You must declare cash of £10,000 or more to UK customs if you're carrying it between Great Britain (England, Scotland and Wales) and a country outside the UK.
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In most cases, the personal exemption is $800, but there are some exceptions to this rule, which are explained below. Depending on the countries you have visited, your personal exemption will be $200, $800, or $1,600.
International airports have duty-free shops that carry luxury goods—but watch out for potentially high markups on the products. In the U.S., you must fill out a U.S. Customs Form, often during your flight home, to declare any purchases made abroad.
All travelers must complete a CBP Declaration Form 6059B itemizing all purchased merchandise and agricultural products. Here are your options: Complete a paper form that may be obtained at the port of entry or on the flight or cruise.
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. In other words, TSA has no cash limit per person.