Question : How long are most people's visits to Paris when they fly in from Minneapolis?
Answer : Of course you're not most people, but if you were, you'd stay roughly 11 days.
Question : Will you do what it takes to get the absolute cheapest flight?
Answer : The lowest-cost day to fly in December is Friday. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : How often are prices changing for this route?
Answer : Prices for MSP to ORY do change much more than most. However, the sooner you book, the better price you tend to get.