From Heathrow Airport by Underground (Tube/Metro):
Take the Piccadilly Line (dark blue) to Russell Square Station. From the station turn left, cross Russell Square and turn left into Montague Street.

From Heathrow Airport by A2 Airbus
Take the A2 Airbus from Heathrow to the British Museum. From the Museum continue along Russell Street and turn left into Montague Street.

From Gatwick Airport:
Take the Gatwick Express train to Victoria Station. Change to the Underground system where you catch the northbound Victoria Line (light blue) to Green Park Station and change to the northbound Piccadilly Line (dark blue) to Russell Square. From the station turn left, cross Russell Square and turn left into Montague Street.

From Waterloo Station:
Take the northbound Northern Line (black) to Leicester Square and change to the northbound Piccadilly Line (dark blue) and continue to Russell Square Station. From the station turn left, cross Russell Square and turn left into Montague Street.

From Victoria Station:
Take the northbound Victoria Line (light blue) to Green Park and change to the northbound Piccadilly Line (dark blue) to Russell Square. From the station turn left, cross Russell Square and turn left into Montague Street.