Last updated: August 21, 2026
Heathrow terminal transfer times are not just about the shuttle, train or walking route. The real question is which process applies to you — whether you stay airside on a protected connection, or have to go landside and start again as a self-transfer. That decision changes the time you need far more than the terminal move itself.
Reviewed and updated: 13 August 2026. These are editorial planning estimates, not airline minimum connection times — see the methodology below.
Quick answer: protected connection or self-transfer?
Short answer: your Heathrow terminal-transfer time depends on whether you stay inside Flight Connections or enter the public arrivals area. If your flights are on one ticket with bags checked through, you’re a protected connection: follow the purple Flight Connection signs and, if you change terminals, take the free airside connection bus (roughly every 10 minutes). If you’re on separate tickets, Heathrow treats you as arriving and departing again — you clear immigration, reclaim your baggage, travel landside between terminals, then check in and clear security once more. The terminal-movement estimates on this page are not safe total connection times.
| Your situation | Correct route | What it involves |
|---|---|---|
| Protected connection — one ticket, bags checked through | Airside Follow the purple Flight Connection signs; take the free connection bus (~every 10 min) if you change terminals. | A connections security re-screen. No immigration or baggage reclaim. |
| Self-transfer — separate tickets, or bags not through-checked | Landside Clear immigration where required, reclaim baggage, travel between terminals landside, then check in and clear security again. | Immigration, baggage reclaim, landside transfer, check-in/bag-drop deadlines, security, gate closing. |
| Not flying / visiting — moving between terminals only | Landside Use Heathrow’s official landside route: walk, free inter-terminal rail or the Tube. | Landside movement only. |
Swipe horizontally to see all columns.
If you’re on separate tickets or handling checked baggage, treat the whole journey as a self-transfer and read our Heathrow self-transfer guide and Minimum Connection Time Calculator before you trust a raw terminal-move time.
Terminal transfer time table (movement only)
The estimates below are for getting between terminals only. They cover walking, waiting and the transport segment — they exclude immigration, baggage reclaim, check-in, security and gate closing. They are not airline minimum connection times.
| Route | Protected connection (airside) | Self-transfer (landside) | Movement estimate |
|---|---|---|---|
| Same terminal | Within the building; follow Flight Connection signs to your gate. | Within the building. | 10–20 min |
| T2 ↔ T3 | Follow the Flight Connection signs; staff may route you by the airside bus. | Walk via the pedestrian subway/walkway (Central Terminal Area). | 10–20 min |
| T2/T3 ↔ T4 | Free airside connection bus. | Free inter-terminal rail (Elizabeth line or Piccadilly line). | 20–35 min |
| T2/T3 ↔ T5 | Free airside connection bus. | Free inter-terminal rail (Heathrow Express ~20 min, or Elizabeth line). | 20–40 min |
| T4 ↔ T5 | Free airside connection bus. | Landside rail normally needs a change via the Central Terminal Area. | 30–50 min |
Swipe horizontally to see all columns. Movement only — not a connection time.
How much time should you actually leave?
Heathrow is clear that there is no single terminal-to-terminal connection time: it depends on your airline, itinerary, baggage and terminals, so you confirm it with your airline. Split the time you need into these types — and never use a movement estimate as your connection time.
- Protected (one ticket) Use the minimum connection time your airline accepts, shown in your booking — not a universal number. For a same-ticket T3–T5 change, for example, airlines commonly apply around 90 minutes, but your itinerary is what counts.
- Self-transfer (separate tickets) Allow a much larger buffer for immigration, baggage reclaim, the landside transfer, check-in/bag-drop deadlines and security. British Airways currently recommends at least four hours for its separate-ticket Heathrow connections.
- Not included above None of the movement estimates include security queues, immigration, baggage or gate closing — add those on top.
For how much total layover to book, use the Heathrow layover guide and the Minimum Connection Time Calculator. This page is about how the terminal move works, not the whole connection.
Not sure your connection is long enough? The Layover Calculator gives a quick Safe / Tight / Risky read for your specific connection.
Route-by-route guidance by terminal
Terminal assignments change. Airlines move between terminals, so always check your airline, boarding pass and Heathrow’s terminal finder before you travel rather than relying on alliance labels.
- Terminal 2 (Central Terminal Area): T2 ↔ T3 is a short landside walk, or Flight Connection signage airside. T2 ↔ T4 or T5 is a free airside connection bus for protected passengers, or free inter-terminal rail landside.
- Terminal 3 (Central Terminal Area, beside T2): for a T3 ↔ T5 connection on one ticket, follow the purple Flight Connection signs and take the free airside connection bus — British Airways runs dedicated Flight Connections buses on this route. Heathrow Express (~20 min) and the Underground are landside alternatives for passengers who have entered public arrivals, such as many self-connectors — not the protected airside route.
- Terminal 4 (separate, to the south): reached by a free airside connection bus for protected passengers, or free inter-terminal rail landside. Allow movement time plus your security and process time on top.
- Terminal 5 (separate, BA’s main base): a connection within T5 is the simplest. T5 ↔ T3 uses the free airside connection bus for protected passengers; self-connectors go landside via Heathrow Express or rail and re-check-in.
From the driver’s seat: what I see people get wrong changing terminals at Heathrow
I’ve spent years arranging airport transfers in and out of Heathrow, so I should be straight about my angle here: the airside connection — staying behind security and following the Flight Connection signs — is your airline’s world, not mine, and the guidance above covers it properly. Where I see people caught out is the landside side: dropping off and picking up across all four terminals, and the separate-ticket transfers where someone has to physically move from one terminal to another. Here’s the honest version of that.
