Enjoy free snacks and non-alcoholic drinks, plus a free drink on special occasions.
Southwest offers two free checked bags, including oversized items like skis or golf clubs.
Cheap flights from Philadelphia to St. Augustine (PHL - UST)
PHL — UST
Aug 5 — Aug 121
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 Philadelphia to St. Augustine
Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) 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 31, 2025.
Popular in | June |
|---|---|
Cheapest in | July |
Average price | $168 |
The best insider tips for Philadelphia to St. Augustine flights
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Cheapflights partnered with top experts to bring you the best recommendations for your Philadelphia to St. Augustine trip
Airlines
![Southwest]()
Southwest
![Spirit Airlines]()
Spirit Airlines
Spirit's Big Front Seats offer 11 inches more legroom and larger tray tables for laptops.
Spirit's Saver$ Club offers rotating deals and discounts on luggage and seats.
Our travel experts
Best time to book a flight from Philadelphia to St. Augustine
Have a flexible travel schedule? Discover the best time to fly to St. Augustine from Philadelphia 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.
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Everything you need to know about your flight from Philadelphia to St. Augustine
What is the cheapest time of day to fly from PHL to UST?
Find hourly flight availability from Philadelphia 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 31, 2025.
Unlike at noon, when flights are generally more expensive, you can save up to 41% on flights from Philadelphia to St. Augustine by exploring options for tickets in the afternoon.
What is the cheapest day to fly from Philadelphia to St. Augustine?
Use this chart to determine the cheapest time to fly round-trip from Philadelphia to St. Augustine. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their Philadelphia to St. Augustine flight should consider departing on Sunday at noon 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 Philadelphia 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 Philadelphia to St. Augustine
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Top airline flying from Philadelphia to St. Augustine
Discover the top airline that operate flights from Philadelphia 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 31, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$68 | Average$168 | FlexibilityNo cancel fee | On-time62% |