United Kingdom 4 Day Itinerary (No Traps)
Four days is enough for exactly two bases, not three: two days in London for the icons, then a train north for two more in Edinburgh. That is the honest shape of this trip, and trying to squeeze in Bath or York on top of it turns a good four-day plan into a rushed one. The United Kingdom is four nations, England, Scotland, Wales, and Northern Ireland, and London is only the capital of one of them; Edinburgh is Scotland’s own capital, with its own castle and its own identity, not a regional England outpost. Budget in pounds sterling, never euros, apply for your ETA before you fly, tap contactless everywhere, pack a rain layer no matter what the forecast says, and expect the whole trip to be expensive and, pickpockets aside, very safe.
Book these before you go:
- An Edinburgh Castle skip-the-line ticket : the castle sells out its peak-season timed slots, especially in August when the Fringe fills every hotel room in the city, book the date before you commit to a train time
- A Royal Mile and Arthur’s Seat walking tour : worth booking for your one full Edinburgh day if you would rather have a guide’s pace than work out the route yourself
- A hotel in Edinburgh : rooms get scarce and pricey around the Fringe (7-31 August) and most weekends, book this leg as soon as your travel dates are fixed
| Day | Focus | Base or train | Rough daily spend (GBP) |
|---|---|---|---|
| 1 | Westminster, Buckingham Palace, Tower of London | London | 70-120 |
| 2 | British Museum (free), South Bank, West End show | London | 60-150 |
| 3 | LNER train to Edinburgh (~4h8m), Castle and the Royal Mile | London to Edinburgh (train) | 90-150 |
| 4 | Arthur’s Seat, then home (train back or fly from Edinburgh) | Edinburgh | 60-130 |
Day 1: Westminster, Buckingham Palace, and the Tower of London
Start at Westminster Abbey and the Elizabeth Tower, the bit everyone calls Big Ben though that is technically the bell inside it, both a short walk from the Houses of Parliament. Time it for the Changing of the Guard at Buckingham Palace if the seasonal schedule lines up with your date, worth checking the week before you fly rather than trusting an old itinerary. Tap a contactless card or phone at any Tube reader; it charges the same daily fare cap as an Oyster card and needs no ticket machine queue.
Give the afternoon to the Tower of London: close to a thousand years of continuous use as a fortress and a prison, the Crown Jewels behind glass, and Yeoman Warder tours that are funnier than the ticket price suggests. Book a timed entry slot in advance, especially April through August, rather than queuing at the gate.
Day 2: Free museums, the South Bank, and a West End show
The British Museum charges nothing to get in, which might be the single best fact in this whole country for a budget-conscious traveler: the Rosetta Stone and the Parthenon sculptures for free. Reserve a timed slot online in peak season so your morning does not disappear into a queue. The National Gallery and Tate Modern are also free for their permanent collections; pick one rather than trying to force both into an afternoon.
Walk the South Bank from Tower Bridge past Borough Market to the Globe and Tate Modern, with the London Eye there if you want the view and don’t mind the ticket price. Book a West End show for the evening instead of hoping for a walk-up seat; the good ones sell out days or weeks ahead, and 6pm at the box office is not where you want to be deciding what to watch.
Day 3: The 4-hour train to Edinburgh, then the Castle
This is the day the itinerary earns its “no traps” title: skip flying, skip driving, and book an LNER advance ticket from London King’s Cross to Edinburgh Waverley, around 4 hours 8 minutes, standard advance fares from roughly £34-35 one-way if you book ahead rather than turning up on the day. It is a genuinely comfortable ride, city center to city center, and it avoids London’s Congestion Charge (£18/day) and ULEZ (£12.50/day) altogether, charges that stack to roughly £30.50 for anyone who drives into the capital instead.
Land in Edinburgh by early afternoon and go straight to Edinburgh Castle, perched above the city, then walk the Royal Mile down toward the Palace of Holyroodhouse. If your dates land in the 7-31 August Fringe window, the whole city turns into a festival, book your castle slot and your hotel further ahead than you would for any other UK city on this list.
Day 4: Arthur’s Seat, and the trip home
Climb Arthur’s Seat in the morning: an extinct volcano with a walkable summit and a view over the whole city, no technical hiking gear needed, just decent shoes. It is a genuinely different landscape from anything London offers, and it is the reason Edinburgh, not Bath or York, is the strongest “one more base” pick for a first four-day trip.
Then decide how you are getting home. If your return flight is out of London, book the return LNER train earlier in the day rather than the last one out; if it is not, Edinburgh Airport has its own direct international connections, and flying out from there instead of backtracking to London by train is a genuinely underused option worth checking before you assume you have to retrace your route.
Four days is tight for two bases; five gives you slightly more breathing room in Edinburgh, and six or seven can add a Highlands day trip or a stop in York on the way north. See the 5-day , 6-day , and 7-day versions of this trip for that. If four days is more than you have, the 2-day and 3-day itineraries stay in London only and drop Edinburgh entirely.
Do you need an ETA for the UK?
Yes, almost certainly. The UK Electronic Travel Authorisation is now required before you board for most visa-exempt visitors, including US, Canadian, Australian, and (since April 2025) EU nationals. Apply through gov.uk, roughly £20 as of 2026 though confirm the current fee before you pay, and apply at least a few days before you fly. British and Irish citizens travel without one.
Is the UK on the euro?
No, and it never has been. The UK uses the pound sterling (GBP, £), not the euro, even though some travelers still expect otherwise after Brexit. Don’t confuse this with the Republic of Ireland, a separate country that does use the euro; Northern Ireland, by contrast, is part of the UK and uses sterling. Contactless works nearly everywhere here, and displayed prices already include 20% VAT, with no tourist VAT refund in Great Britain since Brexit.
Is 4 days enough for London and Edinburgh?
Enough, not generous. Two days covers London’s core icons and free museums properly; two more gets you Edinburgh Castle, the Royal Mile, and Arthur’s Seat, but little else in the city. It works because the train makes the join fast and comfortable, not because four days is genuinely a lot of time for two capital cities in two different nations.
Book the London-Edinburgh train the moment your dates are fixed. Advance fares get more expensive, not less, as the travel date gets closer, and the cheapest tickets on the route sell out well before the train itself is full. That one booking, done early, does more for this itinerary’s budget than anything else on this list.