Select the desired direction of flight in the left panel of the calendar (or at the top of the calendar). Select the departure city and destination. The calendar will show the most favorable prices for the direction chosen by you during the year. The prices are indicated for round trip flight.
If you plan to travel in the near future, look at the price calendar for the next month. Select the date on which the airfare is the lowest.
You should not overpay. Travel sparingly.