The terminals are further apart than people expect
From arranging pickups across all four, the thing travellers underestimate most is distance. Terminals 2 and 3 share Heathrow Central and are a covered walk apart — genuinely close. But Terminal 4 sits on its own to the south-east, and Terminal 5 is out to the west; each is a proper transfer of several minutes by road or transit, not a stroll across a concourse. “Same airport” does not mean “same building,” and planning as if it does is where tight connections start to unravel.
Separate tickets are where I see people caught out
The travellers who get stuck are almost always on two separate bookings — not one through-ticket. They land at one terminal and fly out of another, which means going landside: clear the border, collect checked bags, leave, get to the other terminal, check in again and pass security a second time. That is not a quick hop, and it’s why the airline minimums for separate-ticket connections are measured in hours, not minutes. If you booked the two legs yourself, treat the terminal change as its own mini-journey and give it real margin.
Check which terminal you’re actually flying from
The mistake I see most often has nothing to do with the transfer itself — it’s people planning for the wrong terminal. Airlines move between terminals, and a codeshare flight can depart from a different terminal than the one on the ticket you remember. Because the terminals are genuinely far apart, getting this wrong costs real time. Confirm your departure terminal the day before you travel, from the airline or the live airport boards, not from memory.
The free landside transfer people don’t realise exists
If you do have to move between terminals landside — on separate tickets, or because you’re meeting someone at a different terminal — you don’t need a taxi for it. Heathrow runs free inter-terminal transfers for passengers between all its terminals. It’s slower than staying airside, but it’s included, and it saves people paying for a short car hop they didn’t need to.
Don’t treat a terminal change as a quick hop
Whether you’re going airside or landside, the honest rule is the same: a terminal change at Heathrow is never instant. Landside, with bags, re-check and a second security screening, it can eat a couple of hours. For anything tight, follow your airline’s stated minimum connection time for your specific terminals and add margin on top — never book to the bone and hope the transfer is quick.
Methodology and official references
Heathrow publishes the permitted connection routes but does not provide a universal terminal-to-terminal completion time for every passenger. TripBuffer’s movement ranges combine the published route, scheduled service frequency and an editorial allowance for walking and waiting. They exclude immigration, baggage reclaim, check-in, security and gate-closing deadlines unless expressly stated, and they are not airline minimum connection times. Where a figure comes directly from an operator (for example Heathrow Express at about 20 minutes between T3 and T5, or the connection bus running roughly every 10 minutes), it is attributed to that operator; the buffer guidance for separate tickets follows British Airways’ current recommendation of at least four hours. Route processes were checked against the sources below on 13 August 2026. TripBuffer is independent and not affiliated with Heathrow or any airline; if you spot a changed route, please tell us via the contact page and we’ll re-check it.
- Heathrow connecting flights guide (airside Flight Connections, connection bus, no universal time)
- Heathrow travel between terminals (landside routes)
- Heathrow terminal finder
- British Airways Heathrow flight connections (T3–T5 buses; four-hour separate-ticket recommendation)
- TfL Elizabeth line guidance
Frequently asked questions
Do I follow the Flight Connections signs or go landside to change terminals?
It depends on your booking. If your flights are on one ticket with your bags checked through, you’re a protected connection: stay airside, follow the purple Flight Connection signs, and take the free connection bus (about every 10 minutes) if you change terminals. If you booked separate tickets, Heathrow treats you as arriving and departing again — you clear immigration and passport control, collect your bags, travel landside between terminals, then check in and clear security for the next flight.
Are Heathrow terminal transfers free?
Yes. The airside Flight Connections shuttle bus for through-ticket connections is free, and the landside inter-terminal rail options (Heathrow Express, the Elizabeth line and the Piccadilly line between Heathrow terminals) are free for terminal-to-terminal journeys — you may just need to collect a free inter-terminal transfer ticket from the station machines.
How does the Terminal 3 to Terminal 5 transfer work?
On one ticket, follow the purple Flight Connection signs and take the free airside connection bus between Terminal 3 and Terminal 5 — British Airways runs dedicated Flight Connections buses on this route. Heathrow Express (about 20 minutes) and the Underground are landside alternatives for passengers who have already entered public arrivals, such as many self-connecting travellers; they are not the same as staying inside the protected airside route, and separate-ticket passengers cannot use the airside bus.
Are Terminals 2 and 3 walkable at Heathrow?
Landside, yes — Terminals 2 and 3 sit together in the Central Terminal Area and are linked by a pedestrian subway/walkway, so travellers who are not connecting airside can walk between them. If you’re on a protected connection, don’t assume you can just walk landside: follow the Flight Connection signs, as staff may route you by the airside bus to keep you within security.
Do I go through security again after changing terminals at Heathrow?
Yes. Heathrow says all connecting passengers are re-screened at security. On a protected connection you stay airside and pass a connections security check. If you’re self-connecting on separate tickets, you’ll also clear immigration, reclaim your baggage and check in again before security — which is why it takes much longer.
How much time should I leave for a Heathrow terminal connection?
There’s no universal Heathrow connection time — it depends on your airline, itinerary, terminals and whether baggage is checked through. For a one-ticket itinerary, use the minimum connection time your airline accepts, shown in your booking; the terminal-move estimates on this page are only part of that. For separate tickets, allow a much larger buffer — British Airways currently recommends at least four hours for its separate-ticket Heathrow connections, to cover immigration, baggage reclaim, the landside transfer, check-in and security.
Reviewed by Muhammad Umar Khan
Founder and editor of TripBuffer. Reviewed against official airport, airline and transport-provider information. For our research standards, see the Editorial Policy.