Cheap flights from Ontario to St. Augustine (ONT - UST)
Find cheap flights from Ontario 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.Find flight deals from Ontario to St. Augustine
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) 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 December 31, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Compare providers for flights from Ontario 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 Ontario to St. Augustine in December.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-St. Augustine flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-St. Augustine flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ontario-St. Augustine flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-St. Augustine flights, Cheapflights users trust eDreams the most. eDreams 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 Ontario-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 Ontario to St. Augustine
Have a flexible travel schedule? Discover the best time to fly to St. Augustine from Ontario with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Ontario to St. Augustine
What is the cheapest month to book a flight from Ontario to St. Augustine?
Currently, December is the cheapest month in which you can book a flight from Ontario to St. Augustine (average of $69). Flying from Ontario to St. Augustine in November is currently the most expensive (average of $164). 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 ONT to UST?
It’s typically best to fly out from Ontario to St. Augustine in the evening. Doing so could potentially save you 69% on the flight price compared to flying at noon, which is usually more expensive.
How often are flights from Ontario to St. Augustine delayed?
About 14% of weekly flights between Ontario and St. Augustine have experienced delays in the past year, with the average delay time being 142 minutes.
What is the most punctual flight time for Ontario to St. Augustine flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Friday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Ontario to St. Augustine flights?
Over the last year, United Airlines have had the lowest number of delays on this route, with just 8% of flights being delayed.