Enjoy free snacks and non-alcoholic drinks, plus a free drink on special occasions.
Two free checked bags included, ideal for travelers with oversized items like skis or golf clubs.
Cheap flights from Boston to St. Augustine (BOS - UST)
BOS — UST
Aug 4 — Aug 111
1 adult, Economy
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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 Boston to St. Augustine
Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) 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 July 30, 2025.
Popular in | July |
|---|---|
Cheapest in | November |
Average price | $517 |
The best insider tips for Boston to St. Augustine flights
Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Boston to St. Augustine trip
Airlines
![Southwest]()
Southwest
![Spirit Airlines]()
Spirit Airlines
Consider Big Front Seats for wider seats and 11 inches more legroom, perfect for comfort seekers.
Use Spirit Bag-O-Tron to compare baggage fees and save money on your luggage costs.
Our travel experts
Best time to book a flight from Boston to St. Augustine
Have a flexible travel schedule? Discover the best time to fly to St. Augustine from Boston 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 Boston to St. Augustine
What is the cheapest time of day to fly from BOS to UST?
Find hourly flight availability from Boston 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 July 30, 2025.
A simple way to save on the total cost of your ticket is to fly from Boston to St. Augustine in the afternoon. If you’re flexible enough to do this you can expect to save up to 45% on your trip compared to booking a flight at noon.
What is the cheapest day to fly from Boston to St. Augustine?
Use this chart to determine the cheapest time to fly round-trip from Boston to St. Augustine. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their Boston to St. Augustine flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday afternoons 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 Boston to St. Augustine. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Augustine?
Book flights to St. Augustine if you plan to visit one of these locationsVilano Beach
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Alternative routes for Boston to St. Augustine
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Top airline flying from Boston to St. Augustine
Discover the top airline that operate flights from Boston to St. Augustine. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 30, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$157 | Average$237 | FlexibilityNo cancel fee | On-time62% |