In the mission planner, you can get a quick overview of the mission's expected profitability using the icon highlighted below. A green upward arrow means that the mission is expected to be profitable based on the order and mission details, while a red downward arrow means that the mission is expected to incur a loss.

A more detailed view of the profitability information can be seen in the view for the specific mission. See the article about the mission price card here. You can also export your data via the mission list.