So 2 hours should be ok - unless you run into really long lines at the connection center. Also no passport control and no customs. A second option is: immigration / customs in T1, walk through the tunnel to T3, security at T3.
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For international layover flights booked on one airline, two hours is often recommended to make your connection. For international flights on different airlines, the connection time will need to be even greater as you may have to change terminals between the two flights.
We recommend that you allow the following minimum connection times: 1 hour for connections within the same Heathrow terminal. 1 hour 30 minutes for connections that require travel between terminals at Heathrow.
We recommend that you allow the following minimum connection times: 1 hour for connections within the same Heathrow terminal. 1 hour 30 minutes for connections that require travel between terminals at Heathrow.
90 min isn't enough time. For Heathrow, I would recommend a minimum of 2 hours and even that makes me nervous. As for which terminal you will go in and out of, I suggest plugging the flight number into Flight Aware. It gives you the most recent flights and where the arrived/depart.
If your itinerary was purchased as one ticket (as in: you have only one itinerary and one confirmation number), and the connection time was too short and you miss the second (or third) flight, you can rest easy, no matter what happens. The airline will simply put you onto the next available flight, free of charge.
For connecting domestic flights, you almost never have to exit and reenter security, though there are some exceptions at airports where the terminals aren't all connected. For domestic-to-international connection, it's still pretty rare that you have to exit and reenter security, even if you're changing terminals.
CONNECTING FLIGHTSIf your baggage is checked through to your final destination, that's where you clear customs. If you're collecting your baggage and checking in to your next flight yourself, you need to pass through customs at Heathrow.
In a passenger context, MCT is defined as the shortest time interval required in order to transfer a passenger and his luggage from one flight to a connecting flight, in a specific location or metropolitan area.
So that airline suggests that 90 minutes will work, but don't delay getting off the plane, thru immigration/passport control, then thru security, and on to the other terminal. Again, look for an airport official if you need help.
Yes, there might be exceptions, but most often than not the airline won't wait. What you can do is to try to avoid missing your connection. But if you do miss your connection, don't worry, the airline will book you on a new flight for free (if it's an airline-protected connecting flight).
Travel advisers say there's a lot to take into account when booking connecting flights, but a general rule of thumb is 60-90 minutes between domestic flights and at least two to three hours for international itineraries.
The recommended layover time for international flights is generally longer, as you will have to go through customs and immigration before boarding your next flight. In most cases, a 30-minute layover for domestic flights and an hour for international flights is considered a minimum, or short, layover.
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If your connection at LHR is all at the same terminal, you won't have to take the extra time to transfer between terminals. Even if you do have to switch terminals, 3 hours won't be a problem. Heathrow usually waits until the last possible moment, though, to display at what gate your plane will depart.