To find the flight number, all you have to do is look for terms like “flight” on the ticket. Alternatively, you only need to know how a flight number is made up. It consists of capital letters at the beginning, followed by a four- to five-digit combination of numbers.

In 2026, a standard flight number follows a specific IATA format: a two-character airline designator followed by a numerical code of one to four digits (e.g., AA123 or DL4567). The letters identify the airline—such as "LH" for Lufthansa or "AF" for Air France—while the numbers are assigned based on specific route conventions. Generally, eastbound and northbound flights are assigned even numbers, while westbound and southbound flights receive odd numbers. Flights with lower numbers (1 through 99) are typically reserved for an airline’s prestigious "flagship" long-haul routes. Conversely, four-digit numbers starting with 3, 4, or 5 often denote regional partners or subsidiaries, and numbers above 6000 are usually "codeshare" flights, where one airline sells seats on a plane physically operated by another. Special mission, charter, or ferry flights may use 9000-series numbers. This alphanumeric string is essential for air traffic control, baggage tracking, and passenger orientation within the global aviation network.