On this page (5 sections)
What the T5 satellites are
Heathrow Terminal 5B and 5C are the two airside satellite buildings that sit alongside the main Terminal 5 building. The three buildings together form one terminal, with check-in, security, immigration, and baggage all in the main building (T5A). T5B and T5C hold extra departure gates and a small food offer, and T5B has a British Airways lounge; T5C has none. No part of either satellite is reachable from outside the airport; the only way in is to clear security in T5A and ride the transit train. For the wider picture of how T5 fits alongside the other three operating terminals, see the Heathrow terminals overview.
T5B opened with the rest of Terminal 5 on 27 March 2008, adding 12 gates for short-haul and some long-haul departures when the main concourse alone could not absorb peak BA volumes. T5C opened on 1 June 2011 with another 12 gates, sized for long-haul wide-bodies including the Airbus A380 and Boeing 777. The two satellites add roughly half the gate capacity of the terminal as a whole and are the reason T5 can run around 35 million passengers a year on a single security and check-in operation.
Which flights use T5B and T5C
British Airways and Iberia are the only carriers at Terminal 5, and both can be allocated to any of the three buildings. T5C is mostly BA long-haul, with the wide-bodies (A380, A350, 777) on routes to North America, the Middle East, and Asia. T5B carries a mix: long-haul overflow from T5C and a regular block of short-haul narrow-body departures, including some routes to Dublin and a handful of European cities. Iberia's Madrid services and codeshares can also appear at a satellite when the gate plan calls for it. See airlines flying from Terminal 5 for the route picture.
The gate number on the boarding pass tells you which building you need:
| Gate prefix | Building | Typical use |
|---|---|---|
| A1 to A23 | Main T5A concourse | Short-haul and some long-haul |
| B32 to B48 | T5B satellite | Mixed short and long-haul |
| C52 to C66 | T5C satellite | Long-haul wide-body |
The gate is assigned per flight by aircraft type and operational demand. Allocations can change the day of travel; the live departure board and the boarding pass are the definite source.
Getting to the satellites from main Terminal 5
The Heathrow T5 Transit is the only way to reach T5B and T5C. It runs in dedicated tunnels under the airside concourse, at around 30 miles per hour, with three stations: one under T5A, one under T5B, and one under T5C. The trains are driverless, automated, and run 24 hours a day. Boarding is step-free, with platform doors aligned to the train doors at every station.
To board the train from T5A, follow the gate signs to the escalators and lifts that drop down to the transit station under the concourse. The signs are clear from anywhere in the departure lounge. For wheelchair users and passengers with reduced mobility, every station is step-free and the trains include open wheelchair-accessible spaces. See where the satellites sit on the Terminal 5 map, the Heathrow airport map for the four terminals together, and the broader picture in transferring between Heathrow terminals, which covers the inter-terminal coach and the free Elizabeth Line shuttle between Heathrow stations.
There is no pedestrian route from T5A to either satellite. The walkway shape used at Terminal 2 (where T2B is reached by an 800-metre underground tunnel on foot) does not exist at T5. If the transit train is suspended, Heathrow runs an airside bus link in its place; the system has multiple trains and the line splits, so a full suspension is uncommon.
Facilities at the satellites
Both satellites are smaller and quieter than the main building, and the offer is thinner than most passengers expect. T5B has the BA Galleries Club lounge (Club Europe, Club World, and Executive Club Silver and Gold passengers; refurbished in October 2023), a Wetherspoon Express pub and a Starbucks at the B gates. T5C has no lounge of its own and no sit-down restaurant; a single Starbucks at the C gates covers coffee and grab-and-go. Toilets and charging points sit between gate clusters at both satellites.
What is not at either satellite: check-in, security, immigration, baggage reclaim, customs, or a meeting point. All of those are in the main T5A building. The BA First lounges (Galleries First, the Concorde Room) are also in T5A, not at the satellites. Anyone wanting the full Terminal 5 retail and food choice should browse T5A before riding the train. See the Terminal 5 guide for the main-building shops, restaurants, and lounges.
Arriving at a satellite
An inbound aircraft can park at any of the three buildings. After deplaning at T5B or T5C, walk through the satellite to the transit station, ride the train back to T5A, and then join the standard arrivals route through immigration and on to baggage reclaim. There is no separate arrivals process at a satellite; all UK Border Force checks happen in the main building regardless of where the aircraft parked.
For connecting passengers staying airside on a single ticket with through-checked bags, the transit train segment is straightforward: ride to the next satellite or back to T5A and follow the gate signs. The Heathrow connecting passenger route stays airside and does not pass through immigration. For an onward flight at T2, T3, or T4 the route is back to T5A, then either the Elizabeth Line shuttle between Heathrow stations (free within the airport) or the free inter-terminal coach. The detail and the per-airline minimum connection times are on the Heathrow inter-terminal transfer page.
Add 10 to 15 minutes to the normal arrivals timing for a satellite landing, because of the walk to the train, the wait, and the journey back to T5A. The whole arrivals sequence (deplane, train, immigration, bag wait, customs, out) is usually 35 to 55 minutes from satellite arrivals, and 25 to 45 minutes from a T5A stand.