If anyone is searching for an affordable flight, Kansas City has some decent prices and flight times. Southwest is also having a 50% off airfare sale through 06/17/2021 (promo code: SAVE50). I was able to get a direct flight out of MCI (Kansas City) for around $270 round trip. I'd say my all in cost with tickets for 3 of us, hotel and flights was around $1K. Flight times out of MSP are not great after the game (9/19/2021). If you can stay till Monday, that opens things up significantly.
One final thing. I've found the best days to get the cheapest flights have been Tuesday/Wednesday. Flight prices swell by $70-$100 Friday/Saturday/Sunday per ticket and wain Tuesday/Wednesday. Could save you a few hundred dollars, so I figured I would throw that out there.