“If you are trying to get the cheapest prices in airfare, flying in the early morning or late evening is best because this is when airlines tend to have the cheapest rates available.”
Anton also suggested avoiding national holidays if possible.
“While flying in the middle of the week and at night might be beneficial for most flyers, holidays and certain special events may have an effect on these unspoken rules,” he added.
“Flights tend to be more expensive and airports are even busier during holidays, regardless of the day of the week or the time of day, so it is important to plan and be prepared for these circumstances.
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source: express.co.uk