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. So you can bring any amount of money to the airport.

You can legally carry $50,000 (or any amount) on a plane, but the reporting requirements are very strict. For domestic flights within the U.S., there is no legal limit on the amount of cash you can carry, and you are not required to "declare" it to the TSA. However, if the TSA discovers a large sum of cash during security screening, they may notify law enforcement (such as the DEA or local police) to ensure the money isn't tied to criminal activity. For international flights, the law is even more rigid: if you are entering or leaving the U.S. with more than $10,000 in cash or "monetary instruments" (like traveler's checks), you must file FinCEN Form 105 with Customs and Border Protection. Failure to declare the $50,000 can result in the entire amount being seized and forfeited, and you could face civil or criminal penalties. In 2026, it is highly recommended to carry bank withdrawal slips or documentation proving the legitimate source of such a large sum of money.