London Heathrow to Phoenix

Could be 20 minutes, could be two hours. Where are you heading to?

Assuming you arrive on time, it should take an hour to clear the airport, give or take 10 minutes. The big unknown is will you be on time?

What transport are you proposing? If a train, buy a flexible ticket. Always assume that it will take you more not less time.

I have never cleared a London airport in 40 minutes, much less 20 as the previous post suggests and I use London airports a lot!

Don't want to get into the "my air miles are bigger than your air miles" rubbish but I have seen it done, is all. Unlikely though , admittedly.

It is perfectly possible to be leaving LHR 20 minutes after landing (done it myself on occasions), but this will probably require not arriving at the remote parts of terminals - and unlikely without an EU passport, or being in the Registered Traveller Service.

There are no particular ongoing problems at the moment but I would allow a couple of hours to be on the safe side at least if booking non-refundable transport.

As is usual for me my question was confusing. I will be arriving in Phoenix from LHR ...I need to make reservations for my onward flight from there. I don't know how efficient Phoenix Sky Harbor is....

Thanks for all the replies. I will be traveling to LHR and intend to take the tube to Kings Cross and then northward by train with a flexible ticket...no biggy there. I have done this part before. It is the Phoenix end that is new to me.

Again thanks for answering my misleading question. I posted in the England forum because that is where I am coming from....I am sure there are other Arizona travelers!

We changed planes at Sky Harbor last October but they were domestic flights so we did not have to go through immigration. We did have to change terminals ( from T4to T2) which took some time.

You will be arriving at Terminal 4, which is the large and modern one. Many other airlines, including American and Southwest, use that terminal. Getting through immigration at any airport often depends on how many international flights are arriving at that time. If BA is the only one, it could be fairly fast (depending on what passport you hold).

But since you are booking your onward flight separately, you need to allow for delays in flight as well as at the airport. The usual recommendation for an "unprotected" connection (I.e. not on the same ticket) is 2-4 hours. I like to err on the side of caution and allow four.

Where are you flying next? Can you use Alaska Airlines? If so, they have a nice policy on "same day" flight changes---it only costs $25. We took advantage of this when we fly back from Australia---I booked a flight out that was four hours later. We arrived at LAX on time and got through immigration quickly, so we changed to an earlier flight. It works the other way too---if you miss your scheduled flight, they will put you on the next one, assuming there is room. But it has to be the same day.

Thank you, Lola. I will check into Alaska Air.

Where are you going to? PHX is a rather strange airport in that in has 3 independent terminals connected by a bus. They are building a tram to connect them but I'm not sure how far along that is.

Unless you are hitting spring break, hotels are cheap in Phoenix if you decide to spend the night. Many provide free shuttle and breakfast.

The Airtrain is working at Sky Harbor. We used it last October to go from T4 to "near" T2. Still had a bit of a walk but that was fine.

Ann - Phoenix Sky Harbor is my home airport. The best I have ever cleared immigration and customs on the BA LHR/PHX flight is 1 1/2 hours, so I say plan on 2 hours. As Lola mentioned you'll be coming into T4 which is the main terminal for American & Southwest airlines. If you are looking to travel farther American is a One World partner with BA.

Thanks, Everyone.

I appreciate everyone taking the time to answer my question.