Do I go through customs on a layover in the US?

Yes. All passengers entering the United States clear customs and immigration at their first point of entry even if their final destination is another country. You collect your bags, pass through customs, recheck your bags, and clear security again. Allow 90-120 minutes for US connections.

What if I booked my flights separately?

You are responsible for meeting the connection time yourself. Collect your bags from the first flight, exit to the public area, recheck your bags with the second airline, and clear security again. The first airline has no obligation to wait or rebook you if delayed. Allow 3-4 hours minimum.

Can I leave the airport during a long layover?

Only if you have the required visa or entry permission for that country. Leaving means clearing customs and immigration then re-clearing security to return. Factor in airport location and traffic. A 6-hour layover gives you about 2-3 hours outside the airport realistically.

Do I clear customs at my layover or my final destination in Europe?

If both airports are in the Schengen Area you clear immigration at your first Schengen entry point and customs at your final destination. If you are connecting from outside Schengen to within Schengen you clear everything at the first Schengen airport.

What happens if I miss my connection because of customs delays?

If both flights are on one ticket the airline will rebook you at no charge. If you booked separate tickets you are responsible for buying a new ticket. This is why protected connections on a single ticket are worth the slightly higher price.

Customs During Layovers: Do You Go Through Security Again?

Whether you clear customs during a layover depends on your itinerary structure. On international-to-domestic connections you always clear customs at your first entry point. On international-to-international connections within the same country you usually stay airside. On connections between countries you typically stay in the international transit area without clearing customs until your final destination.

Check if your layover requires you to change terminals or airlines. Look at your booking confirmation. If both flights are on one ticket with the same airline or partners, you likely have a protected connection that keeps you airside. If you booked separate tickets or are switching between unconnected airlines, you may need to exit and re-enter security even on international-to-international routes.
Know the entry rules for your layover country. Some countries require all arriving passengers to clear immigration regardless of onward travel. The United States, Canada, and Australia always require this. Most European and Asian hubs allow international transit passengers to remain airside. Check your layover country's transit requirements before you fly.
Understand what happens to your checked luggage. On a single ticket your bags are usually checked through to your final destination. You will not see them during the layover. On separate tickets or when entering certain countries (US, Canada) you must collect your bags, clear customs, and recheck them even if your final destination is international.
Locate the transit area or transfer desk when you land. Follow signs for Transfers, Transit, or Connecting Flights. Do not follow signs for Arrivals or Baggage Claim unless your itinerary requires you to clear customs. If you are unsure ask a gate agent before you deplane or look for a transfer desk immediately after exiting the jet bridge.
Re-clear security if required. Even when you stay airside you often pass through another security checkpoint to reach your departure gate. This is standard. Keep your boarding pass and ID accessible. Liquids and electronics follow the same rules as your departure airport.

Do I go through customs on a layover in the US?: Yes. All passengers entering the United States clear customs and immigration at their first point of entry even if their final destination is another country. You collect your bags, pass through customs, recheck your bags, and clear security again. Allow 90-120 minutes for US connections.
What if I booked my flights separately?: You are responsible for meeting the connection time yourself. Collect your bags from the first flight, exit to the public area, recheck your bags with the second airline, and clear security again. The first airline has no obligation to wait or rebook you if delayed. Allow 3-4 hours minimum.
Can I leave the airport during a long layover?: Only if you have the required visa or entry permission for that country. Leaving means clearing customs and immigration then re-clearing security to return. Factor in airport location and traffic. A 6-hour layover gives you about 2-3 hours outside the airport realistically.
Do I clear customs at my layover or my final destination in Europe?: If both airports are in the Schengen Area you clear immigration at your first Schengen entry point and customs at your final destination. If you are connecting from outside Schengen to within Schengen you clear everything at the first Schengen airport.
What happens if I miss my connection because of customs delays?: If both flights are on one ticket the airline will rebook you at no charge. If you booked separate tickets you are responsible for buying a new ticket. This is why protected connections on a single ticket are worth the slightly higher price.