This is the most expensive time to visit. You should start monitoring flights in January and aim to book by February or March (roughly 4–6 months out). Waiting until May can result in price hikes of $200–$400 per ticket.
To secure optimal pricing, aim for these specific booking windows based on when you plan to fly: best time of year to buy airline tickets to europe
For trips around Christmas and New Year's, aim to book by Halloween (late October) at the latest. Cheapest Months and Days to Fly This is the most expensive time to visit
For travel in May or September, the ideal booking window is 3 to 5 months in advance. best time of year to buy airline tickets to europe