After arriving at T6, walk towards the TSA checkpoint but don't exit the secured area. Find the stairs or escalator going down to T5 tunnel. There will be signs that says "to Terminal 5".

Walk to T5 via tunnel and then to T4 via another tunnel. There should be golf carts there to assist passengers with limited mobility at both T5 and T4 tunnels.

After arriving at T4, turn around and find the stairs and go up to departure level and turn right. Walk towards TSA checkpoint but don't exit. Veer left after passing gate 41 and you will find the escalator going up to TBIT. There will be signs that says "to TBIT" and "to gate 1xx".

Take the escalator and then follow the walkway to TBIT lounge level.

Take escalator or elevator down to the departure level.

This walk will take about 20 minutes at normal pace.