Travelers should declare all items being brought from abroad that will remain in the United States. This includes gifts and duty-free purchases. Goods purchased in a duty-free shop are not automatically free of duty upon your return to the United States.
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What Do I Have to Declare at U.S. Customs?
Plants, seeds, food, fruit, vegetables, insects.
Meat, animals or animal products.
Disease agents, cell cultures, snails.
Soil, or if you have been on a farm, ranch, or pasture.
You may bring large sums of money with you in the form of cash, money order, or traveler's checks. There is no maximum limit, however, any amount exceeding $10,000 USD must be declared upon arrival on both the Form 6059B and FinCEN 105. All forms must be filled in completely and truthfully.
Most countries require travellers to complete a customs declaration form when bringing notified goods (alcoholic drinks, tobacco products, animals, fresh food, plant material, seeds, soils, meats, and animal products) across international borders.
There are signs that will indicate you have been flagged for additional screenings: You were not able to print a boarding pass from an airline ticketing kiosk or from the internet. You were denied or delayed boarding. A ticket agent “called someone” before handing you a boarding pass.
Double-check for prohibited itemsIn U.S. arrival areas, amnesty bins (or even garbage cans) are less common, however, which could potentially lead to more people being fined. A good rule of thumb is to search your bags one last time before deplaning to make sure you didn't, for example, stash an apple from the flight.
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.