Heathrow Terminal 3 to Terminal 4 Transfer Time

Last updated: May 18, 2026

Check Heathrow Terminal 3 to Terminal 4 transfer time, what the terminal move usually includes and how much extra buffer self-transfers usually need.

Last updated: May 18, 2026.

Quick answer

For the terminal move alone, Heathrow Terminal 3 to Terminal 4 transfer time is usually around 20 to 35 minutes. That is only the terminal movement piece. A safe full connection can need much more time once security, baggage or separate tickets are involved.

Terminal 3 to Terminal 4 planning table

Trip shape	Usually safer read	Why
Protected connection, carry-on only	20 to 35 minutes for the terminal move itself	The rail or bus part may be quick, but you still need to respect Heathrow’s connection process.
Protected connection with stress-sensitive timing	More than 20 to 35 minutes	A short terminal move can still feel tight once queues, walking and wayfinding are added.
Separate tickets, no checked bag	Much more than the terminal move alone	This starts to behave like a self-transfer, not a simple inter-terminal connection.
Separate tickets with checked bag	Large buffer needed	Immigration, baggage reclaim, terminal movement, check-in and security all stack up.

What changes the answer

• whether you are on one protected booking or on separate tickets
• whether the bags stay checked through or need reclaiming
• whether you still need to clear or re-clear security as part of the connection
• whether you are protecting a safe booking buffer or only the train or bus ride between terminals

Worked examples

Example 1: A protected same-day connection can sometimes absorb a 20 to 35 minute terminal move because the connection remains inside the airport system rather than becoming a fresh landside departure.

Example 2: A separate-ticket itinerary that lands at Terminal 3 and departs from Terminal 4 may look simple on paper, but it can fail quickly once baggage, check-in cutoffs and security are added back into the real journey.

Methodology

TripBuffer separates the terminal movement time from the full connection time. This page is about the specific Terminal 3 to Terminal 4 transfer, but it treats the terminal hop as only one part of the full connection risk.

Official sources

• Heathrow connecting flights
• Heathrow connection FAQs

FAQs

How long does Heathrow Terminal 3 to Terminal 4 transfer take?

The terminal move alone is usually around 20 to 35 minutes, but the safe full connection can need much more time depending on security, bags and ticket protection.

Is Terminal 3 to Terminal 4 easy at Heathrow?

It is manageable, but it is not just a simple walking move. You need to account for the full airport process around the terminal transfer.

Can I rely on 30 minutes between Terminal 3 and Terminal 4?

Not as a full connection buffer. Thirty minutes might describe the movement segment, but it does not protect the wider transfer process.

Do separate tickets change the answer?

Yes. Separate tickets can turn a manageable terminal move into a much riskier self-transfer because missed-connection protection usually falls away.