Pack smart for November: Chicago departures from O'Hare International Airport (ORD) often require a warm coat, gloves, and layers for chilly mornings and potential snow, while arrivals at Miguel Hidalgo y Costilla Guadalajara International Airport (GDL) typically enjoy mild, sunny afternoons—bring light layers and sun protection. Expect quicker security processing at ORD in early November but plan extra transit time near Thanksgiving. For Day of the Dead travelers, pack comfortable walking shoes and modest clothing for cultural sites. Health and safety: bring any prescriptions, stay hydrated on the 4-hour flight, and verify vaccination or entry health requirements before flying. CTA: Prepare your November packing list and check live weather forecasts for O'Hare International Airport (ORD) and Miguel Hidalgo y Costilla Guadalajara International Airport (GDL) before departure.