Heathrow To Windsor Castle: How To Get There In 2026

Heathrow to Windsor: The Closest Castle to the Airport

Here's something most visitors to London never realise. Windsor Castle — the oldest occupied castle in the world, official residence of the King, the one with the Changing of the Guard — sits under ten miles from Heathrow. It's closer to the airport than most central London hotels.

That single fact makes Windsor unusually useful. It works as a first stop before you've even reached London, as a last day before an evening flight, and, if you've got the hours, as a genuine layover excursion. Very few major attractions anywhere are this close to a major airport.

This guide covers how to make the trip, and — more usefully — the two scheduling traps that catch people out.

How far is it?

Roughly eight to ten miles by road, which is 20 to 30 minutes in normal traffic. The M4 and M25 both connect the two, and the route rarely suffers the congestion that makes airport-to-London journeys unpredictable.

Getting there
The Green Line 703 bus

The simplest option. It runs direct from Heathrow Terminal 5 to Windsor town centre with no changes, takes around 60 minutes, and costs about £3 under the national fare cap.

Note that it goes from Terminal 5 only. If you land at T2, T3 or T4 you'll need to reach T5 first on the free inter-terminal transport, which adds 15 to 20 minutes.

An hour on a bus for an eight-mile journey tells you it isn't a direct run — it takes a local route. But for three pounds, with a drop-off a short walk from the castle gates, it's hard to argue with.

By train

There's no direct service. You'll take the Elizabeth line from Heathrow, change at Hayes & Harlington onto a westbound service to Slough, then take the shuttle from Slough to Windsor & Eton Central — a six-minute hop that deposits you almost at the castle wall.

In practice, with two changes and waiting time, budget 45 minutes to an hour. It's fine with hand luggage. It's a nuisance with suitcases, and the Slough change involves a footbridge.

By car

Twenty to thirty minutes, door to door, with your luggage in the boot rather than on your lap.

The reason this matters more at Windsor than elsewhere is simple: the castle has no visitor car parking. Neither does much of central Windsor. If you're in a hire car you'll be paying for a town-centre long-stay car park at Romney Lock or Alexandra Gardens and walking in — which rather undermines the convenience of having driven.

A pre-booked car sidesteps that entirely. You're dropped at the castle and collected from it. If you're arriving on a flight and heading straight there, it's worth checking the fixed price on our Heathrow to Windsor Castle transfer page before you commit to dragging cases through Slough station.

Staying elsewhere in Berkshire rather than Windsor itself? A Heathrow to Bracknell taxi covers the corridor south-west of Windsor, which is where a lot of business travellers actually end up.

Trap one: the castle isn't open every day

Windsor Castle is normally open Thursday to Monday and closed on Tuesdays and Wednesdays.

This catches an extraordinary number of people, because it's not the pattern most attractions follow. Turn up on a Tuesday and you'll find a very nice town, a river, and a locked castle.

A few more dates to know:

St George's Chapel is closed to visitors on Sundays, as services run through the day. The castle itself is open, but if the chapel is the thing you want to see — and for many people it is — Sunday is the wrong day.
The castle closes entirely at short notice several times a year for state functions and royal events. It's a working palace, not a museum. The Royal Collection Trust publishes a provisional closure calendar, but not always with much warning.
Specific 2026 closures include 16 June and 25–26 December.

Check rct.uk before you book anything, and particularly before you book a car to get there.

Trap two: Changing the Guard falls on a closed day

Here's the awkward one. In 2026 the Changing of the Guard at Windsor is provisionally scheduled for Tuesdays, Thursdays and Saturdays — and the castle is closed on Tuesdays.

So a Tuesday visit lets you watch the New Guard step off from Victoria Barracks at around 10:45 and march up the High Street, which is genuinely worth seeing and costs nothing. What it won't let you do is go inside.

If you want both the ceremony and the State Apartments, aim for a Thursday or a Saturday. That's the combination, and it's not obvious from either schedule on its own.

Worth knowing too: the ceremony can be cancelled in wet weather, when the Guards march without the band. The decision comes late, so there's no way to check in advance.

Does it work as a layover trip?

Yes, but be honest about the hours.

