Student or Learner
"Tickets get very expensive during high seasons. Do you know when the high season ends? I would like to buy the cheapest ticket whose departure date is August 10Th or later. The return ticket could be for any date, as long as you get me the best price. It could even be an open-ticket, provided that the price is the lowest."
Please, it this text ok?
In the US, we say "prime season."