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The Route — 38 Miles, Two Motorways, No Shortcuts
Heathrow sits to the west of London in the Borough of Hillingdon. Gatwick sits to the south in West Sussex, just north of Crawley. The two airports are on completely different sides of the city, connected by the M25 orbital — the only motorway that links them. There is no cross-London shortcut that avoids the M25; any route through central London adds time, traffic lights, and congestion that makes the journey longer, not shorter.
The standard road route follows the M25 clockwise from Junction 14 (Heathrow) through Junctions 13 down to 7, where the M23 begins heading south to Gatwick at Junction 9. The total distance is 38 to 40 miles depending on which Heathrow terminal you start from. Terminal 5 sits closest to the M25 entry and adds the shortest distance. Terminal 4 sits furthest east and adds roughly 2 extra miles, though the difference in driving time is under five minutes.
Heathrow operates four active passenger terminals. Terminal 2 (The Queen's Terminal) serves Star Alliance carriers including Lufthansa, United, and Singapore Airlines. Terminal 3 handles Virgin Atlantic, American Airlines, Emirates, and Qantas. Terminal 4 serves KLM, Malaysia Airlines, and several Gulf carriers. Terminal 5 is exclusively British Airways. All four terminals are connected by a free inter-terminal transfer bus. Gatwick has two terminals — North and South — linked by a free monorail that takes about 3 minutes.
If you are connecting between flights at these airports, the critical number is not the road distance — it is the minimum connection time you can safely work with. Each transport method has a very different risk profile, which is what the rest of this guide is designed to help you evaluate honestly.
All Four Methods — Side by Side
| Method | Off-Peak | Peak | 1 Person | 4 People | Direct? | 24/7? |
|---|---|---|---|---|---|---|
| Pre-booked taxi | 45–60 min | 60–90 min | £69–£95 | £69–£95 total | Yes | Yes |
| National Express coach | 75–90 min | 90–120 min | £20–£30 | £80–£120 | Yes | No |
| Elizabeth Line + Thameslink | 85–100 min | 100–120 min | £26–£32 | £104–£128 | 1 change | No |
| Heathrow Exp + Gatwick Exp | 90–110 min | 110–130 min | £40–£55 | £160–£220 | 2 changes | No |
| Self-drive (M25/M23) | 45–60 min | 75–120 min | £30–£50+ | £30–£50+ | Yes | Yes |
Fares as of May 2026. Taxi fares are per vehicle, not per person. Train and coach fares are per person. Peak: weekdays 7–10am and 4–7pm.
Pre-Booked Taxi — Fastest, Most Predictable
The taxi collects from inside your Heathrow terminal with a name board and drops you at your Gatwick terminal entrance — door to door, no connections, no platforms, no timetable. A standard saloon costs £69 to £95 as a confirmed fixed fare. That price covers the Gatwick drop-off charge, all M25 tolls, and any traffic delay. An MPV for up to 6 passengers runs £85 to £120.
The route follows the M25 clockwise to Junction 7, then M23 south. Off-peak, the journey takes 45 to 60 minutes. The bottleneck section is the M25 between Junctions 10 and 7 — it merges traffic from the A3 (Guildford), M23 (Crawley/Brighton), and A217 (Reigate), creating congestion that can add 20 to 40 minutes during weekday peaks. Our drivers know this stretch well enough to divert via the A217 through Reigate when live traffic shows the M25 backing up past Junction 9 — a shortcut that saves 10 to 15 minutes when it matters most.
The driver monitors your inbound flight from the moment it departs. If your transatlantic flight lands 90 minutes late at Terminal 5, the pickup adjusts automatically — same fare, no penalty, no phone call needed. When you clear customs, the driver is already in the arrivals hall. Luggage goes from your trolley to the boot without you touching it again until the boot opens at Gatwick. Sixty minutes of free waiting is included for international arrivals, measured from actual wheels-down, not the scheduled landing time.
The per-head maths for groups are straightforward. A taxi at £69 total for 3 passengers is £23 each — cheaper than three individual National Express tickets at £20 to £30 each, and considerably cheaper than three Elizabeth Line plus Thameslink tickets at £26 to £32 each. For a family of 4 with holiday luggage, there is no rail alternative that does not involve dragging suitcases up and down escalators through at least two London stations.
The service runs at the same fixed fare around the clock. A 3am pickup for a 6am Gatwick departure costs exactly the same as a midday transfer. No night premium, no early morning surcharge, no bank holiday uplift, no surge pricing. The fare confirmed at booking is the fare you pay at the destination — that is a guarantee, not a marketing line.
National Express Coach — Best Budget Option for Solo Travellers
The National Express coach is the cheapest way to make this journey alone. Coaches depart from Heathrow Central Bus Station every 15 to 30 minutes, stopping at all four Heathrow terminals and both Gatwick terminals. The journey takes 75 to 90 minutes off-peak. Advance online fares start at approximately £20; walk-up fares on the day can be £5 to £10 higher.
