Heathrow Transit Guide 2026: Visa, Transfers, Terminals & Tips

Heathrow Airport(LHR) is one of the world’s busiest airports, but transiting is usually smooth if you leave enough time between flights. Visa requirements depend on your nationality and route, and some travelers can transit without entering the UK. If you have a longer layover, you may also be able to leave the airport and visit London. In this guide, you’ll find the key things to know about Heathrow terminal transfers, transit times, and visa rules.

Heathrow Airport Transit: Terminals, Transfers & Rules

Heathrow has 4 active terminals

Heathrow currently runs four terminals: T2, T3, T4 and T5. T1 closed permanently in 2015, but plenty of old online guides still list it. Double-check your terminal with your airline before you fly.

• T2 (The Queen’s Terminal) is the Star Alliance hub. Lufthansa, United, Singapore Airlines, and most Star members operate here.
• T3 is long‑haul heavy. Virgin Atlantic, Emirates, Delta, plus oneworld carriers like American, Cathay Pacific, and Japan Airlines. Also from 29 March 2026, some British Airways flights (Denver, Bermuda, Phoenix, etc.) moved from T5 to T3. If you’re connecting on BA, confirm terminal again before departure.
• T4 focuses on SkyTeam, plus Gulf and Asian carriers. Qatar Airways, Malaysia Airlines, Oman Air, etc.
• T5 is the home base of British Airways and Iberia. Most BA domestic and short‑haul flights run from here.

Security & terminal changes

• Every connecting passenger must go through UK security again. No exceptions, regardless of where you arrived from.
• 2026 update: CT scanners are now in all terminals. You no longer need to remove liquids or electronics. Containers up to 2 litres are fine. But this only applies within Heathrow. If you bought duty‑free liquids over 2 litres at another airport, you may still need a Security Tamper‑Evident Bag. Enforcement varies by airline. Check before you travel.
• Free transfer options: shuttle buses, Piccadilly line, Elizabeth line, and Heathrow Express.
• Reference transfer times (from JAL): T3→T2: ~5 mins, T3→T4: ~10 mins, T3→T5: ~10 mins. For your exact route, use Heathrow’s online Terminal Transfer Guide. Punch in your arrival and departure terminals.

Do I Need a Transit Visa or ETA for Heathrow?

Heathrow transit visa query.

It depends on two things: your passport and whether you go through border control (landside) or stay inside the terminal (airside).

Step 1: Figure out where you stand

• One ticket or two? If you booked separate flights, you will need to collect bags and go through border control. That is landside transit.
• Overnight layover? Heathrow has no airside hotels. You will need to pass border control and stay landside.
• Switching airports? Heathrow to Gatwick or any other London airport means you go landside.
• Airside transit? Only works if your bags are checked through and you have a confirmed onward boarding pass. Follow purple signs and stay in the international zone.

Step 2: Match your passport

• You need an airside transit visa (DATV) if your passport is from certain nationalities not eligible for visa-free airside transit in the UK, including countries such as Afghanistan, China, India, Pakistan, Nigeria, Sri Lanka, and others, depending on current UK rules.
• You may be exempt if you hold a valid visa or residence permit from countries like the US, Canada, Australia, or New Zealand, as long as you remain airside (do not pass UK border control).
• If you go landside, for example collecting baggage, changing airports, or staying overnight, you will need a Visitor in Transit visa, which allows a short stay in the UK, typically up to 48 hours.
• Travellers from visa-exempt countries may instead need an Electronic Travel Authorisation (ETA) to transit landside. ETA is a low-cost entry permission (currently £10, subject to change) and is generally valid for two years or until your passport expires.

Step 3: Know the 2026 changes

Two major updates you need to know:

• No more TWOV. The Transit Without Visa scheme was quietly removed in February 2026. Passengers who used to transit visa-free (India, Nigeria, Philippines, etc.) now need a Standard Visitor visa, even for short layovers. Check before you book.
• ETA enforcement from 25 February 2026. Airlines must now verify ETA status before boarding. No ETA means no boarding.

Tips: stay airside (purple signs, no border control) and you don't need one right now. The Home Office exemption runs until at least autumn 2026. But go landside for any reason, like picking up bags or an overnight stop, and non visa nationals must have an ETA. Full enforcement kicked in on 25 February 2026. Airlines check before boarding. No ETA, no flight.

How to Transit at Heathrow Airport

Transit with a Single Booking

Land at Heathrow, then follow the purple "Flight Connections" signs to your next departure. Stay airside – no border control, no baggage claim.

One catch that catches people off guard: every connecting passenger at Heathrow goes through UK security again. No exceptions.

Transit with Separate Tickets (Self-Transfer)

If you booked two separate tickets, Heathrow treats you like a fresh arrival. You are on your own.

Here's what you will likely need to do: pass UK border control, collect your bags, move to the next terminal (if different), check in again with the next airline, then queue for security like any departing passenger.

My advice, not an official guarantee: budget at least 4–5 hours for self-transfer. Add more if you're changing terminals or flying at peak times. Heathrow won't protect you if your first flight runs late. Self-transfer without a serious buffer is a gamble.

