AeroMexico has select roundtrip flights to Guanajuato, Mexico on sale for as low as $449.04. (Click on AeroMexico in the top line to see this sale.) That's the lowest price we could find for these routes by at least a buck. This price is valid on flights departing from Chicago, IL, (ORD) with arrival in Leon, Mexico, (BXJ) on February 11 with return on February 18. Book this travel deal by February 28 for travel through March 25. Click here to see more routes.