The main airport in the Twin Cities is MSP — Minneapolis/St. Paul International Airport. You can fly directly into MSP from nearly anywhere in the world. Our airport has ranked the #1 airport for the last two years and is full of great food and shopping options. You can take the light rail directly from the airport to downtown Minneapolis.
Google Flights is a good tool for searching airfare and setting up price tracking for flights.
If you are planning on driving, ask around in your local community to make a carpool to share costs. Some of the best Ingress memories are made during a road trip to an Anomaly! Consider renting a larger car for the weekend to fit more people. (Don’t forget to look for car rental discounts via credit unions, Costco, etc.)
Public transportation comes in the form of light rail and buses. You can search and find route maps with Metro Transit. Google maps also provides good public transportation information. There is a Metro Transit app for digital payments. The app also has a Plan a Trip function that is good for planning. You can pay for fares as you go, or you can purchase a multi-use Visitor Pass.