Cheap flights from Dulles Intl (IAD) to St. Augustine (UST)
Find cheap flights from Dulles Intl to St. Augustine 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 Dulles Intl to St. Augustine
Have a flexible travel schedule? Discover the best time to fly to St. Augustine from Dulles Intl with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to St. Augustine
What is the cheapest time of day to fly from IAD to UST?
Find hourly flight availability from Dulles Intl 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 June 12, 2025.
It’s optimal to fly from Washington, D.C. Dulles Intl Airport to St. Augustine in the evening. By choosing this option you can save up to 47% on the cost of your flight, compared to a flight in the afternoon.
What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to St. Augustine?
Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to St. Augustine. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to St. Augustine flight should consider departing on Sunday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Rainfall in St. Augustine by month
Plan your trip to St. Augustine by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in St. Augustine ranges from 2.0 - 6.7 inches per month. September is typically the wettest month, when rainfall can reach 6.7 in. November is typically the driest time to visit St. Augustine when rainfall is around 2.0 in.
Temperature in St. Augustine by month
Plan your trip to St. Augustine by taking into account the average temperature totals by month.
If weather is an important factor for your trip to St. Augustine, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 57.2 F).