These airports let you clear U.S. customs before you fly home. Here’s what you can skip

Queen Beatrix International Airport in Aruba is one of several airports outside the U.S. where travelers can complete U.S. customs and immigration before boarding their flight home. (Thomas Roell via Getty Images)On a recent flight home from Aruba, I found myself in a Global Entry line before I had even left the island.

I'd been through U.S. preclearance before, when departing both Dublin and Montreal, so clearing U.S. immigration and customs outside the United States wasn't entirely new to me. But those flights had been nonstop to my final destination.

This time was different. I had a checked bag and just 90 minutes to make a connection after landing in the U.S. Then my flight from Aruba was delayed by half an hour.

I started doing the math. Would I have to clear immigration, wait for my suitcase, take it through customs, recheck it, go through TSA security again, and still make it to my connecting gate in Miami?

As it turned out, I didn't have to do any of that, since I'd already completed U.S. preclearance in Aruba.

When I landed in the United States, I could head to my connecting flight much as I would after a domestic flight. My checked bag continued on to my final destination, and I didn't have to go through another security checkpoint.

For anyone connecting after an international flight, that can remove some of the most stressful and unpredictable parts of the trip home and make the return to reality a little easier.

U.S. preclearance facilities let travelers complete customs and immigration before departure, so they can arrive in the U.S. more like domestic passengers.

U.S. Customs and Border Protection (CBP) operates preclearance facilities at select airports outside the United States. At these airports, travelers complete the U.S. entry process before boarding their flight instead of after landing.

That includes U.S. immigration, customs, and agriculture inspection. Passengers and their carry-on and checked baggage also undergo security screening abroad that meets requirements for precleared U.S.-bound flights.

Once that process is finished, your flight can arrive in the United States much like a domestic flight. You generally don't need to go through CBP or TSA screening again simply because you've entered the country, and you can continue to your final destination or connecting gate.

That last part is especially useful if you have a domestic connection.

Note that you still need the passport and travel documents required for your international trip; preclearance simply moves the U.S. entry process to your return departure airport.

If you've already completed preclearance before departure, your arrival in the U.S. is much more like a domestic one. In a typical connecting itinerary, that means:

No collecting and rechecking a through-checked bag just because you entered the U.S.

No additional TSA screening before your domestic connection

You can head toward your connecting gate instead

And unlike Global Entry, preclearance isn't a membership program. If your flight departs through a preclearance facility, you go through the process as part of your normal departure.

For connecting travelers, one major benefit of preclearance is avoiding the usual need to collect and recheck a through-checked bag at the first U.S. airport.

Normally, connecting after an international flight means clearing passport control, customs, collecting and rechecking checked luggage, and another security checkpoint before making your connection.

With preclearance, that process happens before departure, so a U.S. connection can feel much more like a domestic one. If your bag is tagged through, it can continue to your final destination, and you generally won't need to go through TSA screening again unless your itinerary or airport setup requires it.

That was the part I appreciated most in Aruba. With my delayed flight and short connection, skipping the usual international-arrival routine gave me considerably more breathing room.

There are currently 15 airport preclearance locations in six countries. If you're flying home from one of these airports, that preclearance step can make a short U.S. connection much less stressful:

Canada: Calgary, Edmonton, Halifax, Montreal, Ottawa, Toronto Pearson, Vancouver and Winnipeg

Caribbean: Aruba; Nassau, Bahamas; and Bermuda

Montreal is one of several Canadian airports with U.S. preclearance, allowing U.S.-bound travelers to complete the entry process before takeoff.

My previous experiences in Montreal and Dublin had been much simpler.

Both times, I completed U.S. preclearance before boarding and then flew directly to my final destination. When I landed in the United States, there was no immigration or customs line waiting for me.

It was convenient, but I hadn't given much thought to what preclearance would mean if I had another flight to catch – until Aruba.

Seeing a Global Entry line there wasn't especially surprising because I'd encountered U.S. preclearance before. What I hadn't considered was how many steps I'd already completed before boarding the plane, including the steps that can eat into a connection after a normal international arrival.

It was a good reminder that preclearance isn't simply moving the customs line to another country. For connecting passengers, it can change the entire arrival experience.

Preclearance won't extend your vacation, but it can make the trip home less painful. Just remember that the extra steps happen before departure, so allow enough time at the airport.

Preclearance can save time after you land, but those steps still happen before departure. Give yourself enough time for check-in, baggage drop, security, and preclearance, and if you're checking a bag, confirm that it's tagged to your final destination.

Separate tickets or unusual itineraries can complicate things, but on a typical connection, preclearance removes several of the most time-consuming parts of entering the U.S.

I'd already appreciated the convenience in Dublin and Montreal. It took a delayed flight, a checked suitcase, and a tight connection from Aruba for me to realize just how useful it can be.

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