Looking on the internet deeply has found these results:

welcome to london is the most popular phrase on the web.

welcome in london 1316,000 results on the web	welcome to london 1555,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Welcome to London Heathrow, Terminal 5. Welcome to London, Mr... Tronstad. By my troth, welcome to London. My dear girl, welcome to London. One of the things that they welcome about living in London is democracy and the right to have their say on vital issues. CANDIDATE ZAHIR. IT'S A PRIVILEGE TO WELCOME YOU TO LONDON. I would also like to welcome the agreement reached in London, but at the same time underline that the global economy needs global governance. Given the seriousness of the situation, we must firstly welcome London's decision, and that of the Indian Government, to suspend all military aid to the current Nepalese Government.	Welcome to London Heathrow, Terminal 5. By my troth, welcome to London. My dear girl, welcome to London. Welcome to London, Mr... Tronstad.

welcome in london

1316,000 results on the web

welcome to london

1555,000 results on the web

More popular!

Welcome to London Heathrow, Terminal 5.
Welcome to London, Mr... Tronstad.
By my troth, welcome to London.
My dear girl, welcome to London.
One of the things that they welcome about living in London is democracy and the right to have their say on vital issues.
CANDIDATE ZAHIR. IT'S A PRIVILEGE TO WELCOME YOU TO LONDON.
I would also like to welcome the agreement reached in London, but at the same time underline that the global economy needs global governance.
Given the seriousness of the situation, we must firstly welcome London's decision, and that of the Indian Government, to suspend all military aid to the current Nepalese Government.