Comcast Xfinity internet promotional prices. Xfinity plans and prices vary by region, but here's a quick recap of the Xfinity prices and internet speeds you'll find in the West: Connect: $19.99/month*, up to 50 Mbps download speeds, 1.2 TB data cap. Connect More: $39.99/month*, up to 100 Mbps download speeds, 1.2 TB data cap.. "/>