Minimum Recommended Connection Times

Tip: Book a single ticket whenever possible. Self-transfer at Heathrow is usually more time-consuming and riskier, with extra steps like immigration, baggage reclaim, and re-checking. You may also need a visa or ETA and at least 4 hours of connection time.

Heathrow Airport Map & Terminal Layout

First, the layout. T2 and T3 are right next to each other. You can walk between them underground. Takes about 5 to 10 minutes. T4 is on the south side. T5 is on the west side. You can't walk from T2/T3 to T4 or T5. You'll need a bus or train.

• Single ticket (airside). Follow the purple Flight Connections signs. Free shuttle buses run every 6 to 10 minutes between all terminals.
• Self-transfer (landside). First, you go through border control. That means you need a UK visa or ETA. Then you can move between terminals for free.
• Walking. Only between T2 and T3. Underground walkway via Heathrow Central station. Step‑free, well signed, no waiting.
• T4 to T5 is a pain. They're far apart. Trains need a change at T2/T3. The free shuttle bus takes about 15 to 20 minutes. If you're self‑transferring between these two, give yourself at least 90 minutes. Some airlines say 105 minutes.

How much time should you actually budget?

Airlines publish minimum connection times such as British Airways 75 minutes for T5 to T5 which is already one of the tightest in the world. This is the absolute minimum not a target.

Heathrow Airport Baggage Allowance

Check-in Baggage Rules

For transit passengers, baggage rules depend mainly on whether your flights are on a single ticket or separate tickets.

• Single ticket (through check‑in): Your bags go straight to where you're heading. You won't see them at Heathrow. Just follow the purple "Flight Connections" signs and go through security again. Yep, everyone does that second security check. Annoying but no way around it.
• Separate tickets or self‑transfer: Now you're on your own. You have to go through UK border control, pick up your bags, then check them in again for your next flight.
• Carry‑on allowance: Depends on your airline. But here's good news: from 2026, you can bring liquids up to 2 litres through security. No more fishing out tiny 100ml bottles or plastic bags. If you go landside, you'll have to go through security again anyway, but the 2 litre rule still applies at Heathrow.
• Left luggage for long layovers. Every arrivals hall has a desk (Excess Baggage Company, 5am–11pm). Prices: 0–3h £10, 3–24h £15, 24–48h £27.50, then £12.50 per extra day. Max 32kg per bag. But you have to go landside, so you need a visa or ETA. Also don't show up after 11pm. They're closed. You'll be that person dragging a suitcase through the tube.

👀 One thing. Make sure you know your airline's baggage rules before you fly. Especially if you're jumping between carriers. And when you check in, just ask: "Are my bags going all the way?" Don't just assume. Seriously.

Heathrow Airport Transit: Short on time?

If you have less than 4 hours between landing and takeoff, don't even think about leaving the airport. Border control, baggage claim, security again, not enough time. Stay inside. There's plenty to do.

• Eat. T5 has Gordon Ramsay Plane Food Market with Lucky Cat, Fish & Chips, Street Pizza, and Street Burger. Mains about £18 to £25. T2 has Shan Shui for Chinese food. T3 has a Wetherspoon's pub. Leon is cheap and decent.
• Shop. No tax refund anymore, but Harrods souvenirs are worth grabbing. T5 has a Harry Potter shop with shorter queues than King's Cross.
• Lie down. T3 has a Rest Zone with sofas. T4 is the quietest terminal. T2 near gates B31 to B49 is a quiet corner. T5's G gate area has long padded benches with no armrests.
• Take a shower. Plaza Premium Lounges in T2, T4, and T5. Club Aspire in T3. Pay at the door, around £35 to £50.
• Kids. Free Stay & Play areas in every terminal airside. Open 6am to 9pm.

Heathrow Airport Transit: Best Ways to Travel to Central London

Heathrow to London

If you have 6 to 8 hours, you can make a quick trip into central London work. But know this: that time disappears fast.

• Heathrow Express is the fastest. 15 minutes non‑stop from Heathrow Central (T2/T3) to Paddington Station. A single fare is £25, or £37 return. If you book in advance online, you can get it as low as £10 one‑way. Trains run every 15 minutes from about 5:00 AM to midnight.
• Elizabeth Line is the sweet spot. 35 minutes to Paddington, around £13 single. You can also get off at Bond Street, Tottenham Court Road, Liverpool Street, or Canary Wharf. Less than half the price of Heathrow Express, only 20 minutes slower.
• Piccadilly Line is the cheapest option. It takes 50 to 60 minutes to central London and costs £5.50 to £6.70 with contactless or Oyster. It runs 24 hours on weekends (Friday and Saturday nights), but the trains are slower, older, and crowded during rush hour. A good choice if you're on a budget and have extra time.

If you go for Heathrow Express or Elizabeth Line, tap your contactless card or Oyster at the gates. You'll be charged automatically, no need to buy a separate ticket unless you want the advance discount for Heathrow Express. The inter‑terminal transfer within Heathrow is free on both services.