How to plan a Europe trip with AI without booking a hotel that doesn't exist

What AI does well in trip planning

Language models are good at the part most people find tedious: the first draft. They can compare a rail corridor with a flight, suggest three bases instead of six, and turn a vague wish list into something you can argue with. They are fast at restructuring: ask for the same trip at half the budget and you get an answer in seconds.

They are weak at anything that has to be current or exact. Timetables, ticket prices, opening hours and whether a restaurant still exists are facts that change weekly. A model trained months ago will answer confidently anyway.

Give the model a brief, not a wish

"Plan me a trip to Europe" produces a postcard. The quality of the answer depends almost entirely on the constraints you supply. Include dates, starting city, how you want to move between countries, a hard budget figure in euros, the number of bases you can tolerate, and anything physical or dietary that limits the plan.

A brief that works:

Plan a 14-night trip for two adults in September, flying out of Prague, trains only once we arrive. Budget €2,000 per person excluding flights. We like architecture, food markets and long walks. No more than three bases. One of us cannot manage more than 8,000 steps a day. Give me three route options with the trade-offs, then a day-by-day plan with travel times, then a budget table in euros. Mark anything you are not certain about as "check this".

That last line matters more than it looks. Asked to flag uncertainty, most assistants will admit that a museum's opening hours or a specific fare needs verifying. Without it, the same claim arrives with no warning attached.

Build the itinerary in three passes

The skeleton

Ask for routes first, not days. Three options, each with the total time spent on trains, the number of hotel changes and the reason to pick it. This is where an assistant is genuinely faster than a person with a map, because it will propose combinations you had not considered, such as entering through Vienna and leaving from Ljubljana instead of returning to the same airport.

The days

Once you have chosen a route, ask for one city at a time. A single long conversation about the whole trip produces generic filler by day four. A separate prompt per city, with the arrival and departure times stated, produces something closer to usable.

The stress test

Then ask: "Which day in this plan is most likely to go wrong, and why?" Assistants are surprisingly good at this. They will spot the 6:40 train after a late dinner, the Sunday arrival when everything is shut, or the day that quietly requires two separate metro journeys with luggage.

A budget you can check line by line

Language models do arithmetic unreliably. They can also use a calculator tool now, which helps, but the structure of the budget is more valuable than the total. Here is a template for a two-person, 14-night rail trip through Central Europe at a mid-range level. The numbers are our own working assumptions, not a quote, and they exclude flights.

Feed this table back to the assistant and ask it to recompute the daily rate, name the largest line, and propose two swaps that save €200 without cutting a night. Then check the arithmetic yourself. Prices for the Interrail pass vary by age, class and promotions, so look up the current figure at interrail.eu rather than accepting the model's number.

Currency is its own trap. Czechia, Poland, Hungary and Switzerland sit outside the euro, and card fees vary by bank. Ask for a plan that assumes card payment everywhere and carry a small cash reserve for the places that do not.

Six mistakes that cost money

Invented hotels and closed restaurants

Models mix up names, merge two similar businesses and place restaurants on the wrong street. Anything you intend to book has to be found on a map and a booking site first. A name that appears in three AI-generated lists and nowhere else is a warning sign, not a recommendation.

Confident arithmetic

A plan that says "roughly €1,600 for two weeks" can be off by hundreds. Ask for the formula, then use a calculator. Splitting costs per person and per night catches most errors.

Seat reservations and night trains

Rail passes cover the ticket, not always the seat. High-speed routes in France, Italy and Spain and most night trains require a paid reservation, and popular ones sell out. A generated plan that lists six train legs in five days without mentioning reservations is incomplete.

Local calendars

Museums close on Mondays in many cities. Italy empties in mid-August, and small family businesses shut for weeks. National holidays change transport schedules. None of this appears in a generic itinerary unless you ask about it directly.

Data you should not paste

There is no reason to give a chatbot a passport number, a booking reference or a home address. Under the GDPR you keep rights over what a provider stores, including access and erasure, but the simpler habit is to paste the itinerary and not the identity documents. Health details count as special-category data, so describe the need, not the diagnosis: "cannot walk more than 8,000 steps" is enough. Memory features can carry trip details into later conversations, so check the settings before you start.

Assuming you are covered

A chatbot's suggestion is not a travel agent's advice. If you book a flight and a hotel separately, the protections of the EU Package Travel Directive do not apply to your combination. Air delays and cancellations fall under Regulation (EC) 261/2004, and rail journeys have their own rules: 25% of the ticket price for a delay of 60 minutes or more, 50% from 120 minutes on international services. An assistant can explain these rights, but the claim is yours to file.

What EU rules give you here

The AI Act's transparency rules have applied since 2 August 2026. Providers must disclose that you are interacting with an AI system. A disclosure label tells you that you are talking to an AI, not that its facts were checked; national market-surveillance authorities are only now starting enforcement.

Two practical consequences. First, treat every specific fact in a generated plan as unverified until you see it on a site run by the operator, the city or the venue. Second, check in the local language when you can. Czech, Polish and Italian railway sites list connections and fares that the English version sometimes hides.

Tools and prices in Europe

The free tiers are enough for a two-week trip. If you pay for one month, pay for it in the month you are planning and cancel afterwards. All of these services are available across the EU and handle the main European languages; output quality in Czech or Polish is decent for planning and still worth checking for place names.

For train times, the operators beat the assistants every time: DB, ÖBB, SBB, SNCF Connect, Trenitalia and the Czech IDOS system are the reference points. We look at how assistants handle this kind of structured checking in our magazine coverage of AI tools.