This London Heathrow International Airport connection / transfer thread has been established separately from the connections / transfers between Terminals 3 (AA etc.) and 5 (BA, IB) here.

Please post your T3 <-> T1, T4 (T2 is under construction) questions, experiences, observations, etc. in this thread. Thank you, American AAdvantage Forum Moderation Team

Link to LHR "Which terminal does my flight depart from / arrive?"

Local transport options:

One can walk between Terminals 1, 2*3 (only) and from either to a Heathrow Express and Heathrow Connect station, and Central Bus Station.

The Heathrow Express Shuttle train T1, 2* & 3 to T5 landside, no cost, requires transfer to other train for T4):



(Heathrow Express continues to Paddington Station - 15 minutes; Paddington Connection requires 26 minutes.)

London Undergrund ("The Tube", fees unless you have an Oyster Card) connects T1-T3 and T5.

The Central Bus Terminal (National Express to London and other areas) is shared T1-T3; T4 and T5 have National Express stops.

Heathrow Hoppa busses serve most hotels (only Sofitel at T5 and Hilton T4 are accessible directly - "Hilton T5" is actually a Hotel Hoppa bus to Colnbrook, not at T5 at all); there is a £4 (£7 return) cost incurred with these, cash upon boarding or with tickets from kiosks, hotel booking desk or Central Bus Terminal.

A ground transport to National Rail, etc. guide link can be found in the wikipost.

There are also black cab / London taxis, as well as "minicabs" that can be arranged in advance (official taxis have a preposterous minimum charge for airport transport), such as www.a2zcars.org

Note: to transfer to LGW / Gatwick, you can use National Express (to Victoria or to Gatwick), cabs or Underground: transfer at Earl's Court or Hammersmith to Victoria Station for the Gatwick Express.

*T2 is currently under construction and closed, but it shares stations for HEX etc. with T1 and T3 when open.