Train station platform at dusk with departure board
By Rail

Booking trains online

Trainline, Omio and the operator apps compared.

By the Viamo editorial team · Editor Terje Moy · Last updated July 2026 · 5 min read

Booking a train ticket across Europe can mean navigating a patchwork of national websites, third-party aggregators and apps — some covering the same routes, some covering different ones. Understanding which platform to use for which journey saves money, avoids missed connections and makes the whole process much less confusing.

The core options: direct booking vs third-party platforms

When you book a European train ticket, you essentially have two routes:

Neither approach is universally best. The right choice depends on the route, the operators involved and how much you value convenience over the lowest possible price.

Booking direct: when it makes sense

For a single-country journey — Paris to Lyon on TGV, Munich to Berlin on ICE, Florence to Rome on Frecciarossa — the national operator's website is usually the best starting point:

The downside of booking direct is that most national websites handle only their own routes well. A journey from London to Barcelona involves Eurostar (London to Paris), then SNCF TGV (Paris to Barcelona) — two separate bookings on two separate sites, unless you use an aggregator.

Third-party rail aggregators: the multi-country option

A number of third-party booking platforms cover train (and some bus) journeys across Europe, drawing from multiple operators and presenting options in a single interface. Pros:

The downside is a booking fee on top of the operator fare — typically a fixed amount per ticket. For cheap regional trains, this fee can represent a significant proportion of the total cost. For expensive intercity tickets, it is proportionally smaller and may be worth paying for the convenience. These platforms also do not cover every operator: some Eastern European railways and niche operators are not available.

Multi-modal aggregators: booking bus, train and flight together

Some aggregators cover not only trains but also buses, flights and ferries, making them useful if your journey combines modes. Coverage across Europe can be broader than a rail-only aggregator, including operators such as Flixbus. Like rail-only aggregators, they charge a booking fee. The interfaces are typically clean and the mobile apps work well for showing tickets at the gate.

A multi-modal aggregator can be particularly useful when you want to compare train versus bus versus flight on the same search. If you are open to any mode and want to find the cheapest or fastest option quickly, it provides a useful overview — though always cross-check the result against direct booking before committing.

When to use a rail pass booking tool

If you hold a Eurail or Interrail pass, third-party aggregators are not the primary tool. You need to book pass seat reservations through the relevant national operator's website, ÖBB for Nightjet, or a handful of specialist agents. The Interrail and Eurail apps handle pass registration and some reservation booking, but the experience varies by country. See our guide to seat reservations for how reservations work with passes.

Booking tips to get the best fares

Eurostar and international services

The Eurostar (London to Paris, Brussels and Amsterdam) has its own booking site and is also available through third-party aggregators. For a Eurostar journey continuing to a French destination, the Eurostar site allows through-ticketing via SNCF on the French leg. This can save a booking fee and is worth checking.

For other international routes — say Vienna to Rome or Brussels to Madrid — multiple operators are involved, and assembling the journey on DB's international booking tool or a multi-modal aggregator is often the most practical approach, even at a small premium.

Frequently asked questions

Are aggregators cheaper than booking direct?

Usually not — third-party aggregators add a booking fee to the underlying fare. The ticket itself is the same price; you pay extra for the aggregation and convenience. However, occasionally an aggregator shows promotional fares or options not immediately visible on the operator's own site, so it is worth a quick cross-check before concluding the operator is always cheapest.

Can I use a third-party aggregator for trains outside Western Europe?

Coverage varies by platform. Rail-focused aggregators tend to be strongest in the UK, France, Germany, Italy and Spain; multi-modal aggregators sometimes have slightly wider coverage. For Eastern European countries, Japan, India and other rail markets, you will generally need to use the local operator's booking system directly.

What happens if I miss my connection?

This depends on whether you booked a through ticket or two separate tickets. A through ticket (bought as a single booking covering multiple trains) usually means the operator must get you to your destination if a connection is missed due to delay. Two separate tickets mean two separate contracts — the second train will not wait for you. See our guide on disruptions for more detail on your rights.

How do I access my ticket on a phone?

Most operators and aggregators offer e-tickets via app or PDF. On most aggregator apps, tickets are stored in the app and displayed at the gate as a QR code. On some operators — particularly in France and for Eurostar — an app-based ticket is the default. Download tickets before travelling in areas with patchy connectivity.

Sources and further reading: