Six hours is enough. Not for a comprehensive city tour, but for a neighbourhood, a meal, and a strong sense of having actually been somewhere. The key variable is not the time. It is the airport.

Airports Worth Leaving

Amsterdam Schiphol is the gold standard for layover city visits. The train to Amsterdam Centraal takes 15 minutes and runs every ten minutes. With six hours you have three and a half to four hours in the city, which is plenty for the Jordaan, a canal walk, and lunch. Frankfurt airport has a direct S-Bahn to the city centre in 11 minutes. Paris is complicated: CDG to central Paris takes 40 minutes on the RER B, which is fine. Orly to central Paris takes about 35 minutes via the Orlyval and RER B combination. Both are manageable. Barcelona El Prat is 35 minutes on the Aerobus. Prague, Lisbon, and Vienna all have fast, direct public transport links and city centres compact enough to navigate quickly.

Airports Not Worth Leaving

Heathrow is not worth leaving for a layover under 8 hours. The Tube takes 45 minutes minimum to reach anything worth seeing, fares are expensive, and the queues at security on return can be brutal. Allow for that and your actual city time collapses to under two hours. Not worth it. Charles de Gaulle in peak hours can also eat your buffer, though off-peak it is fine.

The Two-Hour Return Rule

Whatever you plan, be back at the departures entrance two hours before your flight. Not check-in. Departures. European airports have become less predictable since the pandemic staffing changes, and missing a connection because you were eating lunch in a city centre is not a story with a happy ending. Build two hours of buffer on the return. That means with a six-hour layover you have, realistically, four hours minus travel time. Be honest with yourself about that number before you leave the terminal.

Luggage Storage

Use airport left luggage for anything that will not fit in a day bag. Most major European airports have left luggage facilities in the arrivals hall. Prices range from about six to twelve euros per bag. Book in advance where possible since peak travel periods see queues. Do not attempt to navigate a city with a full carry-on.

Transit Visas for Non-EU

UK passport holders can move freely through EU airports and cities without a visa. Non-EU nationals need to check whether their passport requires a transit visa for the country they are transiting through. This is not the same as an airside transit. If you leave the airport, you are entering the country and standard entry requirements apply. Check before you book the itinerary around the layover.