Heathrow to Windsor Castle: The Fastest & Cheapest Routes
The easiest way from Heathrow to Windsor Castle is the Green Line 703 bus from Heathrow Terminal 5, which takes approximately 60–65 minutes and drops you near Windsor town centre. No changes required. By train, take the Elizabeth Line from Heathrow Terminals 2 & 3 to Slough (approximately 20 minutes), then change to the local GWR service to Windsor & Eton Central (approximately 7–10 minutes) — total approximately 30–35 minutes. By taxi or private transfer, the drive is approximately 8–9 miles and takes around 20–25 minutes in normal traffic.
Windsor Castle sits just 8–10 miles from Heathrow Airport — closer than most central London hotels. This makes it a genuinely practical option for visitors with a long layover, those spending a first or last night near the airport, or anyone whose itinerary begins or ends in the west of London. The proximity is one of Windsor’s least advertised advantages as a day trip destination.
Route 1: Green Line 703 Bus (Easiest, No Changes)
From: Heathrow Terminal 5 bus stops (stands 7/8 outside arrivals) Journey time: Approximately 60–65 minutes Frequency: Regular service throughout the day Fare: Approximately £3 single under England’s national bus fare cap (subject to continuation) Drop-off: Windsor town centre / Theatre Royal — a short walk to the castle entrance
The Green Line 703 (Windsor Express) is the simplest route from Heathrow to Windsor. Board at Terminal 5 and ride directly to Windsor with no changes. Terminals 1, 2, and 3 passengers can take a free inter-terminal shuttle or local bus to Terminal 5 to access this service, or use the bus options from the central bus station (see Route 2 below).
This is the recommended option for visitors not comfortable with train changes, those travelling with luggage, or anyone arriving early in the morning before train connections are convenient.
The Green Line 703 bus from Heathrow Terminal 5 is the simplest option — no changes, approximately 60 minutes, drops near the castle. For the fastest route, take the Elizabeth Line to Slough (approximately 20 minutes) and change to the local GWR train to Windsor & Eton Central (7–10 minutes). Total journey approximately 30–35 minutes.
Route 2: Bus via Heathrow Central Bus Station
From: Heathrow Central Bus Station (serving Terminals 2 & 3) Service: Local bus to Slough (frequent service, approximately 25 minutes), then connect to Windsor Journey time: Approximately 45–55 minutes including transfer Fare: From approximately £3 under the fare cap
From the Heathrow Central Bus Station (which serves Terminals 2 and 3), services run regularly to Slough. From Slough you can take either the local Green Line bus or the GWR train the remaining few minutes to Windsor. This is a viable alternative for passengers arriving at Terminals 2 or 3 who prefer not to travel to Terminal 5.
Route 3: Train — Elizabeth Line to Slough then GWR to Windsor (Fastest)
From: Heathrow Terminals 2 & 3 station (Elizabeth Line) Route: Heathrow Terminals 2 & 3 → Slough (Elizabeth Line, approximately 20 minutes) → Windsor & Eton Central (GWR local service, approximately 7–10 minutes) Total journey time: Approximately 30–35 minutes including the connection at Slough Frequency: Elizabeth Line runs every few minutes; Slough–Windsor connection every 30 minutes Fare: Approximately £6–10 return for the full journey Walk to castle: 5 minutes, flat from Windsor & Eton Central
This is the fastest public transport route from Heathrow to Windsor. The Elizabeth Line serves Heathrow Terminals 2 & 3 directly; Terminal 5 passengers can take the Heathrow Express or shuttle to Terminal 2 & 3 for the Elizabeth Line, or use Route 1 instead.
Important note on fares: The Elizabeth Line portion (Heathrow to Slough) is covered by contactless payment and Oyster if you are travelling from within London. However, the Slough–Windsor section is outside the London fare zones — you will need a separate rail ticket for this leg, purchased at Slough station or in advance. Do not pass through the barriers at Slough without a valid ticket for the Windsor section.
Timing the connection: The Slough–Windsor local service runs approximately every 30 minutes. Check the GWR timetable before travel — arriving at Slough just after a Windsor train has departed means a 30-minute wait.
