It’s optimal to fly from St. Louis to Cusco in the morning. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight at noon.
Flights from St. Louis to Cusco lean towards being more expensive in December. Prices are generally better when you fly from St. Louis to Cusco in March, with the cheapest ticket starting at $1,138.
Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 17% on the overall cost on flights from St. Louis to Cusco.