Heathrow Terminal Transfer Times

Heathrow terminal transfer times are not just about the shuttle, train or walking route. The real question is how much airport process sits around that terminal move, especially if you are not on one protected ticket.

Last updated: April 25, 2026.

Quick answer

If you are transferring on separate tickets, terminal movement is only part of the problem. Use the Heathrow Self-Transfer Guide for the bigger baggage, check-in and missed-flight risk picture.

• Same-terminal Heathrow connections are the lowest-friction option.
• Terminals 2 and 3 are connected and usually the easiest inter-terminal move.
• Transfers involving Terminals 4 or 5 often look quick on paper but still need buffer for walking, waiting and security.
• If you are self-connecting, do not confuse terminal movement time with total connection time.

Heathrow terminal transfer planning table

Route type	How the transfer works	TripBuffer movement-time range	Planning note
Same terminal	Walk or, in some cases, free tram within the terminal area.	10 to 20 minutes	Simplest option. Many Heathrow connections happen within the same building.
Terminal 2 to Terminal 3 or Terminal 3 to Terminal 2	Connected by a short walk.	10 to 20 minutes	Often the easiest inter-terminal move, but still not something to plan too tightly.
Terminals 2 and 3 to Terminal 4	Free rail transfer via Heathrow’s inter-terminal network.	20 to 35 minutes	Movement is usually straightforward, but the walk to stations and waiting time matter.
Terminals 2 and 3 to Terminal 5	Free rail transfer via Heathrow Express or Elizabeth line.	20 to 35 minutes	Fast on paper, but allow more than the train ride alone.
Terminal 3 to Terminal 5 on British Airways routes	BA says dedicated Flight Connections buses are available, and Heathrow Express is around 20 minutes.	20 to 40 minutes for the terminal move alone	Use a larger full-connection buffer because the transfer time is only one part of the journey.
Any self-transfer across terminals	Arrival process first, then landside movement, check-in, bag drop and security.	60 to 120+ minutes before you even add departure timing	This is why separate-ticket Heathrow transfers need much larger total layover buffers.

What the official Heathrow process means in practice

• Heathrow says all connecting passengers go through security again.
• Heathrow says self-connecting passengers should use the separate travel-between-terminals guide because they are effectively arriving and departing again.
• TfL and Heathrow both publish free inter-terminal rail options, but you may still need to collect an inter-terminal ticket at the station.
• British Airways publishes extra route-specific guidance for Heathrow Terminal 3 and Terminal 5 connections, which is a useful signal that not all terminal changes feel equal in practice.

How to use these transfer times

Methodology and official references

TripBuffer’s ranges combine Heathrow’s published transfer methods with typical walking and waiting time. They are planning ranges for real travellers, not official minimum connection times.

• Heathrow travel between terminals
• Heathrow connecting flights guide
• British Airways Heathrow flight connections
• TfL Elizabeth line guidance

Frequently Asked Questions

Are Heathrow terminal transfers free?

Yes, Heathrow and TfL publish free inter-terminal transfer options. For rail transfers, you may need an inter-terminal transfer ticket from the station machines.

Are Terminals 2 and 3 walkable at Heathrow?

Yes. Heathrow and British Airways both describe Terminals 2 and 3 as connected and a short walk from each other, but you should still allow time for wayfinding and security queues.

How long does Terminal 3 to Terminal 5 take at Heathrow?

British Airways publishes Heathrow Express at around 20 minutes between Terminal 3 and Terminal 5, but your real connection takes longer once walking, waiting and security are included.

Do I need to go through security again after changing terminals at Heathrow?

For flight connections, Heathrow says all connecting passengers must go through security again. Self-connecting passengers may also need baggage reclaim, immigration and check-in before they reach security.