Cheap flights from Philadelphia to St. Augustine (PHL - UST)
PHL — UST
Oct 29 — Nov 51
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.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 September 29, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Popular in | June |
Cheapest in | January |
Average price | $178 |
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | 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.
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
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 September 29, 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.
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 September 29, 2025.
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.
Comfort
5.5
Crew
6.7
Entertainment
4.4
Overall
5.8
Food
4.7
Boarding
6.1
Reviews
1 / 20
2.0
MediocreShawn,Sep 2025
SAN - SFO
Comfort
5.5
Crew
6.7
Entertainment
4.4
Overall
5.8
Food
4.7
Boarding
6.1
Reviews
1 / 20
2.0
MediocreShawn,Sep 2025
SAN - SFO
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 September 29, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$68 | Average$168 | FlexibilityNo cancel fee | On-time62% |