To/from Waterloo Station 521 & 341. Also many other routes that stop at Holborn Station, you can get off here and walk down High Holborn to your right.
To/from Kings Cross Station 17/45/46
To/from Liverpool Street Station 8/242
To/from Farringdon Station 17/45/46/521

To/from the West End 8/25/242
To/from The City 8/17/25/242/521

TFL’s Holborn Circus and Chancery Lane bus map