Okay, this is the lot! Team Pro Auto Center at the corner of Southwestern Blvd and Taylor Rd, just outside of the railroad overpass. $10 to park and a loooong walk to the stadium (and back.) But when it's time to leave you will be outside of the "gridlock zone" around the stadium. Once you pull out on Southeastern you'll have a little stop-n-go traffic but you'll be on your way to the airport in no time.
Also stay off the expressways including the Thruway. Go east on Southwestern, turn left at the 5-corners intersection at Orchard Park Blvd, then take the right hand split to Union Rd. Take Union up to Genesee to the airport.