PHL - UST

Find cheap flights from Philadelphia to St. Augustine

1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to St. Augustine

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to St. Augustine, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to St. Augustine, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Philadelphia to St. Augustine (PHL-UST)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to St. Augustine that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to St. Augustine

Multiple Airlines Logo
PHL-UST
767 mimulti-stop
Multiple Airlines Logo
UST-PHL
767 mimulti-stop
Multiple Airlines
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Everything you should know

Cheapest round-trip
Multiple Airlines
Tue 9/9
PHL - UST • multi-stop
Cheapest one-way
Multiple Airlines
Tue 9/9
PHL - UST • multi-stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Augustine!
Booking Insights

KAYAK's insights & trends for Philadelphia to St. Augustine flights

Get data-powered insights and trends into flights from Philadelphia to St. Augustine to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Philadelphia to St. Augustine?

The average price of all round-trip flights from Philadelphia to St. Augustine clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Philadelphia to St. Augustine, look for departures on Saturdays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from St. Augustine, Thursday is the cheapest day to fly and Monday is the most expensive.

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Good to know

Most popular time to fly and prices are also 20% lower on average.

When to book flights from Philadelphia to St. Augustine

Are your dates flexible? Find out the best times to travel from Philadelphia to St. Augustine based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Philadelphia to St. Augustine

  • Do I need a passport to fly between Philadelphia and St. Augustine?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which aircraft models fly most regularly from Philadelphia to St. Augustine?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Philadelphia to St. Augustine?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to St. Augustine.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia to St. Augustine?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Augustine from Philadelphia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Philadelphia to St. Augustine?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Augustine with an airline and back to Philadelphia with another airline. Booking your flights between Philadelphia and UST can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Philadelphia to St. Augustine?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Augustine from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Philadelphia to St. Augustine

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to St. Augustine. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to St. Augustine? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
5.8
FrontierOverall score based on 3185 reviews
6.1Boarding
5.5Comfort
4.7Food
6.7Crew
4.4Entertainment
Airline reviews

sluggish boarding and arrival procedures, fake nice flight attendants, and lots of delays.

2.0 MediocreJeremy, Aug 2025PHL - ATL
Read more Frontier reviews

sluggish boarding and arrival procedures, fake nice flight attendants, and lots of delays.

I was 2 hr arrive in the airport and 45 min in the line . After take to my turn . The agent tell me I’m later . I can not board . So my vacation was going to the floor . Just for their bad customer service agent in the airline

2 hour delay due to late plane, wrong size plane causing overbooking, and people getting off and on the plane after boarding was completed.

Since you have to pay for overhead bags then they shouldn't be running out of space and asking individuals who paid to remove stuff from the overhead

Book with frontier airlines with the mentality that they'll cancel your flight, kick you off and lose your luggage. Anything besides that is a win. Compare prices with other airlines (to include luggage) and if frontier is still worth it, book it but know all of their policies.

You get what you pay for nothing essentially but a hard uncomfortable seat that doesn’t recline and kids screaming all around you and chaotic boarding and limited check bag weight allowance when compared to other airlines

Not very good. Paid in excess of $400 for assigned seating for my family and that was not provided. I want that money back.

I chose the seats when booked the flight and paid for them. However after checking in I found we were assigned different seats!

It was a no frills flight. Would have liked to be able to charge my device

Seats were extremely uncomfortable and it was very hot on the plane.

Everything you need to know for your flight from Philadelphia to St. Augustine

Information on your arrival and departure airports

Philadelphia (PHL)
St. Augustine (UST)

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