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Flights out of London Heathrow do not contain departure gate information until about 45 minutes before the flight is ready to depart (presumably so you spend more money at the duty-free). Are there any public APIs or resources that will tell me which gate my flight departs from before the Heathrow departure screens do?

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I can found only information for the terminal flight departs from, but not for the gate. It's possible that even the airport staff don't know the gate sooner – Dirty-flow Aug 16 '12 at 15:00
up vote 14 down vote accepted

This is because flights are not assigned gates until the inbound flight has landed. In case the inbound flight is delayed, the gate that is nominally reserved for it, gets assigned to someone else. This is all about managing the (at times incredibly busy) traffic on the ground around the airport.

They could announce the nominally assigned gate, of course, but then they would frequently have to announce gate changes, with resultant confusion. It is simpler for the aiport to only announce gates once the assignment is very unlikely to change (i.e. the plane is already there).

So to answer your question; No, you can't do that.

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That's interesting - how do other major airports do it? At least at Chicago O'Hare I know the gate 2-3 hours before departure and I don't recall hearing of frequent gate changes. – Ansari Aug 16 '12 at 17:18
@Ansari haven't been much in Chicago, but in SFO and LAX I recall quite a lot of gate changes. – littleadv Aug 16 '12 at 17:20
@Ansari In all major airports there is a system (Gate manager) that distributes the gates depending on the airlines, destinations, size and other factors. This system is connected to the departures and landings systems. – Heidel Ber Gensis Aug 17 '12 at 3:02
@Ansari gates at ORD change at least 25% of the time, in my experience (although that might depend on the terminal). Sitting at the gates at LHR is generally a dismal experience anyway; often you can't get back out again and there is nothing in there apart from a few soda machines. Personally I'd rather be in the departure lounge. – Andrew Ferrier Sep 24 '12 at 11:45

I don't know about the other terminals, because I don't visit them often enough, but for Terminal 5 the gate is normally known to BA about 1.5 hours in advance of departure. I say normally, because if there's disruption (weather, inbound flight is late etc) things can change and it won't be confirmed. However, most cases (let's say at least 80%), BA will know at checkin time.

T5 is a little special, because it has 3 parts to it, T5A (directly attached landside), T5B and T5C (which has no lounges). At checkin, if you ask, they can almost always tell you which bit of T5 your flight will leave from, so you know which lounge to head for (assuming you have lounge access). They won't always tell you the exact gate then, however, if you ask when you check into the lounge they'll either tell you the gate, or tell you when they can tell you the gate. The lounge staff are normally able to tell you the gate number at least 30 minutes before it shows on the board. (They have to look it up in a different system though, it doesn't flash up when they scan your boarding card to let you in)

So, my advice is to ask about the gate at checkin, and see if they can look it up then. If not, clear security, then ask either the lounge staff (if you have access), or the airport information (if not). They ought to be able to look it up on the airport system and tell you.

For most parts of Heathrow, heading to the wrong bit of the terminal just means a 10-15 minute walk. For some bits, it can mean having to re-clear security and wait for a shuttle train, so it's worth double checking before you say head to T5C only to find your flight goes from T5A....

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Home airlines will always know gate information early because they have priority slots that are unlikely to change. For example British Airways at LHR, and therefore I presume american airlines in the US.

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Landing slots != departure gates. BA, who are based in Heathrow, can and do change planned gates until announced, in part due to late arrivals or last minute aircraft changes. – Gagravarr Aug 17 '14 at 11:56

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