Do you have to go through customs on a layover in London?
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.
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Customs and immigration are usually required at the connecting airport for international flights. You don't always have to for domestic flights. In most cases, passengers on layover flights must clear customs and immigration at the first point of entry.
Minimum connecting timesWe recommend that you allow the following times when connecting between terminals: Within Terminal 3: 60 minutes. Between Terminal 3 and Terminal 5: 90 minutes. Within Terminal 5 (UK domestic and international flights): 60 minutes.
When layover flights are booked with the same airline, your baggage will be automatically transferred through to your final destination. However, if the two flights are with different airlines, you may have to claim and re-check your baggage during your layover.
For domestic to domestic layovers, you normally won't have to go through security again during your layover. However, for all international layovers, you will normally have to go through security again, but this will depend on individual airport policy.
Customs and immigration are usually required at the connecting airport for international flights. You don't always have to for domestic flights. In most cases, passengers on layover flights must clear customs and immigration at the first point of entry.
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.
You might have to go through customs during a layover, especially if your layover is in the Schengen Area (which consists of most countries in the EU). For example, if your final destination is Paris, France, but you have a layover in Madrid, Spain, you will actually go through customs in Spain, not France.
On interline flights (where two airlines agree to handle passengers with multiple legs in their journey), your baggage will be transferred automatically. For international layovers in the US and Canada, you will have to collect and recheck your luggage independent of whether the flights are booked on the same airline.
What is a good connection time? 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.