Each restaurant determines its own price for delivery, depending on order value and remoteness of the place of the delivery address.
When ordering from more than one restaurants, a delivery price is paid separately for each of them. In this case, it is possible that delivery times increase or orders arrive at different times.
You can see the time for which each property delivers on the top right corner of the page with its menu.
Instead of delivery, you can order Take Out and get your order on yourself straight from the restaurant on your way home or to the office. In this case, you do not pay delivery price, but the value of the ordered food.