Heathrow Minimum Connection Time: How Long You Really Need
Heathrow does not publish one single minimum connection time. It depends on your airline, whether you stay in the same terminal or change terminals, and whether your connection is domestic-to-international, international-to-domestic, or purely international. If you booked one ticket, your airline will quote its own minimum connection time when you book, and as long as your first flight lands on schedule you should make it. If you booked two separate tickets, none of that applies, and you need to build in your own generous buffer.
Why there is no single Heathrow number
Heathrow's own guidance is direct on this point: connection time "depends on your route, airline and whether you need to pick up baggage or change terminals, so there's no single answer." That is different from airports that publish one blanket minimum connection time for the whole site. At Heathrow, the number that matters is the one your airline (or the alliance handling your itinerary) sets for your specific routing, not a general airport figure.
What actually determines your connection time
Same terminal or different terminal. Heathrow has four main terminal buildings. Staying within the same terminal is usually a walk or a short ride on the free internal tram. Moving between terminals means a free shuttle bus, which runs roughly every 10 minutes, adding transfer time on top of security and any immigration steps.
International to domestic. If you are connecting from an international flight onto a domestic UK or Republic of Ireland flight, you will have a biometric facial image taken as part of the process, on top of the standard security screening that all connecting passengers go through.
Whether your bags need to be collected. Most passengers on a single-ticket itinerary will not need to collect checked baggage; the airline transfers it directly onto your next flight. If you are not sure whether that applies to you, check with your airline before you land.
One ticket vs two separate tickets. This is the single biggest factor. If you booked one ticket (even across two airlines in the same alliance or codeshare), your airline's minimum connection time applies, and if your inbound flight is delayed, the airline is generally responsible for rebooking you. If you booked two entirely separate tickets, none of that protection applies. You will need to clear immigration and baggage reclaim, then check in and clear security again for your next flight as if starting a new journey, and a missed connection is your own risk to manage.
Self-connecting: the exception to watch for
If you have booked two separate tickets and are relying on making your own connection, Heathrow is explicit that its normal connecting-passenger guidance does not apply to you. You are treated as an arriving and then a departing passenger, in full: security, baggage collection, and re-checking in, all over again. Build in a much longer buffer than you would for a single-ticket itinerary, and never assume airline minimum connection times protect you if you self-connect.
What to do if your inbound flight is delayed
As soon as you land, speak to an airline representative or a member of Heathrow staff. They can tell you the fastest way to your gate if there is still a chance of making your connection. If the delay means you have missed your onward flight, go to your airline's desk on arrival, since the representative there will rebook you onto the next available flight, and you may also be able to rebook through the airline's app or website. This only applies if you booked as one itinerary; if you self-connected on two separate tickets, rebooking your second flight is between you and that airline (or your travel insurer), not something Heathrow or your first airline is obliged to sort out.
Practical minimum connection guidance
| Situation | What to expect |
|---|---|
| Single ticket, same terminal | Walk or free tram; airline's quoted minimum connection time applies |
| Single ticket, different terminal | Free shuttle bus (about every 10 minutes) added to security and any biometric checks |
| International to domestic/Ireland | Extra biometric facial check on top of standard security |
| Two separate tickets (self-connecting) | Full arrival and departure process: baggage reclaim, immigration, re-check-in, security. Airline minimum connection times do not apply |
| Any connection, tight on time | Speak to airline staff immediately on arrival, do not wait to work it out yourself |
Practical tips
- Always check your minimum connection time with your airline when you book, not after, especially on a multi-airline itinerary
- If in doubt about whether your bags transfer automatically, ask your airline before you land rather than guessing
- Never assume a short scheduled gap will work if you are self-connecting on two separate tickets. Build in several extra hours, particularly for international to international journeys through Heathrow
- Keep your boarding pass details to hand. Most airlines issue all your boarding passes at initial check-in, but if you are missing one, you can still clear security with your itinerary and collect it at your airline desk or a self-service machine
Frequently asked questions
Does Heathrow have an official minimum connection time?
No single figure applies airport-wide. Your minimum connection time is set by your airline for your specific route, terminal combination, and ticket type, not by Heathrow as a blanket rule.
Is 90 minutes enough to connect at Heathrow?
It depends entirely on your specific itinerary. A same-terminal, single-ticket connection can be comfortable in that window; a different-terminal connection, an international-to-domestic biometric check, or any self-connection on separate tickets can make 90 minutes tight or insufficient. Check your airline's quoted minimum connection time for your exact routing.
What happens if my connection time is shorter than the airline's minimum?
Airlines generally will not sell you a single-ticket itinerary with a connection shorter than their published minimum. If your inbound flight is delayed and you fall below it, speak to airline staff on arrival, as they are responsible for rebooking you.
Do I need to collect my baggage when connecting at Heathrow?
Usually not, if you booked a single ticket; your airline transfers checked bags directly. If you booked two separate tickets, you almost always need to collect your bags and check them back in yourself.
Does connecting at Heathrow always mean going through security again?
Yes. All connecting passengers go through security again at Heathrow, regardless of terminal or ticket type, since every passenger departing a UK airport must clear UK security checks.
Is self-connecting at Heathrow risky?
It carries more risk than a single-ticket connection, since you have no airline protection if your first flight is delayed and you miss your second one. If you self-connect, build in a substantial buffer and consider separate travel insurance that covers missed connections.
Checked 2026.