Heathrow Central Bus Station is underground, situated in the tunnel between Terminals 2/3 and Terminal 5. From T2 and T3 the walk takes 5 to 8 minutes through connecting corridors. From Terminal 4, take the free Heathrow terminal shuttle bus (allow 10 to 15 minutes). From Terminal 5, either walk through the T5 underground passage or take the shuttle. This terminal-to-bus-station transit time is often left out of published journey estimates but adds a genuine 10 to 20 minutes before you even board the coach.
The honest limitation is that the M25 sets your arrival time, not the timetable. The published 75-minute schedule holds on a clear Sunday morning. During Friday afternoon traffic or school holiday congestion, the same journey can stretch to 100 or even 120 minutes. Passengers with a connecting Gatwick flight and less than 3.5 hours between Heathrow landing and Gatwick gate should treat the coach as a fallback, not a plan.
Where the coach genuinely excels: solo passengers with one suitcase, flexible timing, and no tight connection. The coaches are modern and comfortable with on-board Wi-Fi, USB charging, and luggage storage underneath. Book online in advance for the best fare — the difference between a £20 advance ticket and a £30 walk-up ticket is real money for a budget-conscious traveller.
Train — Two Routes, Neither Direct
There is no direct rail service connecting the two airports. This surprises many passengers — particularly international visitors who assume two major international airports in the same city would have a dedicated rail link. They do not. Every rail journey requires at least one change through central London, and there are no current plans to build a direct connection.
Route A — Elizabeth Line + Thameslink (Recommended)
Take the Elizabeth Line from any Heathrow terminal to Farringdon station (approximately 40 minutes). At Farringdon, cross the platform to Thameslink southbound — the signage is clear and the change does not require leaving the station or using stairs. Take Thameslink direct to Gatwick Airport station (approximately 40 minutes). Total: 85 to 100 minutes, £26 to £32 per person.
This is the better rail option because the Farringdon change is cross-platform (no stairs with luggage), the Elizabeth Line carriages are modern and spacious, and Thameslink runs direct to Gatwick every 15 minutes during the day. The downside: during commuter hours the Elizabeth Line can be standing-room only, and there is no dedicated luggage space on either service.
Route B — Heathrow Express + Underground + Gatwick Express
Heathrow Express to Paddington (15 minutes, £22 to £37 single), Underground Circle or District Line to Victoria (20 to 25 minutes, approximately £2.80 contactless), Gatwick Express to Gatwick Airport (30 minutes, £19 to £22 single). Total: 90 to 110 minutes, £40 to £55 per person.
Faster on paper but substantially more expensive and physically demanding. The Paddington-to-Victoria leg involves carrying luggage down stairs at Paddington (Circle Line platforms lack step-free access from the main concourse without a long detour), standing on a crowded tube, and navigating Victoria station — one of London's busiest and most disorienting rail hubs. For passengers with heavy suitcases, this route creates more stress than the journey warrants.
For a group of 4, the cost comparison is decisive. Four Elizabeth Line plus Thameslink tickets: £104 to £128. Four Express route tickets: £160 to £220. One pre-booked taxi: £69 to £95 total. The taxi costs less for the group AND eliminates every platform, staircase, and connection from the journey.
Self-Drive via M25 and M23
Leave Heathrow onto the M25 at Junction 14 heading clockwise. Follow the M25 for approximately 30 miles to Junction 7, take the M23 southbound, exit at Junction 9 for Gatwick. In clear conditions the drive takes 45 to 60 minutes — roughly the same as the taxi, because it is the same road.
The variable is the M25 between Junctions 10 and 7, which is one of Britain's most congested motorway sections. Weekday peaks, roadworks (which are frequent on this stretch), and incidents can push the journey to 75 to 120 minutes. Friday afternoons between 3pm and 7pm are particularly unpredictable. If you do not know the M25, you cannot easily judge whether to stay on it or divert — and the wrong diversion can add time rather than save it.
Self-driving is practical only if you already have a rental car or your own vehicle and genuinely need the flexibility of independent routing. For connecting flight passengers — particularly those who have just stepped off a long-haul flight — driving a left-hand-drive rental car on an unfamiliar motorway under time pressure is a risk that a £69 pre-booked taxi eliminates entirely.
