What to book ahead in London, and what you can just walk into

The list of what to book in advance in London is short, because the British Museum and the National Gallery are free and take walk-ins. The Tower of London sells tickets at its ticket office on the day, but booking settles the morning before you arrive. Westminster Abbey says advance booking is "highly recommended". St Paul's Cathedral needs a paid sightseeing ticket. Sky Garden is free, with tickets released three weeks ahead. The London Eye costs £10 less online. And in winter, Buckingham Palace opens only for small paid guided tours. Every rule below links to the official page that sets it.

Last checked: Nov 2026. Rules, hours and prices change, so open the official page before you buy.

What to book in advance in London: the table

Book these ahead: the ones that fill or need a ticket

Tower of London

The Tower's ticket page gives you both options: "Book a ticket in advance online or purchase tickets on the day at the ticket office." So you can walk up. If the Tower anchors your day, book anyway: the online ticket arrives as a PDF you scan at the entrance.

Hours change through the year, and the opening times page lists them day by day. On Sunday 1 November 2026 it showed 09:00 to 16:30, last entry 15:00, with the last Yeoman Warder tour (included in your ticket) at 14:30. The Tower says it's quieter after midday and suggests two to three hours for a visit. Prices aren't quoted here because they vary by date. Check the ticket page for yours.

A few upgrades are only worth it on certain weekdays. The Ravens experience runs early on Wednesdays and Fridays and skips the admission queue. The Keys Club talk with a Yeoman Warder is for Monday, Tuesday and Thursday visits. The Opening Ceremony ticket gets you in early and first in line for the Crown Jewels.

Westminster Abbey

The Abbey's visit page says "Advanced booking is highly recommended to guarantee entry during busy periods." It's open for visitors 9:30am to 4:30pm on weekdays (last entry 3:30pm) and 9:00am to 4:00pm on Saturday (last entry 3:00pm). On Sunday it's open for services only, so sightseeing is off that day.

The prices page lists adults at £32, over 65s and students at £29, and children 6 to 17 at £14, with under 5s free. Buy online on the Abbey's own site and you can upgrade the ticket to an annual pass at no cost, which covers three visits. The Abbey is a working church and its calendar shows closures day by day, so check your date.

St Paul's Cathedral

Services at St Paul's are free. To walk round the building as a sightseer you need a ticket, and the visit page prices Monday to Saturday sightseeing at £27 for adults and £10.50 for children. Sightseeing opens at 8.30am, last entry is usually 4pm, and the Dome Galleries open at 9.30am with last entry at 4.15pm. Sightseeing is Monday to Saturday. Whether tickets are also sold at the door isn't on that page, so check before you go if you'd rather decide on the day.

Sky Garden

Sky Garden, at the top of 20 Fenchurch Street, is free, but you book a time. The booking page releases free tickets up to three weeks in advance, and each one is good for its date and time, with a one-hour limit once you're in. Free access runs 10am to 6pm on weekdays and 11am to 9pm at weekends.

Walk-ins happen if there's space, but the garden says there's no ideal time for them and "we always recommend booking a ticket in advance." On weekdays there are no walk-ins after 5pm. A restaurant booking up there counts as your access, so you don't need a separate ticket.

Buckingham Palace

The State Rooms open to visitors in summer only. For the rest of the year, the Royal Collection Trust opens the palace on selected dates for small-group tours. This winter that's the East Wing Exclusive Guided Tour, 6 November 2026 to 31 January 2027, at £100 per person, which the trust calls "the only way to visit Buckingham Palace during the winter months." If you want the summer State Rooms, the trust says £1 tickets for summer 2027 (for people on Universal Credit and other named benefits) come out in November.

The King's Gallery next door opens daily and the Royal Mews Thursday to Monday, per the same page.

Warner Bros Studio Tour London

The Harry Potter studio tour sells its tickets on the official site, where they start at £58.50. Opening times vary through the year, and the site asks you to check its calendar before you book. Whether same-day tickets exist isn't on that page, so check before you go. For a fixed date, book it first and build the rest of the trip around it.

Cheaper online: the London Eye

The London Eye is the clearest case of booking to save money. The official tickets page lists a standard adult ticket from £29 online and £39 at the walk-up desk, and a Flexi Fast Track ticket from £49 online against £54 walk-up. You can turn up and ride, but the standard ticket costs £10 more a head at the desk.

Walk right in: the free museums and the guard

British Museum

Entry to the British Museum is free. It's open daily 10.00 to 17.00, to 20.30 on Fridays, and closed 24 to 26 December. You can book a free ticket for museum entry in advance, which the museum says gets you "priority entry during busy periods" plus visit updates by email. Ticketed exhibitions cost extra and are the part worth booking.

