Cheap flights from St. Louis to St. Augustine (STL - UST)
STL — UST
Jan 11 — Jan 181
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Find flight deals from St. Louis to St. Augustine
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to St. Augustine (UST). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 12, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Compare providers for flights from St. Louis to St. Augustine
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to St. Augustine in December.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-St. Augustine flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-St. Augustine flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-St. Augustine flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-St. Augustine flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-St. Augustine flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to St. Augustine
Have a flexible travel schedule? Discover the best time to fly to St. Augustine from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to St. Augustine
What is the cheapest month to book a flight from St. Louis to St. Augustine?
Currently, January is the cheapest month in which you can book a flight from St. Louis to St. Augustine (average of $48). Flying from St. Louis to St. Augustine in September is currently the most expensive (average of $118). 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 STL to UST?
Find hourly flight availability from St. Louis to St. Augustine. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 12, 2025.
It’s optimal to fly from St. Louis to St. Augustine at noon. By choosing this option you can save up to 25% on the cost of your flight, compared to a flight in the morning.
What is the cheapest day to fly from St. Louis to St. Augustine?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to St. Augustine. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their St. Louis to St. Augustine flight should consider departing on Monday afternoons when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.