Route 4: Taxi or Private Transfer
Journey time: Approximately 20–25 minutes in normal traffic Distance: Approximately 8–9 miles Cost: Approximately £25–40 by metered taxi; private transfer costs vary
For families with children and luggage, groups of three or more, or visitors with limited mobility, a taxi or pre-booked private transfer is often the most practical option. The short distance keeps costs reasonable, and a direct door-to-door transfer from your terminal to the castle removes all navigation concerns.
Pre-booking a private transfer is recommended for early morning arrivals when taxis may be less readily available. Several private transfer operators serve the Heathrow–Windsor route.
Route Comparison
| Route | Journey Time | Fare (single) | Changes | Best For |
|---|---|---|---|---|
| Green Line 703 from T5 | ~60–65 min | ~£3 | None | Simplicity, budget, luggage |
| Bus via Central Bus Station | ~45–55 min | ~£3 | 1 | Terminals 2 & 3 passengers |
| Train (Elizabeth Line + GWR) | ~30–35 min | ~£6–10 | 1 (at Slough) | Speed |
| Taxi / private transfer | ~20–25 min | ~£25–40 | None | Families, groups, luggage |
Is Windsor Castle Worth Visiting on a Heathrow Layover?
For a layover of 8 hours or more after landing: yes, very comfortably. Even accounting for clearing customs, collecting baggage, and travelling to the castle, a layover of that length allows 2.5 to 3 hours inside Windsor Castle and a return to the airport with time to spare.
A realistic layover schedule: – Clear arrivals and collect baggage: 60–90 minutes after landing – Travel to Windsor (train route): 35 minutes – Visit Windsor Castle: 2.5 hours (State Apartments, St. George’s Chapel, Queen Mary’s Dolls’ House) – Return to Heathrow (train): 35 minutes – Airport return buffer: 2 hours before departure
Total: approximately 8–9 hours from landing to returning airside — a tight but achievable day on a 10-hour layover, and comfortable on anything longer.
Book your Windsor Castle entry ticket in advance. Windsor operates timed-entry ticketing and can sell out, particularly at peak times. Advance booking also saves approximately £4 per adult over the walk-up price. See our Windsor Castle Entry Ticket guide.
Practical Tips for Heathrow Visitors
Check the castle’s opening day before you plan. Windsor Castle is closed on Tuesdays and Wednesdays (except July–September when it’s closed Wednesdays only). St. George’s Chapel is closed on Sundays. If your layover falls on a closure day, the visit is not possible.
Travel light. Windsor Castle does not permit large suitcases or heavy luggage inside the State Apartments. A cloakroom is available near the State Apartments entrance — plan for approximately 10 minutes to get there from the admission centre. If you are travelling with checked luggage, consider a left-luggage service at Heathrow before departing for Windsor.
The castle sits at the top of a hill. Both Windsor train stations require some walking, and the castle itself sits at the top of Castle Hill. The walk from Windsor & Eton Central station (the train route) is approximately 5 minutes on relatively flat ground. From Windsor & Eton Riverside (the Waterloo route, not recommended from Heathrow) the walk involves a steeper climb.
Frequently Asked Questions
How long does it take to get from Heathrow to Windsor Castle?
By Green Line 703 bus from Terminal 5: approximately 60–65 minutes. By train (Elizabeth Line to Slough, then GWR): approximately 30–35 minutes. By taxi: approximately 20–25 minutes.
Is there a direct bus from Heathrow to Windsor Castle?
Yes. The Green Line 703 (Windsor Express) runs directly from Heathrow Terminal 5 to Windsor town centre with no changes required. Journey time is approximately 60–65 minutes.
Can I visit Windsor Castle on a Heathrow layover?
Yes — with a layover of 8 hours or more after landing. A 10-hour layover is comfortable; shorter layovers are possible with the train route but leave little margin for delays. Book your castle ticket in advance and travel light.
Do I need to book Windsor Castle tickets in advance from Heathrow?
Yes — strongly recommended. Windsor Castle uses timed-entry ticketing and can sell out. Advance booking also saves money. Book at rct.uk/visit/windsor-castle or via a third-party platform.
What terminal does the 703 bus leave from?
The Green Line 703 departs from Heathrow Terminal 5. Passengers arriving at Terminals 1, 2, or 3 can reach Terminal 5 via the free Heathrow inter-terminal shuttle (approximately 10–15 minutes).
