If you're not going through border control (Direct Airside Transit visa)
You might need a Direct Airside Transit visa if you:
will be changing flights in the UK on your way to another country
will not go through UK border control
Check if you need a visa
You may not have to apply for a visa. What you need to do depends on your nationality and whether you need to enter the UK. Check if you need to apply for a visa.
You do not need one if you have a valid:
Home Office travel document, for example you’re a refugee or stateless person
You must apply for another type of visitor visa if you’re travelling to or from Ireland, the Channel Islands or the Isle of Man.
How to apply
Check how to apply.
How much it costs
A Direct Airside Transit visa usually costs £35. This may change slightly depending on which country you’re in.