Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Augustine to Mexico City as you normally would.
UST stands for St. Augustine Northeast Florida Regional Airport, while MEX stands for Mexico City Benito Juarez Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.
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