Quick rules for flying with cash in carry-on and checked baggage. Verdicts and conditions across the major aviation regions below.
No limit on domestic flights. International: must declare amounts of $10,000 USD or equivalent (per family) when entering or leaving the US — failure to declare can result in seizure.
Must declare €10,000 or equivalent when entering or leaving the EU. No internal EU limit.
Most countries require declaration of USD $10,000 or equivalent on entry/exit (Mexico, Brazil, Colombia, Chile). Argentina has had currency controls limiting cash to USD $10,000. Undeclared amounts can be seized. Always declare on the customs form.