National Gallery

The National Gallery is free, with a charge for some exhibitions. It opens daily 10am to 6pm and until 9pm on Fridays, and closes 24 to 26 December and 1 January. A free ticket gets you fast-track entry, and the gallery says "Walk-up entry is also available." Exhibition tickets include general admission.

Changing the Guard

The King's Guard changes at Buckingham Palace on Monday, Wednesday and Friday at 11am, and the Windsor Castle guard on Tuesday, Thursday and Saturday, per the Household Division calendar. It happens outdoors and the calendar lists no ticket. The calendar is dated, so check that your day is on it before you plan a morning around it.

Day-of-week traps that change what you book

A booking only helps if the place is open. These come from the pages above:

• Sunday: Westminster Abbey is open for services only, and St Paul's sightseeing runs Monday to Saturday.
• Friday: the British Museum stays open to 20.30 and the National Gallery to 9pm, so Friday evening is a good slot for one of them.
• Monday, Wednesday, Friday: the King's Guard at Buckingham Palace. The Royal Mews is closed Tuesday and Wednesday.
• Winter: the Buckingham Palace State Rooms are shut until summer (guided tours only), and the Tower's last entry on 1 November was 15:00.
• Weekday evenings: Sky Garden takes no walk-ins after 5pm, so book if you want the sunset.

If you have one weekday for the big three paid sights, put Westminster Abbey and St Paul's in the morning and the Tower after midday, when it's quieter.

How I checked a London day for what to book ahead

I built a one-day London trip in Passage AI for Thursday 12 November 2026, west to east: Westminster Abbey, the British Museum, St Paul's Cathedral, the Tower of London and Sky Garden. On a Thursday the Abbey and St Paul's are both open for sightseeing and Sky Garden runs its free weekday hours. The Tower lists its opening times date by date, so check yours on its page.

The legs between stops are 28 minutes from the Abbey to the British Museum, 26 to St Paul's, 21 to the Tower and 8 to Sky Garden. Walk times are straight-line estimates between stops, and Directions opens your phone's maps app for the street route.

The Need tickets? scan

Need tickets? reads the trip and lists the stops worth booking ahead, each with a short reason, a confidence tag and a link to the official site. You book on that site yourself. On this day it marked Westminster Abbey, the Tower of London and Sky Garden as likely, and St Paul's and the British Museum as maybe.

That lines up with the official pages above. Sky Garden releases its free tickets three weeks out and takes no weekday walk-ins after 5pm. The Abbey recommends booking. St Paul's needs a paid ticket for sightseeing, and the British Museum is free, with ticketed exhibitions as the part to book.

Optimize

Optimize looks for an order with less walking and shows it before changing anything. Here it found 8 minutes less walking by going to Sky Garden before the Tower. Both orders work. I kept the Tower fourth because the Tower says it's quieter after midday, and Sky Garden makes a good last stop as the light goes. Tap Apply new order if you'd rather take the shorter walk.

On the day

Guide opens each stop with a story, and Listen reads it aloud. The Westminster Abbey story starts in Dean's Yard, the quiet green quadrangle behind the Abbey's west towers. Your saved trip plans also open without a signal.

FAQ

Do you need to book the Tower of London in advance?

You don't have to. The official ticket page sells tickets online in advance and on the day at the ticket office. Booking ahead gives you an e-ticket to scan at the entrance and one less thing to sort out on the day.

Can you just walk into the British Museum?

Yes. Entry is free and walk-ins are welcome. A free advance ticket gets you priority entry during busy periods. Ticketed exhibitions cost extra.

Is Westminster Abbey open on Sundays?

For services only. Sightseeing is Monday to Saturday, and the Abbey says advance booking is "highly recommended" to guarantee entry during busy periods.

Is the London Eye cheaper online?

Yes. The official site lists a standard adult ticket from £29 online and £39 walk-up.

Can you visit Buckingham Palace in winter?

Only on a guided tour. The State Rooms open in summer. From 6 November 2026 to 31 January 2027 the East Wing Exclusive Guided Tour costs £100 per person and has to be booked through the Royal Collection Trust.

How this was made: planned in Passage AI on 1 Nov 2026, facts checked against the official sites of the Tower of London (Historic Royal Palaces), Westminster Abbey, St Paul's Cathedral, Sky Garden, the London Eye, the Royal Collection Trust, the Warner Bros Studio Tour, the British Museum, the National Gallery and the Household Division, written by Edward.

Cover photo: King of Hearts on Wikimedia Commons (CC BY-SA 4.0, cropped)