Cheap flights from Philadelphia to St. Augustine (PHL - UST)
PHL — UST
Apr 27 — May 41
Round-trip
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 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 March 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Compare providers for flights from Philadelphia 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 Philadelphia to St. Augustine in March.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Philadelphia-St. Augustine flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-St. Augustine flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Philadelphia-St. Augustine flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Philadelphia-St. Augustine flights, Cheapflights users trust FlightHub the most. FlightHub 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 Philadelphia-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 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.
PHL-UST
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 Philadelphia to St. Augustine
Prices
Delays
What is the cheapest month to book a flight from Philadelphia to St. Augustine?
Currently, September is the cheapest month in which you can book a flight from Philadelphia to St. Augustine (average of $43). Flying from Philadelphia to St. Augustine in March is currently the most expensive (average of $79). 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 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 March 28, 2026.
Unlike in the afternoon, when flights are generally more expensive, you can save up to 40% on flights from Philadelphia to St. Augustine by exploring options for tickets in the evening.
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.
How often are flights from Philadelphia to St. Augustine delayed?
About 19% of weekly flights between Philadelphia and St. Augustine have experienced delays in the past year, with the average delay time being 146 minutes.
What is the most punctual flight time for Philadelphia to St. Augustine flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Wednesday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Philadelphia to St. Augustine flights?
Over the last year, Southwest have had the lowest number of delays on this route, with just 15% of flights being delayed.
Reviews of airlines servicing St. Augustine
Get insights into the airlines that provide service to St. Augustine. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Augustine. Reviews last updated March 28, 2026.
Read reviews from past customers who have flown Frontier from Philadelphia to St. Augustine. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
6.6
Food
4.5
Entertainment
4.3
Boarding
5.9
Comfort
5.4
Overall
5.7
Reviews
1 / 20
2.0
MediocreAnonymous,Mar 2026
MCO - MSP
Crew
6.6
Food
4.5
Entertainment
4.3
Boarding
5.9
Comfort
5.4
Overall
5.7
Reviews
1 / 20
2.0
MediocreAnonymous,Mar 2026
MCO - MSP
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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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 March 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$103 | Average$180 | FlexibilityNo cancel fee | On-time62% |