Transfer from Terminal 3 to Terminal 5 at Heathrow Airport

I (Pakistani) have a possible travel itinerary from USA to Saudi Arabia via UK Heathrow airport. From the airline website it says that I need to move from Terminal 3 (arrival from USA) to Terminal 5 of Heathrow airport. Do I need to pass the border check/immigration? If so then do I need to have UK transit visa or some sort? I have residence permit visa (Iqama) for Saudi Arabia.

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Transfer from Terminal 3 to Terminal 5 at Heathrow Airport - Cheerful female manager checking time on wristwatch standing with bags near bus station

Transfer from Terminal 3 to Terminal 5 at Heathrow Airport - Silhouette of worker driving baggage carrier on paved airfield with airplane before flight

Transfer from Terminal 3 to Terminal 5 at Heathrow Airport - Through glass modern aircraft parked near airbridge in contemporary airport against picturesque dusk sky

How long does it take to transfer from Terminal 3 to Terminal 5 at Heathrow?

Connecting within London HeathrowFromToAverage journey time (incl. waiting time)Terminal 5Terminal 320 min16 minTerminal 5 A, B or C Gates20 min20 min2 more rows

Can you walk from T3 to T5 at Heathrow?

Please note that all flights at Heathrow are now operating from Terminals 2, 3 and 5 following the temporary relocation of airlines from Terminal 4. You can walk between Terminals 2 and 3 via the pedestrian underpass. The route is well signposted and can be followed on our interactive Heathrow map.

Do I have to go through security again for connecting flight at Heathrow?

Everyone who boards an aircraft at Heathrow has to be security screened to UK government standards. Even if you've already been through security checks at another airport, we're obliged to screen you again before you fly from Heathrow.

Is Heathrow Express free between terminals?

For transfers between the central area and terminals 4 and 5 you use the Heathrow express/Connect underground system. Travel on the these trains is free between terminals.

Travel between Heathrow(London) airport terminal 3 to terminal 5

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Images: Gustavo Fring, Gustavo Fring, Kelly L, ArtHouse Studio