When there are more Uber Eats orders in a certain area than couriers who are able to deliver them, the delivery fee may be higher than usual to ensure you can still get the food you want, when you want it.
Your app will let you know when there aren't enough couriers in a particular area. On the main feed, restaurants in these areas will display an arrow indicating the fee is higher than usual. The total fee will be displayed when you open the restaurant's menu.
Scheduled orders are subject to these fees based on the fee amount at the time of the order, not the delivery time.