Cheap flights from St. Augustine (UST) to Phoenix
Find cheap flights from St. Augustine to Phoenix with Cheapflights
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.Best time to book a flight from St. Augustine to Phoenix
Have a flexible travel schedule? Discover the best time to fly to Phoenix from St. Augustine with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from St. Augustine to Phoenix
What is the cheapest month to book a flight from St. Augustine to Phoenix?
Currently, January is the cheapest month in which you can book a flight from St. Augustine to Phoenix (average of $258). Flying from St. Augustine to Phoenix in March is currently the most expensive (average of $337). 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 UST to PHX?
Find hourly flight availability from St. Augustine to Phoenix. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.
It’s optimal to fly from St. Augustine to Phoenix at noon. By choosing this option you can save up to 24% on the cost of your flight, compared to a flight in the morning.
What is the cheapest day to fly from St. Augustine to Phoenix?
Use this chart to determine the cheapest time to fly round-trip from St. Augustine to Phoenix. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their St. Augustine to Phoenix flight should consider departing on Thursday at noon when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.