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Key Largo

Cheap flights from St. Augustine (UST) to Key Largo, FL

UST — MIA
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Everything you need to know about your flight from St. Augustine to Key Largo

What is the cheapest month to book a flight from St. Augustine to Key Largo?

Currently, September is the cheapest month in which you can book a flight from St. Augustine to Key Largo (average of $232). Flying from St. Augustine to Key Largo in March is currently the most expensive (average of $289). 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 UST to KE9?

Find hourly flight availability from St. Augustine to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2025.

When flying from St. Augustine to Key Largo, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from St. Augustine to Key Largo?

Use this chart to determine the cheapest time to fly round-trip from St. Augustine to Key Largo. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their St. Augustine to Key Largo flight should consider departing on Friday evenings when fares are most often at their lowest. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from St. Augustine to Key Largo. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Augustine to Key Largo?

    St. Augustine Northeast Florida Regional (UST) is the airport you will fly out of if you book a flight from St. Augustine to Key Largo. You should not have trouble finding flights to Key Largo from Northeast Florida Regional; the airport handles an average of 0 outbound flights to Key Largo per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the St. Augustine airport to Key Largo. It is only a 4.7 mi journey to Northeast Florida Regional (UST) from St. Augustine’s city center.

  • Can I find deals for flights from St. Augustine to Key Largo that include hotel bookings?

    Yes. In addition to deals on St. Augustine to Key Largo flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Augustine to Key Largo?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Augustine to Key Largo.

  • Can I find deals for business class flights from St. Augustine to Key Largo?

    Yes. Cheapflights offers flight deals from St. Augustine to Key Largo by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Augustine to Key Largo?

    Currently, September is the cheapest month in which you can book a flight from St. Augustine to Key Largo (average of $232). Flying from St. Augustine to Key Largo in March is currently the most expensive (average of $289). 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.

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