Cheap flights from Key Largo, FL to St. Augustine (UST)
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Key Largo to St. Augustine
Keep the following information in mind while searching for Key Largo to St. Augustine flight deals. Data was last updated November 2, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Cheapflights Insights
Everything you need to know about your flight from Key Largo to St. Augustine
What is the cheapest month to book a flight from Key Largo to St. Augustine?
Currently, April is the cheapest month in which you can book a flight from Key Largo to St. Augustine (average of $23). Flying from Key Largo to St. Augustine in June is currently the most expensive (average of $73). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from KE9 to UST?
It’s typically best to fly out from Key Largo to St. Augustine in the afternoon. Doing so could potentially save you 5% on the flight price compared to flying in the evening, which is usually more expensive.
What is the cheapest day to fly from Key Largo to St. Augustine?
Travelers seeking maximum savings on their Key Largo to St. Augustine flight should consider departing on Wednesday evenings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.