hotel night and a day, but only if you actually sleep.
Luggage rules, changes and the small print
On the train there is no weight limit and no liquid bag to pack. You carry your own luggage, which is the catch: platforms, stairs, short connections and crowded racks. Italian and Spanish high-speed trains have limited bag space, and dragging a hard-shell suitcase through a busy carriage at speed is nobody's idea of a holiday.
Flights are strict in the other direction. Dimensions are checked at the gate, oversized bags are charged at the worst possible moment, and liquids and sharp objects follow rules that change without warning.
Border paperwork matters on both. UK passport holders should check the Schengen 90-days-in-180 rule and any new EU entry systems being phased in, and travel to non-EU countries on a rail route needs its own checks. Use official government travel advice rather than a blog, and if your trip involves visas, long stays or work, take proper professional advice before booking anything non-refundable.
When Interrail wins, when flying wins
Choose the train if you are
- Visiting three or more places in one trip, so one pass beats three separate tickets
- Keeping plans loose and booking as you go
- Travelling with a medium bag and no interest in checking anything
- Using a night train to move cities while you sleep
- Under 28, where the youth pass changes the maths considerably
Choose the flight if you are
- Going to one city and coming straight back
- Taking a long weekend, where two travel days would ruin the trip
- Flying somewhere rail cannot reach easily, such as across water with no direct link
- Travelling with hand luggage only and a firm date
Decide in five minutes
Write your route down. Price the flight door to door with the bag you would really take. Price the pass plus every reservation you can predict. Compare the total time, not the flight time. Then ask one question: do you want a transport day or a travel day? A flight is usually a means to an end. A train journey through the Alps, along the Rhine or down through Andalusia is part of the trip.
Plenty of people now mix the two, flying out to a far corner of Europe and Interrailing home, or taking the train one way and a cheap return flight back. That is often the most sensible answer of all. Fares and pass prices move constantly, so check live prices close to your dates, and keep a little slack in the budget for the reservations you did not see coming.
Photo: photosforyou / Pixabay
