November to March are the cheapest months to fly to Michigan. Severe winter reduces the demand for airline tickets. The lower temperature limit sways from 35.8°F (2.1°C) in November to 20.7°F (-6.3°C) in February to 29.7°F (-1.2°C) in March. May to September is the peak time for visitors as the weather turns warmer. If you are planning to holiday in Michigan during this time, consider booking your plane ticket at least 3 to 4 weeks ahead of the flight departure.