We need to finalize our itinerary.

Meaning

We must complete our travel schedule.

Examples

• John: Have you booked our flights yet?
• Alice: Not yet, we need to <b>finalize our itinerary</b> first.
• John: Okay, let's do that today.
• Alice: Agreed. We really need to <b>finalize our itinerary</b> before the prices go up.