Most public transport problems abroad happen before you even leave home — wrong app downloaded, contactless not enabled, a zone map you've never seen. Here's the European public transport checklist worth running through from your sofa, so the first 20 minutes after landing aren't spent queueing at a ticket machine.
The problem in practice
Heathrow Terminal 4, 11pm. The Elizabeth line is the obvious next move — except the contactless ticket machine refuses your card because your bank's verification prompt is buried in an app on your phone, and you haven't enabled international roaming. The Oyster window closes at 22:00. The next staffed customer service point is on the platform two floors down, behind the gate you can't get through. You queue 25 minutes at the only working machine, watch three Elizabeth line trains depart, and reach your hotel an hour later than planned.
Every step of this is preventable from your sofa. Add your bank card to Apple Pay before flying. Tell your bank you're travelling. Order a Visitor Oyster card to your home address if your bank card has ever been declined. Total prep time: 15 minutes.
What you need to know
Your phone is your ticket — but only if you set it up beforehand
On most modern European networks, your phone is the fastest way through the gate. But Apple Pay and Google Pay both have setup steps that fail at airports with patchy wifi. Add your bank card to your phone's wallet at home, run a test tap at a shop, and enable Express Transit on iOS (Settings → Wallet & Apple Pay → Express Transit). On the day, you tap. That's it.
Contactless doesn't work everywhere in Europe
Contactless bank cards work in London, Rome (Tap&Go works flawlessly across the system), Amsterdam, Madrid, Milan and the Nordic capitals. In Paris, direct contactless tappings at the gate are not accepted; you need to tap your phone after loading a ticket onto the Île-de-France Mobilités app. Contactless cards do not work in Vienna, Budapest, Prague, and most of Eastern Europe. In those cities, you need either a station-bought card or the local transport app. Check before you fly!
Zones exist, and crossing them costs extra
Large European cities use zone-based fares. A "day pass for Zones 1–2" doesn't cover your trip to the airport, which usually sits in Zone 4, 5 or 6. The cheap-looking pass often excludes the exact journey you're flying in or out on. Read the zone map before you buy.
Apps that look official but aren't
Search "London transport" in the App Store and you get a dozen results. Only one is published by Transport for London. The rest re-skin official data or charge a markup on tickets. Always verify the publisher name on the operator's website (tfl.gov.uk, ratp.fr, tmb.cat) before downloading — not in the App Store description.
Your European public transport checklist before you fly
- Download the official app from the actual transport authority's website — not from a Google search result. The website always links to the right app store entry.
- Add your bank card to Apple Pay or Google Pay, then run a test transaction at a local shop. Confirm it works before you fly.
- Tell your bank you're travelling. Most apps have a one-tap notification screen. This prevents the silent block that gets cards declined at foreign ticket machines.
- Screenshot your route from arrival airport to hotel. Offline backup for the moment your data plan refuses to connect.
- Bookmark the official journey planner of your destination (citymapper.com, tfl.gov.uk, iledefrance-mobilites.fr). Faster than re-searching at the platform.
How three major cities compare
| City | Recommended payment | Where to buy | Contactless bank card works? |
|---|---|---|---|
| London | Contactless (bank card / Apple Pay) | No purchase needed — just tap | Yes, across Tube, bus, DLR, Elizabeth line, Overground |
| Paris | Île-de-France Mobilités app or Navigo Easy card (€2) | App store or any metro ticket machine | Yes, via mobile wallet — direct bank card not accepted at gates |
| Barcelona | Hola BCN Travel Card or T-Casual via T-mobilitat | Online in advance, or the TMB App (digital wallet) | No — bank cards only buy expensive single €2,90 tickets (no transfers); use Hola BCN or T-mobilitat |
⚠️ Common mistake: Downloading a third-party app that mimics the official transport app's name and icon but charges a 15–30% markup on every ticket. Always verify the publisher is the actual operator (TfL, RATP, TMB) on their website before installing.
Roamy's quick checklist
- Add your bank card to Apple Pay or Google Pay at home and confirm it works with a test tap
- Download only the app published by the official transport authority — verify on their website, not in the App Store
- Note the zone of your arrival airport before buying any day pass
- Screenshot your route from airport to hotel — offline backup
For city-specific guidance, start with our London transport guide — the most common first stop for international visitors. A deeper London arrival walkthrough is coming next in this series.