An itinerary number is a unique identifier, or exclusive code, which is allocated to a particular travel itinerary by a travel agency or airline. Its purpose is to monitor and verify travel details such as flight times and other travel information. An itinerary number must not be confused with the ticket number.

An itinerary number (often used interchangeably with a confirmation number or booking ID) is a unique alphanumeric code assigned to your specific travel reservation. While a "Flight Number" (e.g., UA123) identifies the specific aircraft flying a specific route, the itinerary number identifies your personal transaction. It is typically a 6-character code (like ABC123) known as a Record Locator or PNR (Passenger Name Record). This code is the "key" to your entire trip; you use it to check in online, manage your seat assignments, or make changes to your booking. If you booked through a third-party site like Expedia or Booking.com, you might have an "Itinerary Number" for the agency and a separate "Airline Confirmation Code" for the carrier. In 2026, it is vital to keep this number handy, as it is the primary way airline agents pull up your data if you encounter delays or need to rebook during a travel disruption.

An itinerary number for a flight is a unique identifier assigned to a specific flight booking or reservation. It is not the same as a ticket number or confirmation code, but it helps track the details of your flight itinerary, such as flight schedules, routes, and passenger information.

Here’s what you need to know about itinerary numbers:

1. Purpose:
   - Itinerary numbers are used by airlines, travel agencies, or booking platforms to organize and reference your flight details.
   - It helps travelers and service providers access booking information quickly.

2. Format:
   - The format of an itinerary number varies depending on the airline or booking system. It could be a combination of letters and numbers, typically 6 to 13 characters long.

3. Where to Find It:
   - You can find the itinerary number on your booking confirmation email or e-ticket receipt.
   - It may also be listed in your online booking account or mobile app.

4. Difference from Ticket Number:
   - A ticket number is a unique identifier for your actual flight ticket, while an itinerary number is for the booking or reservation.
   - Once you purchase a ticket, the ticket number is issued, but the itinerary number is assigned earlier during the booking process.

5. When to Use It:
   - You may need the itinerary number when checking in online, contacting customer service, or making changes to your booking.

If you’re unsure about your itinerary number, check your booking confirmation or contact your airline or travel agent for assistance.