Due/duː/ Definition 1 of 5Pro Tip 1/3Future Expectations Use 'due' to express when something is expected to occur, especially officially planned events. Your flight is due to depart at 6 PM. Pro Tip 2/3Unplanned Events 'Due' suggests a sense of certainty or schedule, so don't use it for uncertain or unplanned occurrences. Incorrect: The sun is due to shine tomorrow. Pro Tip 3/3No Immediate Consequence 'Due to' implies that there's no immediate action required - it's just information. The next billing cycle is due to start on the 15th.