While it's technically legal to travel domestically with this kind of money, it can arouse suspicion from law enforcement. And to reiterate, if law enforcement suspects your money is tied to illegal activity, they can seize it.
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So you can bring any amount of money to the airport. Flying with a large amount of cash on a flight is not illegal. Nevertheless, bringing cash to the airport increases the chance it will be seized for a civil asset forfeiture proceeding during a search and detention.
The point of the U.S. customs cash limit is to catch criminals and prevent money from being used to fund illegal activity like money laundering or drug trafficking. Unfortunately, travelers who are otherwise law-abiding citizens sometimes get caught illegally traveling with too much cash.
So how much cash can you fly with? You can fly with any amount of cash. No law prohibits you from bringing any amount of money on a flight. Likewise, TSA has no rules that limit how much money you can bring through security.
If you are carrying cash with a value of EUR 10,000 or more, you are required to hand in your written declaration to the customs office at which you are entering or leaving the territory of the European Union.
If you are stopped by a U.S. Customs and Border Protection officer and more than $10,000 are found on your person or in your belongings, and this money was not declared, you run the very real risk of CBP taking all of the money you were carrying and keeping it.
100K is certainly enough to travel the world for a year, depending on how you choose to do it. If you're looking for luxury, then 100K can go quite far.
Just know that anytime you travel internationally with money, you're required to declare any cash over $10,000. You'll have to fill out declaration Form FinCEN 105 and provide the exact amount of money on you. Having to declare more than $10,000 in cash might seem a bit odd.
A good X-ray scanner will always detect money. Airport scanners can detect even the smallest amount of metal and can detect paper. The scanners will always look after things that look different to the norm. In this case, if the currency is arranged in bundles, it will be more easily detected.
It all depends on where you're going and what you plan to do during your trip. As you can see from our travel costs table above, some European cities are cheaper or more expensive than others. As a general rule, though, it's a good idea to budget at least $100 a day for your vacation.
If managed carefully, a $5,000 budget is more than enough to eat and drink your way across the continent on a 10-day or two-week trip –or perhaps even longer.
Don't bother to load up on cash before your flight. You can simply visit an ATM once you arrive and withdraw euros—the currency of 20 European countries—or other local currencies.
There is no cash limit to bring into the UK money from abroad, however you do need to declare if you bring cash to the UK of £10,000 or more. When you arrive in the UK, follow the “goods to declare” or “red channel” signs, and tell a Border Force officer you want to declare cash.
But, if you're willing to plan in advance (we started planning all of these things about a year in advance to build up the points necessary and such) and willing to do your research and make an effort, it's very possible to spend 10 days in Europe for under $3,000, staying at great hotels and not skimping on expenses.