You can fly with any amount of cash. No law prohibits you from bringing any amount of money on a flight.
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What happens if you bring a large amount of cash to the airport for a domestic flight? A TSA screener might discover the cash at the airport's security checkpoint. Checked luggage goes through a similar screening process.
International travelers entering the United States must declare if they are carrying currency or monetary instruments in a combined amount over $10,000 on their Customs Declaration Form (CBP Form 6059B) and then file a FinCEN Form 105.
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.
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.
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.
Many travelers also recommend bringing a dummy wallet when you travel, which is an old wallet filled with expired or fake credit cards and some small bills. Money belts and neck wallets — those flat, cloth pouches that fit under your clothes — are the traditional ways to carry money safely while you're traveling.
You're required to file a form with U.S. Customs and Border Protection when entering or departing the United States with more than $10,000. Failure to report this could lead to legal penalties, including seizure of your money.
You might be surprised to learn that there is no limit on how much cash you can cross the border with. However, if you travel with more than $10,000 USD then you must declare it.
You can but by carrying a lot of cash you risk becoming a target. Prevention of money laundering and taking illegally gained funds abroad. Also to prevent legally gained funds abroad for the purpose of tax evasion. Normally you can bring under U.S. $10,000 that is a lot of cash.