To go inside the castle, you want at least eight hours between landing and your next departure. That covers immigration and baggage, the journey out, two to three hours at the castle (which is the realistic minimum — it's a large site), the journey back, and being at your gate on time.

For the town only — the riverside, the High Street, Eton across the bridge, lunch, and the Guard if it's running — six hours is workable.

Under five hours, don't. You'll spend the whole time watching the clock.

Two practical warnings for layover visitors:

You must be able to enter the UK. Leaving the airport means clearing immigration properly. Depending on your nationality you may need a visa or an Electronic Travel Authorisation, and you need to sort that before you fly, not on the day.

Your bags need somewhere to go. Heathrow has left-luggage facilities in each terminal. Factor the cost and the walk into your timings.

If your layover is tight or your flight lands late, book your transfer in advance rather than gambling on the bus timetable — the 703 doesn't run frequently enough to absorb a delayed arrival.

What else is nearby

Eton College sits across the footbridge from Windsor, about ten minutes' walk. The town of Eton is worth the stroll even if you don't tour the college.

Windsor Great Park stretches south from the castle. The Long Walk gives you the postcard view back towards it, and it's free.

Legoland Windsor is a couple of miles out and a completely different sort of day — worth knowing if you're travelling with children and Windsor was going to be the compromise destination anyway.

When to go

Weekday afternoons are quietest. The Royal Collection Trust's own advice is that the castle is busiest from opening through the morning, and again straight after the Guard ceremony, so arriving after midday gives you a calmer visit.

October to March brings a bonus: the Semi-State Rooms — George IV's private apartments, and among the most lavishly decorated parts of the castle — join the visitor route at no extra cost. They close over the summer. If you have a choice of season and you care about interiors, winter is the better visit, crowds and all.

Common questions

How far is Windsor Castle from Heathrow? Eight to ten miles, or 20 to 30 minutes by road. It's closer to the airport than central London.

Is there a direct bus from Heathrow to Windsor? Yes — the Green Line 703 runs direct from Terminal 5 to Windsor town centre in about 60 minutes for around £3. Passengers at other terminals need to reach T5 first.

Is there a direct train? No. You'd travel via Hayes & Harlington and Slough, with two changes, taking 45 to 60 minutes in total.

What days is Windsor Castle closed? Tuesdays and Wednesdays, plus occasional short-notice closures for royal and state events. St George's Chapel is also closed to visitors on Sundays.

Can I visit Windsor Castle on a layover? Yes, with at least eight hours between flights to go inside, or six for the town alone. You'll need to clear UK immigration, so check whether your nationality requires a visa or ETA.

How long do I need at Windsor Castle? Two to three hours for the main highlights. Add roughly 45 minutes if you're watching the Changing of the Guard.

Worth the trip?

For a town this close to a major international airport, Windsor is a remarkably good use of a spare day — or half of one. The castle is the real thing rather than a tourist reconstruction, the river and Eton give you somewhere to go afterwards, and you're never more than half an hour from your terminal.

Just check the calendar first. Thursday or Saturday, arriving after midday, gets you the most out of it.

Related Links:
Heathrow to Windsor Castle transfer
Heathrow to Bracknell taxi

###

Sponsor Message

Canadian pharmacies are a trusted choice for affordable medications, including Lipitor, Crestor, and Nexium. Insulin options such as Humalog and Lantus are key for diabetes care, while Advair Diskus and Ventolin inhalers help manage chronic respiratory conditions. Medications such as Zoloft, Prozac, and Abilify help with mental health disorders, while blood thinners like Eliquis, Plavix, and Xarelto provide crucial stroke prevention. Popular drugs for pain relief, such as Celebrex, and for thyroid replacement, like Synthroid, are often ordered by patients. Additionally, Viagra and Cialis are common treatments for erectile dysfunction, while Januvia plays a critical role in managing Type 2 diabetes. Excessive sleepiness and narcolepsy can be effectively managed with medications like Provigil and Nuvigil. Canadian pharmacies offer a broad selection of affordable medications, including Cymbalta for nerve pain and Aricept for Alzheimer's, to benefit patients throughout the United States.