Connecting Flights — How Much Time You Actually Need
This is the question that drives most searches for this journey. The minimum safe connection time is 3 hours from Heathrow wheels-down to Gatwick gate using a pre-booked taxi, or 4 hours using coach or train. That assumes everything goes reasonably to plan — which, on the M25, is an assumption you should budget generously around.
| Stage | Best Case | Worst Case |
|---|---|---|
| Aircraft taxiing + disembarkation | 10 min | 20 min |
| Immigration / passport control | 10 min (UK/EU eGate) | 45 min (non-EU peak) |
| Baggage collection | 15 min | 35 min |
| Walk to taxi / coach / train | 5 min (taxi) | 20 min (bus station) |
| The transfer itself | 45 min (taxi off-peak) | 120 min (coach in traffic) |
| Gatwick check-in (if required) | 10 min | 25 min |
| Gatwick security | 10 min | 30 min |
| Walk to gate | 5 min | 15 min |
| TOTAL | 110 min (under 2 hrs) | 310 min (over 5 hrs) |
One important detail that catches passengers out: most connections between Heathrow and Gatwick are not protected by a single ticket. Each flight is an independent booking. If you miss your Gatwick departure because the transfer took longer than expected, neither airline covers the rebooking cost. This makes the transport method selection genuinely consequential — the difference between a 45-minute taxi and a 120-minute coach in traffic can be the difference between catching and missing a £400 flight.
Our recommendation for connecting flights: book the taxi before your Heathrow flight departs. The driver begins monitoring your inbound flight immediately. If your plane is delayed, the pickup adjusts. If customs takes longer than expected, the driver waits — 60 minutes of free waiting is included. This is the only transport method where a delay at one end does not cascade into a crisis at the other.
Gatwick to Heathrow — Same Options in Reverse
The journey works identically in the opposite direction. The taxi takes the M23 northbound to Junction 7, then M25 anticlockwise to Heathrow — same distance, same £69 to £95 fare, same 45 to 60 minutes off-peak. The National Express departs from Gatwick South Terminal at the same frequency and cost. The train runs Thameslink northbound to Farringdon, then Elizabeth Line westbound to Heathrow — same one change, same 85 to 100 minutes.
The one difference: overnight timing. If your Gatwick flight arrives after midnight and you need Heathrow for an early morning departure, the taxi is the only option. No coach or train service operates between the airports between approximately midnight and 5am. The pre-booked taxi runs 24 hours at the same fixed fare with no night surcharge.
Which Option Suits Your Situation?
flight Tight connection (under 3.5 hrs)
Taxi. Confirmed departure, flight monitoring, terminal-to-terminal. The only option where a delay does not become your problem.
savings Solo, budget, flexible
National Express coach at £20 to £25 online. Allow 2 hours total. Best when you have 4+ hours between connections.
family_restroom Family with luggage
Taxi. Two suitcases, a pushchair, and tired children through Elizabeth Line carriages and Farringdon stairs is an experience most families do once.
dark_mode Overnight transfer
Taxi only. No coach or train between midnight and 5am. Same fare as daytime, no surcharge.
train Time-rich, enjoy the journey
Elizabeth Line + Thameslink. Comfortable, scenic, avoids the M25. One easy change at Farringdon. £26 to £32 per person.
business_center Business traveller
Executive taxi at £120 to £150 in a Mercedes E-Class. Quiet cabin, Wi-Fi, phone charging. Use the M25 journey to prepare for your meeting.
Book Your Transfer — Fixed Fare from £69
Confirmed in 60 seconds. Flight monitoring, meet and greet, all airport charges and M25 tolls included. The price at booking is the price you pay.
Frequently Asked Questions
How much is a taxi between the two airports?
A pre-booked saloon costs £69 to £95 fixed for the entire vehicle. An MPV for up to 6 passengers costs £85 to £120. The fare includes the Gatwick drop-off charge, M25 tolls, flight monitoring, arrivals meet and greet, and 60 minutes free waiting for international flights.
Is there a direct train?
No. Every rail route requires at least one change through central London. The best option is Elizabeth Line to Farringdon then Thameslink to Gatwick — one change, 85 to 100 minutes, £26 to £32 per person. There are no plans for a direct rail link.
What is the cheapest way for one person?
National Express coach at £20 to £30 booked online. Takes 75 to 90 minutes off-peak, up to 2 hours during M25 congestion. Walk-up fares on the day are £5 to £10 higher than advance booking prices.
What if my inbound flight is delayed?
With a pre-booked taxi, the driver monitors your flight and adjusts the pickup automatically — same fare, no penalty, no phone call. With the coach or train, you miss your service and wait for the next departure.
Does the taxi fare change in traffic?
No. The fare is fixed at booking and does not change regardless of traffic conditions, route diversions, or time of day. A 90-minute crawl through M25 roadworks costs the same as a 45-minute clear run.
Which is cheaper for a group of 4?
Taxi at £69 to £95 total. Compare: 4 coach tickets = £80 to £120, 4 train tickets = £104 to £128, 4 Express tickets = £160 to £220. The taxi is cheapest for groups AND avoids carrying luggage through stations.
